| Mechanical structure-property relations have been quantified for AISI 4140 steel.;under different strain rates and temperatures. The structure-property relations were used.;to calibrate a microstructure-based internal state variable plasticity-damage model for.;monotonic tension, compression and torsion plasticity, as well as damage evolution.;Strong stress state and temperature dependences were observed for the AISI 4140 steel.;Tension tests on three different notched Bridgman specimens were undertaken to study.;the damage-triaxiality dependence for model validation purposes. Fracture surface.;analysis was performed using Scanning Electron Microscopy (SEM) to quantify the void.;nucleation and void sizes in the different specimens. The stress-strain behavior exhibited.;a fairly large applied stress state (tension, compression dependence, and torsion), a.;moderate temperature dependence, and a relatively small strain rate dependence. |
