Endochronic description of plastic anisotropy in sheet metal

✍ Scribed by Han-Chin Wu; Hong-Ki Hong

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 370 KB
• Volume: 36
• Category: Article
• ISSN: 0020-7683
• DOI: 10.1016/s0020-7683(98)00126-7

✦ Synopsis

It is shown in this paper that an extended form of Hill|s quadratic yield criterion for anisotropic sheet metal can be derived from an endochronic theory of plasticity[ The extended form considers the combined isotropicÐkinematic hardening and the {anomalous behavior| observed in the anisotropic plastic behavior of sheet metals can be accounted for by the concept of kinematic hardening[ This form of anisotropic endochronic theory can accommodate the usual requirement of normality between the plastic strain rate and the yield function[ In addition\ the theory leads naturally to the expressions for back stresses[ This work provides an additional example to show that the form of the intrinsic time is directly related to the form of the yield function[ It is suggested that the coe.cients of the quadratic yield function be determined from the yield stresses obtained from a set of tension tests[ Þ 0888 Elsevier Science Ltd[ All rights reserved[