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python/examples/pylammps/elastic/Au.data
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python/examples/pylammps/elastic/Au.data
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#Generated by cif2cell 1.2.10 from COD reference: 9008463. : Wyckoff, R. W. G., Crystal Structures 1, 7-83 (1963).
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500 atoms
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1 atom types
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0.0 20.391250 xlo xhi
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0.0 20.391250 ylo yhi
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0.0 20.391250 zlo zhi
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Masses
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1 100
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Atoms
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1 1 0.000000000000000 0.000000000000000 0.000000000000000
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2 1 0.000000000000000 2.039125000000000 2.039125000000000
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3 1 2.039125000000000 0.000000000000000 2.039125000000000
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4 1 2.039125000000000 2.039125000000000 0.000000000000000
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5 1 8.156499999999999 16.312999999999995 0.000000000000000
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6 1 12.234750000000002 4.078249999999999 0.000000000000000
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7 1 12.234750000000002 12.234750000000002 12.234750000000002
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8 1 0.000000000000000 0.000000000000000 12.234750000000002
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9 1 8.156499999999999 12.234750000000002 8.156499999999998
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10 1 8.156499999999999 4.078249999999999 0.000000000000000
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11 1 16.312999999999999 0.000000000000000 12.234750000000002
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13 1 8.156499999999999 0.000000000000000 8.156499999999998
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14 1 16.312999999999999 16.312999999999995 8.156499999999998
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15 1 4.078250000000000 4.078249999999999 0.000000000000000
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16 1 16.312999999999999 8.156499999999998 0.000000000000000
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17 1 12.234750000000002 4.078249999999999 4.078249999999999
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29 1 12.234750000000002 16.312999999999995 12.234750000000002
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30 1 12.234750000000002 0.000000000000000 4.078249999999999
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31 1 4.078250000000000 16.312999999999995 8.156499999999998
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32 1 12.234750000000002 4.078249999999999 12.234750000000002
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33 1 4.078250000000000 8.156499999999998 0.000000000000000
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34 1 16.312999999999999 12.234750000000002 0.000000000000000
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35 1 8.156499999999999 0.000000000000000 16.312999999999995
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36 1 8.156499999999999 8.156499999999998 4.078249999999999
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37 1 16.312999999999999 12.234750000000002 12.234750000000002
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38 1 4.078250000000000 0.000000000000000 4.078249999999999
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39 1 12.234750000000002 4.078249999999999 16.312999999999995
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40 1 16.312999999999999 4.078249999999999 4.078249999999999
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41 1 0.000000000000000 8.156499999999998 12.234750000000002
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42 1 16.312999999999999 4.078249999999999 16.312999999999995
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43 1 0.000000000000000 0.000000000000000 4.078249999999999
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44 1 8.156499999999999 8.156499999999998 8.156499999999998
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45 1 8.156499999999999 12.234750000000002 0.000000000000000
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46 1 0.000000000000000 0.000000000000000 16.312999999999995
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47 1 8.156499999999999 12.234750000000002 12.234750000000002
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48 1 8.156499999999999 4.078249999999999 4.078249999999999
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49 1 4.078250000000000 12.234750000000002 0.000000000000000
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50 1 12.234750000000002 8.156499999999998 4.078249999999999
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51 1 16.312999999999999 16.312999999999995 0.000000000000000
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52 1 8.156499999999999 8.156499999999998 12.234750000000002
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53 1 8.156499999999999 4.078249999999999 16.312999999999995
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54 1 16.312999999999999 16.312999999999995 12.234750000000002
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55 1 12.234750000000002 16.312999999999995 4.078249999999999
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56 1 4.078250000000000 4.078249999999999 4.078249999999999
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57 1 16.312999999999999 8.156499999999998 4.078249999999999
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58 1 8.156499999999999 4.078249999999999 8.156499999999998
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59 1 8.156499999999999 8.156499999999998 16.312999999999995
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60 1 4.078250000000000 4.078249999999999 16.312999999999995
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61 1 0.000000000000000 16.312999999999995 4.078249999999999
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62 1 16.312999999999999 8.156499999999998 16.312999999999995
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63 1 0.000000000000000 4.078249999999999 4.078249999999999
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64 1 16.312999999999999 0.000000000000000 8.156499999999998
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65 1 8.156499999999999 0.000000000000000 4.078249999999999
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66 1 8.156499999999999 4.078249999999999 12.234750000000002
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67 1 0.000000000000000 4.078249999999999 16.312999999999995
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68 1 8.156499999999999 16.312999999999995 12.234750000000002
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69 1 4.078250000000000 16.312999999999995 0.000000000000000
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70 1 4.078250000000000 8.156499999999998 4.078249999999999
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71 1 4.078250000000000 16.312999999999995 12.234750000000002
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72 1 4.078250000000000 12.234750000000002 12.234750000000002
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73 1 0.000000000000000 16.312999999999995 0.000000000000000
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74 1 16.312999999999999 12.234750000000002 4.078249999999999
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75 1 12.234750000000002 0.000000000000000 16.312999999999995
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76 1 4.078250000000000 8.156499999999998 16.312999999999995
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77 1 4.078250000000000 8.156499999999998 8.156499999999998
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78 1 16.312999999999999 12.234750000000002 16.312999999999995
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79 1 0.000000000000000 8.156499999999998 4.078249999999999
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80 1 16.312999999999999 4.078249999999999 8.156499999999998
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81 1 0.000000000000000 8.156499999999998 16.312999999999995
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82 1 0.000000000000000 12.234750000000002 0.000000000000000
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83 1 12.234750000000002 0.000000000000000 12.234750000000002
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84 1 12.234750000000002 12.234750000000002 16.312999999999995
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85 1 0.000000000000000 0.000000000000000 8.156499999999998
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86 1 4.078250000000000 8.156499999999998 12.234750000000002
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87 1 8.156499999999999 12.234750000000002 4.078249999999999
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88 1 12.234750000000002 16.312999999999995 0.000000000000000
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89 1 8.156499999999999 12.234750000000002 16.312999999999995
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90 1 0.000000000000000 12.234750000000002 4.078249999999999
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91 1 4.078250000000000 12.234750000000002 4.078249999999999
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92 1 12.234750000000002 0.000000000000000 8.156499999999998
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93 1 16.312999999999999 16.312999999999995 4.078249999999999
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94 1 0.000000000000000 16.312999999999995 12.234750000000002
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95 1 4.078250000000000 12.234750000000002 16.312999999999995
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96 1 16.312999999999999 16.312999999999995 16.312999999999995
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99 1 4.078250000000000 4.078249999999999 8.156499999999998
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100 1 16.312999999999999 8.156499999999998 8.156499999999998
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101 1 4.078250000000000 4.078249999999999 12.234750000000002
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102 1 16.312999999999999 0.000000000000000 0.000000000000000
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103 1 0.000000000000000 12.234750000000002 16.312999999999995
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104 1 12.234750000000002 16.312999999999995 16.312999999999995
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105 1 12.234750000000002 12.234750000000002 0.000000000000000
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106 1 0.000000000000000 4.078249999999999 8.156499999999998
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107 1 8.156499999999999 16.312999999999995 4.078249999999999
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108 1 4.078250000000000 0.000000000000000 8.156499999999998
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109 1 12.234750000000002 0.000000000000000 0.000000000000000
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110 1 0.000000000000000 12.234750000000002 12.234750000000002
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111 1 0.000000000000000 16.312999999999995 8.156499999999998
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112 1 8.156499999999999 16.312999999999995 16.312999999999995
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113 1 12.234750000000002 8.156499999999998 12.234750000000002
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114 1 4.078250000000000 16.312999999999995 4.078249999999999
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115 1 12.234750000000002 12.234750000000002 4.078249999999999
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116 1 8.156499999999999 0.000000000000000 0.000000000000000
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117 1 0.000000000000000 8.156499999999998 8.156499999999998
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118 1 4.078250000000000 16.312999999999995 16.312999999999995
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119 1 8.156499999999999 0.000000000000000 12.234750000000002
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120 1 12.234750000000002 8.156499999999998 0.000000000000000
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121 1 16.312999999999999 12.234750000000002 8.156499999999998
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122 1 4.078250000000000 0.000000000000000 0.000000000000000
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123 1 12.234750000000002 12.234750000000002 8.156499999999998
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124 1 16.312999999999999 4.078249999999999 0.000000000000000
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125 1 0.000000000000000 16.312999999999995 16.312999999999995
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126 1 4.078250000000000 0.000000000000000 16.312999999999995
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127 1 4.078250000000000 0.000000000000000 12.234750000000002
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128 1 16.312999999999999 4.078249999999999 12.234750000000002
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129 1 8.156499999999999 18.352124999999997 2.039125000000000
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132 1 0.000000000000000 2.039125000000000 14.273875000000000
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134 1 8.156499999999999 6.117374999999998 2.039125000000000
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135 1 16.312999999999999 2.039125000000000 14.273875000000000
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136 1 4.078250000000000 14.273875000000000 10.195625000000000
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137 1 8.156499999999999 2.039125000000000 10.195625000000000
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139 1 4.078250000000000 6.117374999999998 2.039125000000000
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140 1 16.312999999999999 10.195625000000000 2.039125000000000
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141 1 12.234750000000002 6.117374999999998 6.117374999999998
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142 1 16.312999999999999 2.039125000000000 18.352124999999997
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143 1 0.000000000000000 14.273875000000000 10.195625000000000
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144 1 16.312999999999999 10.195625000000000 14.273875000000000
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145 1 0.000000000000000 6.117374999999998 2.039125000000000
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146 1 16.312999999999999 2.039125000000000 6.117374999999998
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147 1 12.234750000000002 18.352124999999997 10.195625000000000
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148 1 12.234750000000002 6.117374999999998 10.195625000000000
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149 1 0.000000000000000 6.117374999999998 14.273875000000000
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150 1 8.156499999999999 18.352124999999997 10.195625000000000
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151 1 12.234750000000002 10.195625000000000 18.352124999999997
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152 1 8.156499999999999 10.195625000000000 2.039125000000000
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153 1 12.234750000000002 18.352124999999997 14.273875000000000
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154 1 12.234750000000002 2.039125000000000 6.117374999999998
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155 1 4.078250000000000 18.352124999999997 10.195625000000000
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156 1 12.234750000000002 6.117374999999998 14.273875000000000
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157 1 4.078250000000000 10.195625000000000 2.039125000000000
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158 1 16.312999999999999 14.273875000000000 2.039125000000000
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159 1 8.156499999999999 2.039125000000000 18.352124999999997
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160 1 8.156499999999999 10.195625000000000 6.117374999999998
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161 1 16.312999999999999 14.273875000000000 14.273875000000000
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162 1 4.078250000000000 2.039125000000000 6.117374999999998
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163 1 12.234750000000002 6.117374999999998 18.352124999999997
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164 1 16.312999999999999 6.117374999999998 6.117374999999998
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165 1 0.000000000000000 10.195625000000000 14.273875000000000
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166 1 16.312999999999999 6.117374999999998 18.352124999999997
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167 1 0.000000000000000 2.039125000000000 6.117374999999998
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168 1 8.156499999999999 10.195625000000000 10.195625000000000
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169 1 8.156499999999999 14.273875000000000 2.039125000000000
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170 1 0.000000000000000 2.039125000000000 18.352124999999997
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171 1 8.156499999999999 14.273875000000000 14.273875000000000
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172 1 8.156499999999999 6.117374999999998 6.117374999999998
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173 1 4.078250000000000 14.273875000000000 2.039125000000000
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174 1 12.234750000000002 10.195625000000000 6.117374999999998
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175 1 16.312999999999999 18.352124999999997 2.039125000000000
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176 1 8.156499999999999 10.195625000000000 14.273875000000000
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177 1 8.156499999999999 6.117374999999998 18.352124999999997
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178 1 16.312999999999999 18.352124999999997 14.273875000000000
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179 1 12.234750000000002 18.352124999999997 6.117374999999998
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180 1 4.078250000000000 6.117374999999998 6.117374999999998
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181 1 16.312999999999999 10.195625000000000 6.117374999999998
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182 1 8.156499999999999 6.117374999999998 10.195625000000000
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183 1 8.156499999999999 10.195625000000000 18.352124999999997
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184 1 4.078250000000000 6.117374999999998 18.352124999999997
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185 1 0.000000000000000 18.352124999999997 6.117374999999998
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186 1 16.312999999999999 10.195625000000000 18.352124999999997
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187 1 0.000000000000000 6.117374999999998 6.117374999999998
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188 1 16.312999999999999 2.039125000000000 10.195625000000000
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189 1 8.156499999999999 2.039125000000000 6.117374999999998
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190 1 8.156499999999999 6.117374999999998 14.273875000000000
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191 1 0.000000000000000 6.117374999999998 18.352124999999997
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192 1 8.156499999999999 18.352124999999997 14.273875000000000
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193 1 4.078250000000000 18.352124999999997 2.039125000000000
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194 1 4.078250000000000 10.195625000000000 6.117374999999998
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195 1 4.078250000000000 18.352124999999997 14.273875000000000
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196 1 4.078250000000000 14.273875000000000 14.273875000000000
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197 1 0.000000000000000 18.352124999999997 2.039125000000000
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198 1 16.312999999999999 14.273875000000000 6.117374999999998
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199 1 12.234750000000002 2.039125000000000 18.352124999999997
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200 1 4.078250000000000 10.195625000000000 18.352124999999997
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201 1 4.078250000000000 10.195625000000000 10.195625000000000
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202 1 16.312999999999999 14.273875000000000 18.352124999999997
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203 1 0.000000000000000 10.195625000000000 6.117374999999998
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204 1 16.312999999999999 6.117374999999998 10.195625000000000
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205 1 0.000000000000000 10.195625000000000 18.352124999999997
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206 1 0.000000000000000 14.273875000000000 2.039125000000000
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207 1 12.234750000000002 2.039125000000000 14.273875000000000
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208 1 12.234750000000002 14.273875000000000 18.352124999999997
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209 1 0.000000000000000 2.039125000000000 10.195625000000000
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210 1 4.078250000000000 10.195625000000000 14.273875000000000
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211 1 8.156499999999999 14.273875000000000 6.117374999999998
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212 1 12.234750000000002 18.352124999999997 2.039125000000000
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213 1 8.156499999999999 14.273875000000000 18.352124999999997
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214 1 0.000000000000000 14.273875000000000 6.117374999999998
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215 1 4.078250000000000 14.273875000000000 6.117374999999998
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216 1 12.234750000000002 2.039125000000000 10.195625000000000
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217 1 16.312999999999999 18.352124999999997 6.117374999999998
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218 1 0.000000000000000 18.352124999999997 14.273875000000000
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219 1 4.078250000000000 14.273875000000000 18.352124999999997
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220 1 16.312999999999999 18.352124999999997 18.352124999999997
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221 1 0.000000000000000 10.195625000000000 2.039125000000000
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222 1 12.234750000000002 10.195625000000000 10.195625000000000
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223 1 4.078250000000000 6.117374999999998 10.195625000000000
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224 1 16.312999999999999 10.195625000000000 10.195625000000000
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225 1 4.078250000000000 6.117374999999998 14.273875000000000
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226 1 16.312999999999999 2.039125000000000 2.039125000000000
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227 1 0.000000000000000 14.273875000000000 18.352124999999997
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228 1 12.234750000000002 18.352124999999997 18.352124999999997
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229 1 12.234750000000002 14.273875000000000 2.039125000000000
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230 1 0.000000000000000 6.117374999999998 10.195625000000000
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231 1 8.156499999999999 18.352124999999997 6.117374999999998
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232 1 4.078250000000000 2.039125000000000 10.195625000000000
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233 1 12.234750000000002 2.039125000000000 2.039125000000000
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234 1 0.000000000000000 14.273875000000000 14.273875000000000
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235 1 0.000000000000000 18.352124999999997 10.195625000000000
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236 1 8.156499999999999 18.352124999999997 18.352124999999997
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237 1 12.234750000000002 10.195625000000000 14.273875000000000
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238 1 4.078250000000000 18.352124999999997 6.117374999999998
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239 1 12.234750000000002 14.273875000000000 6.117374999999998
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240 1 8.156499999999999 2.039125000000000 2.039125000000000
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241 1 0.000000000000000 10.195625000000000 10.195625000000000
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242 1 4.078250000000000 18.352124999999997 18.352124999999997
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490 1 6.117375000000001 18.352124999999997 16.312999999999995
|
||||||
|
491 1 10.195625000000000 2.039125000000000 12.234750000000002
|
||||||
|
492 1 14.273875000000004 10.195625000000000 0.000000000000000
|
||||||
|
493 1 18.352125000000001 14.273875000000000 8.156499999999998
|
||||||
|
494 1 6.117375000000001 2.039125000000000 0.000000000000000
|
||||||
|
495 1 14.273875000000004 14.273875000000000 8.156499999999998
|
||||||
|
496 1 18.352125000000001 6.117374999999998 0.000000000000000
|
||||||
|
497 1 2.039125000000000 18.352124999999997 16.312999999999995
|
||||||
|
498 1 6.117375000000001 2.039125000000000 16.312999999999995
|
||||||
|
499 1 6.117375000000001 2.039125000000000 12.234750000000002
|
||||||
|
500 1 18.352125000000001 6.117374999999998 12.234750000000002
|
||||||
309
python/examples/pylammps/elastic/elastic.py
Normal file
309
python/examples/pylammps/elastic/elastic.py
Normal file
@ -0,0 +1,309 @@
|
|||||||
|
|
||||||
|
from argparse import ArgumentParser
|
||||||
|
from lammps import PyLammps
|
||||||
|
|
||||||
|
def potential(lmp, args):
|
||||||
|
""" set up potential and minimization """
|
||||||
|
ff_string = ' '
|
||||||
|
ff_string = ff_string.join(args.elements) # merge all element string to one string
|
||||||
|
lmp.kim_interactions(ff_string)
|
||||||
|
|
||||||
|
# Setup neighbor style
|
||||||
|
lmp.neighbor(1.0, "nsq")
|
||||||
|
lmp.neigh_modify("once no every 1 delay 0 check yes")
|
||||||
|
|
||||||
|
# Setup minimization style
|
||||||
|
lmp.min_style(args.min_style)
|
||||||
|
lmp.min_modify("dmax ${dmax} line quadratic")
|
||||||
|
|
||||||
|
# Setup output
|
||||||
|
lmp.thermo(1)
|
||||||
|
lmp.thermo_style("custom step temp pe press pxx pyy pzz pxy pxz pyz lx ly lz")
|
||||||
|
lmp.thermo_modify("norm no")
|
||||||
|
|
||||||
|
return
|
||||||
|
|
||||||
|
def displace(lmp, args, idir):
|
||||||
|
"""computes the response to a small strain """
|
||||||
|
|
||||||
|
if idir == 1:
|
||||||
|
lmp.variable("len0 equal {}".format(lmp.variables["lx0"].value))
|
||||||
|
elif idir == 2 or idir == 6:
|
||||||
|
lmp.variable("len0 equal {}".format(lmp.variables["ly0"].value))
|
||||||
|
else:
|
||||||
|
lmp.variable("len0 equal {}".format(lmp.variables["lz0"].value))
|
||||||
|
|
||||||
|
# Reset box and simulation parameters
|
||||||
|
lmp.clear()
|
||||||
|
lmp.box("tilt large")
|
||||||
|
lmp.kim_init(args.kim_model, "metal", "unit_conversion_mode")
|
||||||
|
lmp.read_restart("restart.equil")
|
||||||
|
lmp.change_box("all triclinic")
|
||||||
|
potential(lmp, args)
|
||||||
|
|
||||||
|
# Negative deformation
|
||||||
|
lmp.variable("delta equal -${up}*${len0}")
|
||||||
|
lmp.variable("deltaxy equal -${up}*xy")
|
||||||
|
lmp.variable("deltaxz equal -${up}*xz")
|
||||||
|
lmp.variable("deltayz equal -${up}*yz")
|
||||||
|
|
||||||
|
if idir == 1:
|
||||||
|
lmp.change_box("all x delta 0 ${delta} xy delta ${deltaxy} xz delta ${deltaxz} remap units box")
|
||||||
|
elif idir == 2:
|
||||||
|
lmp.change_box("all y delta 0 ${delta} yz delta ${deltayz} remap units box")
|
||||||
|
elif idir == 3:
|
||||||
|
lmp.change_box("all z delta 0 ${delta} remap units box")
|
||||||
|
elif idir == 4:
|
||||||
|
lmp.change_box("all yz delta ${delta} remap units box")
|
||||||
|
elif idir == 5:
|
||||||
|
lmp.change_box("all xz delta ${delta} remap units box")
|
||||||
|
else:
|
||||||
|
lmp.change_box("all xy delta ${delta} remap units box")
|
||||||
|
|
||||||
|
# Relax atoms positions
|
||||||
|
lmp.min_style(args.min_style)
|
||||||
|
lmp.minimize(args.minimize[0], args.minimize[1], int(args.minimize[2]), int(args.minimize[3]))
|
||||||
|
|
||||||
|
# Obtain new stress tensor
|
||||||
|
lmp.variable("pxx1 equal {}".format(lmp.eval("pxx")))
|
||||||
|
lmp.variable("pyy1 equal {}".format(lmp.eval("pyy")))
|
||||||
|
lmp.variable("pzz1 equal {}".format(lmp.eval("pzz")))
|
||||||
|
lmp.variable("pxy1 equal {}".format(lmp.eval("pxy")))
|
||||||
|
lmp.variable("pxz1 equal {}".format(lmp.eval("pxz")))
|
||||||
|
lmp.variable("pyz1 equal {}".format(lmp.eval("pyz")))
|
||||||
|
|
||||||
|
# Compute elastic constant from pressure tensor
|
||||||
|
c1neg = lmp.variables["d1"].value
|
||||||
|
c2neg = lmp.variables["d2"].value
|
||||||
|
c3neg = lmp.variables["d3"].value
|
||||||
|
c4neg = lmp.variables["d4"].value
|
||||||
|
c5neg = lmp.variables["d5"].value
|
||||||
|
c6neg = lmp.variables["d6"].value
|
||||||
|
|
||||||
|
# Reset box and simulation parameters
|
||||||
|
lmp.clear()
|
||||||
|
lmp.box("tilt large")
|
||||||
|
lmp.kim_init(args.kim_model, "metal", "unit_conversion_mode")
|
||||||
|
lmp.read_restart("restart.equil")
|
||||||
|
lmp.change_box("all triclinic")
|
||||||
|
potential(lmp, args)
|
||||||
|
|
||||||
|
# Positive deformation
|
||||||
|
lmp.variable("delta equal ${up}*${len0}")
|
||||||
|
lmp.variable("deltaxy equal ${up}*xy")
|
||||||
|
lmp.variable("deltaxz equal ${up}*xz")
|
||||||
|
lmp.variable("deltayz equal ${up}*yz")
|
||||||
|
|
||||||
|
if idir == 1:
|
||||||
|
lmp.change_box("all x delta 0 ${delta} xy delta ${deltaxy} xz delta ${deltaxz} remap units box")
|
||||||
|
elif idir == 2:
|
||||||
|
lmp.change_box("all y delta 0 ${delta} yz delta ${deltayz} remap units box")
|
||||||
|
elif idir == 3:
|
||||||
|
lmp.change_box("all z delta 0 ${delta} remap units box")
|
||||||
|
elif idir == 4:
|
||||||
|
lmp.change_box("all yz delta ${delta} remap units box")
|
||||||
|
elif idir == 5:
|
||||||
|
lmp.change_box("all xz delta ${delta} remap units box")
|
||||||
|
else:
|
||||||
|
lmp.change_box("all xy delta ${delta} remap units box")
|
||||||
|
|
||||||
|
# Relax atoms positions
|
||||||
|
lmp.min_style(args.min_style)
|
||||||
|
lmp.minimize(args.minimize[0], args.minimize[1], int(args.minimize[2]), int(args.minimize[3]))
|
||||||
|
|
||||||
|
# Obtain new stress tensor
|
||||||
|
lmp.variable("pxx1 equal {}".format(lmp.eval("pxx")))
|
||||||
|
lmp.variable("pyy1 equal {}".format(lmp.eval("pyy")))
|
||||||
|
lmp.variable("pzz1 equal {}".format(lmp.eval("pzz")))
|
||||||
|
lmp.variable("pxy1 equal {}".format(lmp.eval("pxy")))
|
||||||
|
lmp.variable("pxz1 equal {}".format(lmp.eval("pxz")))
|
||||||
|
lmp.variable("pyz1 equal {}".format(lmp.eval("pyz")))
|
||||||
|
|
||||||
|
# Compute elasic constant from pressure tensor
|
||||||
|
c1pos = lmp.variables["d1"].value
|
||||||
|
c2pos = lmp.variables["d2"].value
|
||||||
|
c3pos = lmp.variables["d3"].value
|
||||||
|
c4pos = lmp.variables["d4"].value
|
||||||
|
c5pos = lmp.variables["d5"].value
|
||||||
|
c6pos = lmp.variables["d6"].value
|
||||||
|
|
||||||
|
# Combine posiive and negative
|
||||||
|
lmp.variable("C1{} equal {}".format(idir, 0.5*(c1neg+c1pos)))
|
||||||
|
lmp.variable("C2{} equal {}".format(idir, 0.5*(c2neg+c2pos)))
|
||||||
|
lmp.variable("C3{} equal {}".format(idir, 0.5*(c3neg+c3pos)))
|
||||||
|
lmp.variable("C4{} equal {}".format(idir, 0.5*(c4neg+c4pos)))
|
||||||
|
lmp.variable("C5{} equal {}".format(idir, 0.5*(c5neg+c5pos)))
|
||||||
|
lmp.variable("C6{} equal {}".format(idir, 0.5*(c6neg+c6pos)))
|
||||||
|
|
||||||
|
return
|
||||||
|
|
||||||
|
def elastic():
|
||||||
|
""" Compute elastic constant tensor for a crystal
|
||||||
|
|
||||||
|
In order to calculate the elastic constants correctly, care must be taken to specify
|
||||||
|
the correct units (units). It is also important to verify that the minimization of energy
|
||||||
|
w.r.t atom positions in the deformed cell is fully converged.
|
||||||
|
One indication of this is that the elastic constants are insensitive
|
||||||
|
to the choice of the variable ${up}. Another is to check
|
||||||
|
the final max and two-norm forces reported in the log file. If you know
|
||||||
|
that minimization is not required, you can set maxiter = 0.0 """
|
||||||
|
|
||||||
|
parser = ArgumentParser(description='A python script to compute elastic properties of bulk materials')
|
||||||
|
|
||||||
|
parser.add_argument("input_data_file", help="The full path & name of the lammps data file.")
|
||||||
|
parser.add_argument("kim_model", help="the KIM ID of the interatomic model archived in OpenKIM")
|
||||||
|
parser.add_argument("elements", nargs='+', default=['Au'], help="a list of N chemical species, which defines a mapping between atom types in LAMMPS to the available species in the OpenKIM model")
|
||||||
|
parser.add_argument("--min_style", default="cg", help="which algorithm will be used for minimization from lammps")
|
||||||
|
parser.add_argument("--minimize", type=float, nargs=4, default=[1.0e-4, 1.0e-6, 100, 1000], help="minimization parameters")
|
||||||
|
parser.add_argument("--up", type=float, default=1.0e-6, help="the deformation magnitude (in strain units)")
|
||||||
|
args = parser.parse_args()
|
||||||
|
|
||||||
|
L = PyLammps()
|
||||||
|
|
||||||
|
L.units("metal")
|
||||||
|
|
||||||
|
# Define the finite deformation size.
|
||||||
|
#Try several values to verify that results do not depend on it.
|
||||||
|
L.variable("up equal {}".format(args.up))
|
||||||
|
|
||||||
|
# Define the amount of random jiggle for atoms. It prevents atoms from staying on saddle points
|
||||||
|
atomjiggle = 1.0e-5
|
||||||
|
|
||||||
|
# metal units, elastic constants in GPa
|
||||||
|
cfac = 1.0e-4
|
||||||
|
|
||||||
|
# Define minimization parameters
|
||||||
|
L.variable("dmax equal 1.0e-2")
|
||||||
|
|
||||||
|
L.boundary("p", "p", "p") # periodic boundary conditions in all three directions
|
||||||
|
L.box("tilt large") # to avoid termination if the final simulation box has a high tilt factor
|
||||||
|
|
||||||
|
# use the OpenKIM model to set the energy interactions
|
||||||
|
L.kim_init(args.kim_model, "metal", "unit_conversion_mode")
|
||||||
|
|
||||||
|
L.read_data(args.input_data_file)
|
||||||
|
|
||||||
|
potential(L, args)
|
||||||
|
|
||||||
|
# Need to set mass to something, just to satisfy LAMMPS
|
||||||
|
mass_dictionary = {'H': 1.00797, 'He': 4.00260, 'Li': 6.941, 'Be': 9.01218, 'B': 10.81, 'C': 12.011, 'N': 14.0067, 'O': 15.9994, 'F': 18.998403, 'Ne': 20.179, 'Na': 22.98977, 'Mg': 24.305, 'Al': 26.98154, 'Si': 28.0855, 'P': 30.97376, 'S': 32.06, 'Cl': 35.453, 'K': 39.0983, 'Ar': 39.948, 'Ca': 40.08, 'Sc': 44.9559, 'Ti': 47.90, 'V': 50.9415, 'Cr': 51.996, 'Mn': 54.9380, 'Fe': 55.847, 'Ni': 58.70, 'Co': 58.9332, 'Cu': 63.546, 'Zn': 65.38, 'Ga': 69.72, 'Ge': 72.59, 'As': 74.9216, 'Se': 78.96, 'Br': 79.904, 'Kr': 83.80, 'Rb': 85.4678, 'Sr': 87.62, 'Y': 88.9059, 'Zr': 91.22, 'Nb': 92.9064, 'Mo': 95.94, 'Tc': (98), 'Ru': 101.07, 'Rh': 102.9055, 'Pd': 106.4, 'Ag': 107.868, 'Cd': 112.41, 'In': 114.82, 'Sn': 118.69, 'Sb': 121.75, 'I': 126.9045, 'Te': 127.60, 'Xe': 131.30, 'Cs': 132.9054, 'Ba': 137.33, 'La': 138.9055, 'Ce': 140.12, 'Pr': 140.9077, 'Nd': 144.24, 'Pm': (145), 'Sm': 150.4, 'Eu': 151.96, 'Gd': 157.25, 'Tb': 158.9254, 'Dy': 162.50, 'Ho': 164.9304, 'Er': 167.26, 'Tm': 168.9342, 'Yb': 173.04, 'Lu': 174.967, 'Hf': 178.49, 'Ta': 180.9479, 'W': 183.85, 'Re': 186.207, 'Os': 190.2, 'Ir': 192.22, 'Pt': 195.09, 'Au': 196.9665, 'Hg': 200.59, 'Tl': 204.37, 'Pb': 207.2, 'Bi': 208.9804, 'Po': (209), 'At': (210), 'Rn': (222), 'Fr': (223), 'Ra': 226.0254, 'Ac': 227.0278, 'Pa': 231.0359, 'Th': 232.0381, 'Np': 237.0482, 'U': 238.029}
|
||||||
|
for itype in range(1, len(args.elements)+1):
|
||||||
|
L.mass(itype, mass_dictionary.get(args.elements[itype-1], 1.0e-20))
|
||||||
|
|
||||||
|
# Compute initial state at zero pressure
|
||||||
|
L.fix(3, "all", "box/relax", "aniso", 0.0)
|
||||||
|
L.min_style(args.min_style)
|
||||||
|
L.minimize(args.minimize[0], args.minimize[1], int(args.minimize[2]), int(args.minimize[3]))
|
||||||
|
|
||||||
|
L.variable("lx0 equal {}".format(L.eval("lx")))
|
||||||
|
L.variable("ly0 equal {}".format(L.eval("ly")))
|
||||||
|
L.variable("lz0 equal {}".format(L.eval("lz")))
|
||||||
|
|
||||||
|
# These formulas define the derivatives w.r.t. strain components
|
||||||
|
L.variable("d1 equal -(v_pxx1-{})/(v_delta/v_len0)*{}".format(L.eval("pxx"), cfac))
|
||||||
|
L.variable("d2 equal -(v_pyy1-{})/(v_delta/v_len0)*{}".format(L.eval("pyy"), cfac))
|
||||||
|
L.variable("d3 equal -(v_pzz1-{})/(v_delta/v_len0)*{}".format(L.eval("pzz"), cfac))
|
||||||
|
L.variable("d4 equal -(v_pyz1-{})/(v_delta/v_len0)*{}".format(L.eval("pyz"), cfac))
|
||||||
|
L.variable("d5 equal -(v_pxz1-{})/(v_delta/v_len0)*{}".format(L.eval("pxz"), cfac))
|
||||||
|
L.variable("d6 equal -(v_pxy1-{})/(v_delta/v_len0)*{}".format(L.eval("pxy"), cfac))
|
||||||
|
|
||||||
|
L.displace_atoms("all", "random", atomjiggle, atomjiggle, atomjiggle, 87287, "units box")
|
||||||
|
|
||||||
|
# Write restart
|
||||||
|
L.unfix(3)
|
||||||
|
L.write_restart("restart.equil")
|
||||||
|
|
||||||
|
for idir in range(1, 7):
|
||||||
|
displace(L, args, idir)
|
||||||
|
|
||||||
|
postprocess_and_output(L)
|
||||||
|
return
|
||||||
|
|
||||||
|
def postprocess_and_output(lmp):
|
||||||
|
"""Compute the moduli and print everything to screen """
|
||||||
|
|
||||||
|
# Output final values
|
||||||
|
c11all = lmp.variables["C11"].value
|
||||||
|
c22all = lmp.variables["C22"].value
|
||||||
|
c33all = lmp.variables["C33"].value
|
||||||
|
|
||||||
|
c12all = 0.5*(lmp.variables["C12"].value + lmp.variables["C21"].value)
|
||||||
|
c13all = 0.5*(lmp.variables["C13"].value + lmp.variables["C31"].value)
|
||||||
|
c23all = 0.5*(lmp.variables["C23"].value + lmp.variables["C32"].value)
|
||||||
|
|
||||||
|
c44all = lmp.variables["C44"].value
|
||||||
|
c55all = lmp.variables["C55"].value
|
||||||
|
c66all = lmp.variables["C66"].value
|
||||||
|
|
||||||
|
c14all = 0.5*(lmp.variables["C14"].value + lmp.variables["C41"].value)
|
||||||
|
c15all = 0.5*(lmp.variables["C15"].value + lmp.variables["C51"].value)
|
||||||
|
c16all = 0.5*(lmp.variables["C16"].value + lmp.variables["C61"].value)
|
||||||
|
|
||||||
|
c24all = 0.5*(lmp.variables["C24"].value + lmp.variables["C42"].value)
|
||||||
|
c25all = 0.5*(lmp.variables["C25"].value + lmp.variables["C52"].value)
|
||||||
|
c26all = 0.5*(lmp.variables["C26"].value + lmp.variables["C62"].value)
|
||||||
|
|
||||||
|
c34all = 0.5*(lmp.variables["C34"].value + lmp.variables["C43"].value)
|
||||||
|
c35all = 0.5*(lmp.variables["C35"].value + lmp.variables["C53"].value)
|
||||||
|
c36all = 0.5*(lmp.variables["C36"].value + lmp.variables["C63"].value)
|
||||||
|
|
||||||
|
c45all = 0.5*(lmp.variables["C45"].value + lmp.variables["C54"].value)
|
||||||
|
c46all = 0.5*(lmp.variables["C46"].value + lmp.variables["C64"].value)
|
||||||
|
c56all = 0.5*(lmp.variables["C56"].value + lmp.variables["C65"].value)
|
||||||
|
|
||||||
|
# Average moduli for cubic crystals
|
||||||
|
c11cubic = (c11all + c22all + c33all)/3.0
|
||||||
|
c12cubic = (c12all + c13all + c23all)/3.0
|
||||||
|
c44cubic = (c44all + c55all + c66all)/3.0
|
||||||
|
|
||||||
|
bulkmodulus = (c11cubic + 2*c12cubic)/3.0
|
||||||
|
shearmodulus1 = c44cubic
|
||||||
|
shearmodulus2 = (c11cubic - c12cubic)/2.0
|
||||||
|
poisson_ratio = 1.0/(1.0 + c11cubic/c12cubic)
|
||||||
|
|
||||||
|
# print results to screen
|
||||||
|
print("=========================================")
|
||||||
|
print("Components of the Elastic Constant Tensor")
|
||||||
|
print("=========================================")
|
||||||
|
|
||||||
|
print("Elastic Constant C11all = {} GPa".format(c11all))
|
||||||
|
print("Elastic Constant C22all = {} GPa".format(c22all))
|
||||||
|
print("Elastic Constant C33all = {} GPa".format(c33all))
|
||||||
|
|
||||||
|
print("Elastic Constant C12all = {} GPa".format(c12all))
|
||||||
|
print("Elastic Constant C13all = {} GPa".format(c13all))
|
||||||
|
print("Elastic Constant C23all = {} GPa".format(c23all))
|
||||||
|
|
||||||
|
print("Elastic Constant C44all = {} GPa".format(c44all))
|
||||||
|
print("Elastic Constant C55all = {} GPa".format(c55all))
|
||||||
|
print("Elastic Constant C66all = {} GPa".format(c66all))
|
||||||
|
|
||||||
|
print("Elastic Constant C14all = {} GPa".format(c14all))
|
||||||
|
print("Elastic Constant C15all = {} GPa".format(c15all))
|
||||||
|
print("Elastic Constant C16all = {} GPa".format(c16all))
|
||||||
|
|
||||||
|
print("Elastic Constant C24all = {} GPa".format(c24all))
|
||||||
|
print("Elastic Constant C25all = {} GPa".format(c25all))
|
||||||
|
print("Elastic Constant C26all = {} GPa".format(c26all))
|
||||||
|
|
||||||
|
print("Elastic Constant C34all = {} GPa".format(c34all))
|
||||||
|
print("Elastic Constant C35all = {} GPa".format(c35all))
|
||||||
|
print("Elastic Constant C36all = {} GPa".format(c36all))
|
||||||
|
|
||||||
|
print("Elastic Constant C45all = {} GPa".format(c45all))
|
||||||
|
print("Elastic Constant C46all = {} GPa".format(c46all))
|
||||||
|
print("Elastic Constant C56all = {} GPa".format(c56all))
|
||||||
|
|
||||||
|
print("=========================================")
|
||||||
|
print("Average properties for a cubic crystal")
|
||||||
|
print("=========================================")
|
||||||
|
|
||||||
|
print("Bulk Modulus = {} GPa".format(bulkmodulus))
|
||||||
|
print("Shear Modulus 1 = {} GPa".format(shearmodulus1))
|
||||||
|
print("Shear Modulus 2 = {} GPa".format(shearmodulus2))
|
||||||
|
print("Poisson Ratio = {}".format(poisson_ratio))
|
||||||
|
|
||||||
|
return
|
||||||
|
|
||||||
|
if __name__ == "__main__":
|
||||||
|
elastic()
|
||||||
Reference in New Issue
Block a user