Correlation of material constraint with fracture toughness of interface regions in a dissimilar metal welded joint. Issue 10 (21st March 2016)

• Record Type: Journal Article
• Authors: Fan, K.; Wang, G. Z.; Xuan, F. Z.; Tu, S.T.
• Is Part Of: Fatigue & fracture of engineering materials & structures. Volume 39:Issue 10(2016:Oct.)
• Page Start: 1251
• Page End: 1262
• Publication Date: 2016-03-21
• Subjects: dissimilar metal welded joint -- equivalent plastic strain -- fracture toughness -- interface region -- material constraint; Materials -- Fatigue -- Periodicals; Fracture mechanics -- Periodicals; 620.1123
• DOI: 10.1111/ffe.12437
• Languages: English
• ISSNs: 8756-758X

Abstract

Abstract: In this work, the constraint parameter Ap based on crack‐tip equivalent plastic strain was calculated by finite element analyses for the cracks located at different locations in two interface regions in a dissimilar metal weld joint (DMWJ). The capabilities of the parameter Ap for characterizing material constraint and establishing correlation of material constraint with fracture toughness of the interface region cracks have been examined. The results show that the parameter Ap can characterize material constraint effect caused by material mismatch and initial crack positions in the interface regions. Based on the Ap, the correlation lines and formulae of material constraint with fracture toughness of the interface region cracks in the DMWJ can be established, and they may be used for obtaining material constraint‐dependent fracture toughness for the interface region cracks. The results in this work combining with those in the previous studies indicate that the parameter Ap may be a unified constraint parameter that can characterize both geometry constraint (including in‐plane and out‐of‐plane constraints) and material constraint, and it may be used in accurate fracture assessments of welded components with different geometry and material constraints.