Stress–Strain Behaviors in Large Plastic Strain Ranges under Monotonic Loading

Abstract

For ultra-low-cycle fatigue problems, it is a prerequisite to first understand the plasticity behaviors of metal. For monotonic loading, the true stress–true strain data till fracture is of great importance for ductile fracture evaluation. Post-necking modification for the true stress–true strain data is required since the stress state after necking is not uniaxial. In this chapter, a modified weighted average method is proposed and compared with other two methods. The applicability of the method for structural steel is also proved through tension coupon tests and corresponding numerical simulation.