A Micromechanically-motivated Phenomenological Model for Predicting Ductile Fracture Initiation. (2017)

• Record Type: Journal Article
• Authors: Mu, Lei; Zang, Yong; Li, Xiao Long; Araujo Stemler, Pedro Malaquias
• Is Part Of: Procedia engineering. Volume 207(2017)
• Page Start: 2054
• Page End: 2059
• Publication Date: 2017
• Subjects: ductile fracture -- uncoupled model -- stress triaxiality -- Lode parameter -- void evolution; Engineering -- Congresses; Engineering -- Periodicals; Engineering; Conference proceedings; Periodicals; 620.005
• DOI: 10.1016/j.proeng.2017.10.1062
• Languages: English
• ISSNs: 1877-7058

Abstract

Abstract: A phenomenological ductile fracture initiation model is developed based on the assumption that onset of fracture is a limit state of void evolution followed by void coalescence at microscopic level. In the model, void grows in two typical deformation modes: a) void dilation and b) void elongation/rotation. The fracture initiation model is transformed from stress space into the space of equivalent plastic strain, stress triaxiality and Lode parameter. A parametric study is carried out to better understand the effects of model parameters. The comparison with the experimental data (DP590, TRIP690, 5083-O aluminum alloy) shows a good prediction capability of the proposed model in a large range of stress state for various materials.