A bifurcation criterion for predicting weld-line failures in AA5754 alloy tailor-welded blanks
✍ Scribed by C.J. Bayley; A.K. Pilkey
- Publisher
- Elsevier Science
- Year
- 2006
- Tongue
- English
- Weight
- 465 KB
- Volume
- 435-436
- Category
- Article
- ISSN
- 0921-5093
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✦ Synopsis
A methodology is proposed to evaluate the influence of weld-line surface roughness on the failure of AA5754 tailor-welded blanks (TWBs) loaded in plane-strain tension with major strains oriented along the weld-line. Failure is predicted when a band of elements within the finite element model satisfies a bifurcation criterion signalling the onset of shear band localization. Such an approach provides both a quantitative basis for assessing the role of surface defects on weld-line localization behaviour as well as a tool for predicting the relative formability of the weld and parent sheet materials. Significant reductions in failure strain are predicted for the TWB as a result of the decreased work hardening rate of the weld-metal relative to the base metal. On the other hand, changes in failure strain for different sized surface defects are found to be comparatively small.