Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/14634
Title: New theoretical model for predicting limit strains in the punch stretching of sheet metals
Authors: Chakrabarty, J
Lee, WB 
Chan, KC 
Issue Date: 1999
Publisher: Elsevier
Source: Journal of materials processing technology, 1999, v. 91, no. 1, p. 257-263 How to cite?
Journal: Journal of materials processing technology 
Abstract: An initial non-uniformity in thickness of a sheet metal, which is commonly assumed as a basis for the theoretical prediction of limit strains in the biaxial stretching process, is considered here as a feature of the mathematical idealization of a complex process, rather than as a material imperfection existing in a real sheet metal. The present concept permits the degree of initial inhomogeneity to vary with the stress ratio, as well as with the mechanical properties of the material. When such a variation is allowed for in a suitable manner, the predicted forming limit curves exhibit a relatively small dependence on the degree of normal anisotropy of the sheet metal, and follow a trend that is in agreement with what is observed experimentally. The results demonstrate the importance of the non-quadratic yield function when dealing with sheet metals with a range of R-values of less than unity.
URI: http://hdl.handle.net/10397/14634
ISSN: 0924-0136
EISSN: 1873-4774
DOI: 10.1016/S0924-0136(98)00417-8
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