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To implement a decomposition of strain energy density in phase field approach to fracture accounting for orthotropic materials

Vahid Ziaei Rad requested to merge vahidzrad/ogs-anisotropy:material_anisotropy into master

To account for the tension-compression asymmetry in the phase field approach to fracture, this MR implements a decomposition of constitutive relations into crack-driving and persistent portions, specifically designed for materials with anisotropic/orthotropic behavior. Two split models, namely, volumetric-deviatoric and no-tension are added in the MaterialLib/SolidModels for this purpose. Further extension of no-tension to a three-dimensional setting will be subject of a subsequent MR. Also, a c_test is added for this benchmark.

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