Investigation on the strain-path dependency of stress-based forming limit curves
Investigation on the strain-path dependency of stress-based forming limit curves
复制标题
基于应力的成形极限曲线的应变路径依赖性研究
DOI：
10.1007/s12289-010-0989-4
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发表时间：
2011
影响因子：
2.4
通讯作者：
D. Green
中科院分区：
文献类型：
--
作者：
M. Nurcheshmeh;D. Green
Path-dependent forming limits have been computed for sheet metals undergoing various combinations of plane stress loading conditions. This paper presents a theoretical model for prediction of stress-based forming limit curves (SFLC) based on the Marciniak and Kuczynski (MK) model. Acceptable agreement was observed between calculated forming limit curves (FLC) and experimental data for AISI-1012 steel (Molaei 1999) and AA-2008-T4 alloys (Graf and Hosford Metallurgical Trans 24A:2503–2512, 1993). In this paper, the path dependency of SFLCs predicted for different non-proportional loading histories has been investigated. For a range of prestrain values in different bilinear loading paths, the SFLC remains practically unchanged. However, some strain path dependency is observed for large values of prestrain (for AISI-1012 steel) and for abrupt changes in strain path. Nevertheless, the SFLC remains a good failure criterion for virtual forming simulations because the path dependency of SFLCs is much less significant than that of strain-based FLCs.
