Experimental and numerical investigation of failure mode in geometrically imperfect DP590 steel

Abstract

Various microstructure-level finite element models were generated according to the real microstructure of DP590 steel to capture the mechanical behavior and fracture mode. The failure mode of the dual-phase (DP) steels, mainly resulting from microstructure-level inhomogeneity and initial geometrical imperfection, was predicted using the plastic strain localization theory. In addition, dog-bone-type tensile test specimens with different edge qualities were prepared and the deformation processes were recorded using a digital image correlation system. When the steel exhibited no initial geometrical imperfection, void initiation was triggered by decohesion between martensite and ferrite which was predicted based on the severe strain concentration, or tensile stress in areas where stress triaxiality and strain values were high. Final failure was caused by shear localization in the vicinity. Moreover, the initial geometrical imperfections severely affected the overall ductility and failure mode of the DP590 steel. When initial geometrical imperfections were deeply ingrained, an incipient crack began at the site of initial geometrical imperfection, and then caused progressive damage throughout the microstructure, from the area of shear localization to the final fracture. Overall, the depth of the geometrical imperfection was the critical factor in determining whether internal decohesion or a local crack plays a dominant role.representative volume element, dual-phase (DP) steel, geometrical imperfection, failure mode Citation:Zhuang X C, Xu C, Zhao Z. Experimental and numerical investigation of failure mode in geometrically imperfect DP590 steel.

Influence of Geometrical Imperfection on Failure Mode of DP780 Steel Utilizing Damage Models Embedded RVE Technique

“…Additionally, a dislocation based strain hardening approach [7] was applied to model single phase flow curve in former studies using RVE technique. The model with parameters according to Zhuang et al [6] and the flow curve are shown in Fig. 2.…”

“…However, including the mentioned researches, the concentration is mainly placed on the mechanism of failure mode induced by the heterogeneous microstructure, without considering deformation history of previous process. An investigation has been made with a geometrically imperfect DP590 steel by Zhuang et al [6]. The imperfection was ingrained on the edge of RVE model, which was assumed as a consequence of previous process.…”