A method of computing a supercritical stage of elastic plastic material failure at dynamic loading is given.
The method is based on the concept of existence and development of a surface of elastic plastic material failure in a stress space for which a surface of Mises yield is treated when the material has reached ultimate (critical) strain rate.
Supercritical stage of material failure is simulated by shearing (kinematical softening) and compressing (isotropic softening) of failure surface according to a linear law.
Stability of computing supercritical stage of failure with a negative inclination angle of a material formation diagram is obtained by splitting failure process into two stages: a stage of strain hardening and a stage of material strainless softening at each time step.
Numerical solution of the problem on crack propagation in a sample with finite-element code using this method of computation is exemplified. Computational results are compared with available experimental data.
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