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→Small deformation theory: Changed "rock" to material. No mention of material type prior to this point, and plasticity theory can be generalized to many material types. |
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* '''Elasticity''' ([[Hooke's law]]). In the linear elastic regime the stresses and strains in the material are related by
:::<math>
\boldsymbol{\sigma} = \mathsf{
</math>
:::where the stiffness matrix <math>\mathsf{
* '''Elastic limit''' ([[Yield surface]]). The elastic limit is defined by a yield surface that does not depend on the plastic strain and has the form
:::<math>
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