Consideration of strength differential effect in sheet metals with symmetric yield functions

被引:77
作者
Lou, Yanshan [1 ]
Huh, Hoon [1 ]
Yoon, Jeong Whan [2 ]
机构
[1] Korea Adv Inst Sci & Technol, Sch Mech Aerosp & Syst Engn, Taejon 305701, South Korea
[2] Swinburne Univ Technol, Fac Engn & Ind Sci, Hawthorn, Vic 3122, Australia
关键词
Strength differential effect; Twinning; Asymmetric yield function; Anisotropic yield function; Sheet metal forming; PLANE-STRESS CONDITIONS; ALUMINUM-ALLOY SHEETS; ORTHOTROPIC PLASTICITY; CRITERION; PRESSURE; ANISOTROPY; TITANIUM; TENSION; LOCUS;
D O I
10.1016/j.ijmecsci.2012.11.010
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
A simple approach is proposed to extend symmetric yield functions for the consideration of strength differential (SD) effect in sheet metals. The SD effect is coupled with symmetric yield functions by simply adding a weighted pressure term for anisotropic materials based on the approaches of Spitzig et al. (Pressure dependence of yielding and associated volume expansion in tempered martensite. Acta Metall 1995;23:885-893), Spitzig and Richmond (The effect of pressure on the flow stress of metals. Acta Metall 1984;32:457-463) and Stoughton and Yoon (A pressure-sensitive yield criterion under a non-associated flow rule for sheet metal forming, Int J Plast 2004;20:705-731). This approach is applied to the symmetric Yld2000-2d yield function (Barlat et al. Plane stress yield function for aluminum ally sheets Part I: Theory, Int J Plast. 2003;19:1297-1319. The Yld2000-2d yield function is then modified to describe the anisotropic and asymmetric yielding of two aluminum alloys with small SD effect: Al 2008-T4 and Al 2090-T3 and four hexagon-closed packed (HCP) metals with strong SD effect: pure textured magnesium, an Mg 0.5% Th Sheet, an Mg 4% Li sheet and a Ti-4 Al-1/4 O-2 titanium sheet. The predicted yield surfaces are compared with experimental results for the evaluation of the modified yield function. The comparison reveals that both anisotropy and asymmetry are correctly modeled by the proposed approach. (c) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:214 / 223
页数:10
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