CHEN Pei-shuai, CHEN Wei-zhong, JIA Shan-po, et al. Stress return mapping algorithm of Hoek-Brown criterion in principal stress space and its redevelopment[J]. 2011, 32(7).
CHEN Pei-shuai, CHEN Wei-zhong, JIA Shan-po, et al. Stress return mapping algorithm of Hoek-Brown criterion in principal stress space and its redevelopment[J]. 2011, 32(7).DOI:
In the course of implementing elastoplastic model in the FEM
it is necessary to carry out the process of stress return mapping algorithm. It may be not converging at singular points in three-dimensional space. The transforming method in principal stress space is put forward to overcoming this shortcoming. Also
the process of determining the region of return mapping is analyzed. At last
the consistent stiffness matrix is deduced. Based on the implicit algorithm in principal stress space
the UMAT subroutine of the Hoek-Brown model is developed in ABAQUS with the Fortran programming language. Through the example of triaxial compression test
it is easy to verify the feasibility and accuracy of this method by comparing the result with Mohr-Coulomb criterion in ABAQUS.