کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1585103 | 1514909 | 2006 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A bifurcation criterion for predicting weld-line failures in AA5754 alloy tailor-welded blanks A bifurcation criterion for predicting weld-line failures in AA5754 alloy tailor-welded blanks](/preview/png/1585103.png)
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.
Journal: Materials Science and Engineering: A - Volumes 435–436, 5 November 2006, Pages 62–70