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Numerical study of strength mismatch in cross-weld tensile testing

Acar, M. O.; Gungor, S.; Fitzpatrick, M. E. and Bouchard, P. J. (2011). Numerical study of strength mismatch in cross-weld tensile testing. In: International Congress on Advances in Welding Science and Technology for Construction, Energy and Transportation Systems (AWST 2011) , 24-25 October 2011, Antalya, Turkey.

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Abstract

The strength mismatch effect on the deformation behaviour of defect-free cross-weld tensile specimens, where there is a variation in strength along the length of the specimen, was investigated through 2D finite element analysis. A simple bi-material model, which is generally used in current engineering assessments (e.g. R6 “Assessment of the integrity of structures containing defects”) to examine the strength mismatch effect on the deformation and fracture behaviour of a weld which actually includes a heat-affected-zone, could lead to non- conservative or overly conservative predictions. In fusion welded components, one would generally observe that there is a heat-affected zone where the material properties are different from the weld and base material, and there is a continuous gradient of properties between the two. The material properties in HAZ are generally assigned discretely; however, in our multi-material model these properties are successfully assigned continuously by embedding subroutines into finite element model. This multi-material approach was used to examine the effect of strength mismatch on the local and global deformation behavior of fusion welds. It has been found that the bi-material modeling, by ignoring the HAZ, and multi-material discrete HAZ modeling of the cross-weld specimens leads to unrealistically biaxial stresses at the interfaces where there is an abrupt variation of the material properties. However, multi- material continuous HAZ modeling eliminates unrealistic stress biaxiality and enables to examine the local deformation more accurately. It was also found that the global stress-strain behaviour obtained using the bi- material and multi-material modeling is different.

Item Type: Conference Item
Copyright Holders: 2011 The Open University
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetEDF (formerly British Energy), UK
Not SetNot SetRoyal Society through the Industry Fellowship scheme
Not SetNot SetGrant through The Open University from The Lloyd's Register Educational Trust
Keywords: cross-weld; tensile testing; finite element analysis
Academic Unit/Department: Mathematics, Computing and Technology
Mathematics, Computing and Technology > Engineering & Innovation
Related URLs:
Item ID: 30017
Depositing User: Salih Gungor
Date Deposited: 26 Jan 2012 14:56
Last Modified: 03 Dec 2012 15:34
URI: http://oro.open.ac.uk/id/eprint/30017
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