HIGHLIGHTS
SUMMARY
Time-independent inelastic deformation basically refer to plastic deformations, which occur when the effective stress reach a certain point. Similarly, viscoplasticity consists of irreversible deformations that develop over time, regarded that the stress levels also reach a critical value. The Modified Cam-Clay (MCC) failure criteria adapted for cyclic loading condition is adopted for both shale rock and sandstone. Based on loading conditions and material properties, a certain yield function is responsible for deciding whether the material deformation is under elastic or (visco)plastic regime. The effective stress path is characterized by the load . . .
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