Time-dependent Springback

被引：12

作者：

Lim, H. ^{[1
]}

Lee, M. G. ^{[2
]}

Sung, J. H. ^{[1
]}

Wagoner, R. H. ^{[1
]}

机构：

[1] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA

[2] Korean Inst Machinery & Mat, Chang Won 641010, Kyeongnam, South Korea

来源：

INTERNATIONAL JOURNAL OF MATERIAL FORMING | 2008年 / 1卷 / Suppl 1期

关键词：

Springback; Time-dependent; AHSS; Draw-bend test; Anelasticity; Creep; Residual stress;

D O I：

10.1007/s12289-008-0015-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Draw-bend tests performed some years ago on four aluminum alloys (2008-T4, 5182-O, 6022T4, and 6111-T4) revealed that specimens can continue to change shape for long periods, up to 15 months, following forming and unloading [1]. Contemporaneous tests of autobody steels (DQSK, AKDQ and HSLA steels) tested under identical conditions showed no such time-dependent springback over a 7 year period [2]. Current, preliminary results for a few advanced high strength steels (DP600, DP800, DP980 and TRIP780) revealed time-dependent springback at room temperature; the sign of the springback reversing for certain combinations of process conditions. Time-dependent behavior of four advanced high strength steel was measured and creep-simulated for various test conditions. Comparisons show qualitative agreement, but the simulations over-predict the magnitude of the effect

引用

页码：157 / 160

页数：4

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