Investigation of evolving yield surfaces of dual-phase steels

被引:68
作者
Hou, Yong [1 ]
Min, Junying [1 ]
Guo, Nan [1 ]
Lin, Jianping [1 ]
Carsley, John E. [2 ]
Stoughton, Thomas B. [2 ]
Traphoener, Heinrich [3 ]
Clausmeyer, Till [3 ]
Tekkaya, A. Erman [3 ]
机构
[1] Tongji Univ, Sch Mech Engn, Shanghai 201804, Peoples R China
[2] Gen Motors Global Res & Dev, Warren, MI 48092 USA
[3] TU Dortmund Univ, Inst Forming Technol & Lightweight Components, Baroper Str 303, D-44227 Dortmund, Germany
基金
国家重点研发计划;
关键词
Cruciform biaxial tensile tests; Experimental yield loci; Anisotropic yield criteria; Non-associated flow rule; Evolving yield behavior; NONASSOCIATED FLOW RULE; BIAXIAL TENSILE TEST; SHEET-METAL; PRESSURE; STRESS; CRITERION; PLANE; ANISOTROPY; STRAIN; DEFORMATION;
D O I
10.1016/j.jmatprotec.2019.116314
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The aim of this paper is to describe the evolving yield behavior of dual-phase steels during plastic deformation characterized for ten loading paths using a series of mechanical tests including uniaxial tension, uniaxial compression, in-plane torsion and cruciform biaxial tension with the aid of digital image correlation techniques for strain measurement. Large plastic strains in the gauge area of cruciform specimens tested were enabled by a laser deposition process to strengthen the arms in order to measure deformation behavior of the sheet without arbitrarily thinning the gauge section. Experimental yield loci were determined for three dual phase steels with different strength levels up to equivalent plastic strains of (similar to)0.11 for DP590, (similar to)0.07 for DP780, (similar to)0.05 for DP980, respectively. Several existing anisotropic yield criteria under both associated flow rule (AFR) and non-associated flow rule (non-AFR) were applied to describe the anisotropic yield behavior of these DP steels. A comparative study was preformed to validate prediction accuracy of yield criteria with experimental measurements including yield loci, yield stresses and r(phi)-values under uniaxial tension in seven orientations as well as yield stresses and r(b)-value under equi-biaxial tension. The results show that non-AFR significantly improved prediction accuracy of both stresses and r-values simultaneously. Under non-AFR, an order of two in the yield stress function is sufficient to accurately predict flow stresses. The evolution of both yield stress and plastic potential surfaces of DP steels were illustrated by changing parameters in the yield criterion as functions of equivalent compliance lambda(-).
引用
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页数:17
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