Forming Limit of Holed Dome in Two-Stage Stretch Forming

Abstract:

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This paper deals with the accurate prediction of forming limit of a dome with a circular hole in two-stage stretch forming. Since this two-stage forming is a process of non-proportional deformation, a fracture criterion, which is capable to predict fracture limit of sheet metal under non-proportional strain path, is introduced. The limit dome height of steel blank is predicted by utilizing numerical optimization technique, in which the fracture criterion is used as a constraint function to avoid sheet breakage. The calculated result and the corresponding experimental result show that the fracture criterion can successfully predict the limit dome height in the two-stage forming while the classical forming limit diagram (FLD) overestimates it.

Info:

Periodical:

Advanced Materials Research (Volumes 146-147)

Edited by:

Sihai Jiao, Zhengyi Jiang and Jinglong Bu

Pages:

844-847

DOI:

10.4028/www.scientific.net/AMR.146-147.844

Citation:

A. Hirahara et al., "Forming Limit of Holed Dome in Two-Stage Stretch Forming", Advanced Materials Research, Vols. 146-147, pp. 844-847, 2011

Online since:

October 2010

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Price:

$35.00

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