Low-Cycle Fatigue Life Prediction of 10CrNi3MoV Steel and Undermatched Welds by Damage Mechanics Approach

Welding of steel is a technique frequently used in practical engineering applications; however, their mechanical performance strongly dependent on the physical metallurgical status weldments. In present study, fully reversed, strain-controlled low-cycle fatigue (LCF) tests were conducted 10CrNi3MoV and its undermatched weldments with strain amplitudes varying from Δ ε = ±0.5 to ±1.2%. Both base metal exhibited softening behavior at beginning cyclic stage. Numerical investigations stress–strain evolutions materials have been studied by plastic model considering nonlinear hardening. The continuous damage mechanics (CDM) theory based experimental hysteresis energy concept was employed illustrate LCF failure, including initiation deterioration. approach calibrates material parameters measured life for growth stages. Afterward, combination implemented predict life. Good agreement can be observed between results FE CDM approach. Finally, evolution under different this assessed.