Numerical simulation research on crack propagation of plane steel

Abstract There are still two deficiencies in the study of crack propagation plane steel. One is that there few studies on theory cracking and criterion from strain field at tip; other using block discrete element method to explore propagation. In view above points, this paper proposes a strength explain extension tensile cracks shear This assumes: (1) Tensile grow along direction maximum principal strain. When γ reaches critical value, begin grow; (2) Shear most dangerous stress state. Mohr circle exceeds Coulomb failure line, starts expand. addition, applies simulate macro-mechanical response characteristics steel under load evolution process cracks. It shown stress-strain curve appears elastic, stagnant, fluctuating, falling back, etc. The basic law, stable unstable growth during whole loading process.