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Added an element test as a LIE cohesive zone benchmark #2157
This pull request is motivated to enrich secondary variables in the LIE/SmallDeformation as in the LIE/HydroMechanics, and add an element test for LIE cohesive zone model. The extended secondary variables consist of a fracture opening vector (w_n and w_s) and a fracture stress vector (f_stress_normal and f_stress_shear). With these output variables, it becomes more straightforward to make a comparison against the analytical solution in the element test.
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Jul 6, 2018