Non-associated flow rule with symmetric stiffness modulus for isotropic-kinematic hardening and its application for earing in circular cup drawing

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:49

Article; Proceedings Paper

Park, Taejoon¹  Chung, Kwansoo¹ 

[1] Seoul Natl Univ, Engn Res Inst, Res Inst Adv Mat, Dept Mat Sci & Engn, Seoul 151744, South Korea

关键词: Non-associated flow;    Symmetric stiffness modulus;    Earing;    Yld2000-2d;   

DOI  :  10.1016/j.ijsolstr.2012.02.015

来源: Elsevier

【 摘 要 】

Under a standard derivation, the stiffness modulus for the non-associated flow rule is asymmetric since its plastic potential (for the plastic strain increment under the normality rule) differs from the plastic yield stress function (to define the elastic range). A new formulation was developed in this work, which leads to the symmetric stiffness modulus for the non-associated flow rule, under the framework of the combined isotropic-kinematic hardening law for generalization purposes. As for its application, the non-quadratic Yld2000-2d (Barlat et al., 2003) function (and Hill's (1948) function for comparison) was utilized to validate the formulation for eating in circular cup drawing of AA2090-T3 and AA5042 sheets, which successfully represented 6 and 8 ears, respectively. (C) 2012 Elsevier Ltd. All rights reserved.

【 授权许可】

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