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Update pair_granular.rst

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Correct formula for tangent stiffness, consistent with `PairGranular::mix_stiffnessG()`
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Jibril B. Coulibaly
2019-12-06 10:40:04 -06:00
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doc/src/pair_granular.rst
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@ -432,7 +432,7 @@ option by an additional factor of *a*\ , the radius of the contact region. The t
Here, *a* is the radius of the contact region, given by :math:`a =\sqrt{R\delta}`
for all normal contact models, except for *jkr*\ , where it is given
implicitly by :math:`\delta = a^2/R - 2\sqrt{\pi \gamma a/E}`, see
discussion above. To match the Mindlin solution, one should set :math:`k_t = 8G`, where :math:`G` is the shear modulus, related to Young's modulus
discussion above. To match the Mindlin solution, one should set :math:`k_t = 4G/(2-\nu)`, where :math:`G` is the shear modulus, related to Young's modulus
:math:`E` by :math:`G = E/(2(1+\nu))`, where :math:`\nu` is Poisson's ratio. This
can also be achieved by specifying *NULL* for :math:`k_t`, in which case a
normal contact model that specifies material parameters :math:`E` and