Geometry and material unified constraint-dependent J-R curves of a dissimilar metal welded joint. (October 2022)

• Record Type: Journal Article
• Authors: Jin, H.Y.; Wang, G.Z.; Tan, J.P.; Jin, T.; Tu, S.T.
• Is Part Of: Theoretical and applied fracture mechanics. Volume 121(2022)
• Publication Date: 2022-10
• Subjects: Unified constraint parameter -- J-R curve -- Dissimilar metal welded joint -- Material constraint -- Crack; Fracture mechanics -- Periodicals; 620.1126
• DOI: 10.1016/j.tafmec.2022.103456
• Languages: English
• ISSNs: 0167-8442

Abstract

Highlights: Geometry and material unified constraint-dependent J - R curves have been studied. The unified constraint-dependent J-R curve equations have been established. The prediction accuracy of the equations has been verified by experimental J-R curves. The method of constructing unified constraint-dependent J-R curves has been developed. Abstract: To conduct accurate structural integrity assessment for dissimilar metal welded joint (DMWJ) with interface region cracks, the unified constraint-dependent J - R curves with considering both geometry and material constraints need to be studied and established. In this work, based on a new load-independent unified constraint parameter Ad * and experimental J-R curves of two cracks at interface regions in a DMWJ in nuclear power plants, the unified constraint-dependent J-R curve equations have been investigated and obtained. The prediction accuracy of the equations has been verified by experimental J-R curves measured from single edge-notched bend (SEN(B)) specimens with different out-of-plane and in-plane constraints. The J-R curve equations with considering unified constraint can be applied in structural integrity assessment of the DMWJ structure for improving accuracy. The methods of applying and constructing unified constraint-dependent J-R curves are discussed.