| Abstract Scope |
The dynamic strain aging (DSA) effect is observed in an automotive dual-phase steel sheet (DP1000) for a certain range of strain rates and temperatures. For the investigation of DSA effect on the plastic flow and fracture behavior as well as its interaction with temperature, strain rate and stress state, an extensive experimental program at lab scale is designed. Mechanical tests of smooth dog-bone, central-hole, notched dog-bone, and simple shear specimens are conducted at various temperatures and strain rates. The extended Modified Bai Wierzbicki (eMBW) damage model considering the effects of stress state, strain rate and temperature on the plasticity and damage/fracture behavior is employed to capture the DSA phenomenon in experiments. Furthermore, the scanning electron microscope (SEM) and/or transmission electron microscope (TEM) methods are conducted to reveal the mechanisms of the DSA effect on the plasticity and fracture behavior of steels. |