Abstract
It is possible to look at the critical point determination as a sign change in the second derivative of the yield function. Numerical method in determining critical stress in geomechanical material using an iterative algorithm for different loading paths is presented. The constitutive relationships of the hierarchical single surface (HISS) model were used to describe the granular material during deformation. Critical stresses under applied triaxial compression and extension obtained numerically were compared with published experimental results for Leighton Buzzard Sand.
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