We proposed a technique to determine a neck profile from the displacements of some marked parts of a metallic sheet. The neck width remains almost the same during evolution, and only its thickness changes. The discrepancy between the calculated strains to failure of a sample and the experimental values is partly explained by nonlinear deformation paths of the points under study. A sample with the sharpest stress concentrator fails at the highest local strains and has a neck of the smallest thickness. The softest steel exhibits the maximum local narrowing before failure, and all steels under study are characterized by ductile fracture. The degree of thinning of a 2-m-thick sample is larger than that of a 1-mm-thick sample, and the neck in the former case is narrower and deeper.
Evolution of a neck profile in automobile body sheet steels with various stress concentrators
Russian Metallurgy (Metally) ; 10 ; 953-959
2010
7 Seiten, 7 Bilder, 2 Tabellen, 26 Quellen
Article (Journal)
English
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