On the relationship between stress intensity factor (K) and minimum plastic zone radius (MPZR) for four point bend specimen under mixed mode loading

Abstract

Studies on crack-tip plastic zones are of fundamental importance in describing the process of failure and in formulating various fracture criteria. Minimum plastic zone radius (MPZR) theory is widely used in prediction of crack initiation angle in mixed mode fracture analysis of engineering materials. In this study, shape and size of mixed mode (I/II) crack-tip plastic zones have been estimated by finite element analysis in a four point bend specimen according to von Mises yield criteria. The results obtained are used to analyze the MPZR criterion with respect to the effective stress intensity factor (K eff ) and elastic mode mixity (M e ).Keywords: minimum plastic zone radius, mixed mode I/II, finite element analysis, mode mixity, four point bend specimen.

Influence of crack tip plasticity on fatigue behaviour of laser stake-welded T-joints made of thin plates

“…14 [42]. In addition to the references given earlier, [66][67][68][69] give additional food for thought. [23,25,26] where the fatigue curves of Fig.…”

Mixed-mode (I/II) crack initiation direction for elastic-plastic materials based on crack-tip plastic zone

“…Prediction of crack initiation and orientation with its propagation path under mixed-mode loading is much desirable for life prediction of engineering materials. The problem involving mixed mode fracture has been extensively investigated during the past decade, Nobile (2000), Sonsino (2001), Li and Chandra (2003), Ayatollahi et al (2004), Borrego et al (2006), Johnson and Qu (2007), Smith et al (2008), Guo et al (2008), Shahani and Tabatabaei (2009) and Kudari and Sharanaprabhu (2010) have analyzed the mixed mode crack initiation and orientation problems. Several criteria have been proposed for predicting crack initiation angles under Linear Elastic Fracture Mechanics (LEFM) regime.…”