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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/11602

Title: Predicting the forming limit strains of tailor-welded blanks
Authors: NARAYANAN, RG
NARASIMHAN, K
Keywords: line movements
sheet metals
formability
behavior
Issue Date: 2008
Publisher: PROFESSIONAL ENGINEERING PUBLISHING LTD
Citation: JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN, 43(7), 551-563
Abstract: This work aims at predicting the forming limit strains of welded blanks using a thickness gradient-based necking criterion. In order to reduce the complexity and synergistic effect of tailor-welded blank (TWB) parameters, the same material and thickness sheets are considered for the entire work. The forming limit curve (FLC) of welded blanks for varied weld conditions - namely, weld orientation and location - are predicted by simulating the limit dome height (LDH) test using PAM-STAMP (ESI Group, PAM System International), a finite element code. The un-welded blank and TWB FLCs thus predicted by the thickness gradient-based necking criterion are compared with the experimental FLCs obtained by LDH test. Dome height at failure and failure location data of TWBs from experiments and prediction are also compared for varied weld conditions. It is found from the analyses that limit strain predictions correlate well (less than five per cent error) with the experimental results in the drawing region of the forming limit diagram, with the stretching region showing considerable difference. Dome height at failure and failure location prediction correlate well with those of experimental observation in most of the cases. In a few TWB cases, where considerable difference in limit strains are seen, predicted dome height at failure values deviates from experimental results.
URI: http://dx.doi.org/10.1243/03093247JSA445
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11602
http://hdl.handle.net/10054/11602
ISSN: 0309-3247
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