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TECHNICAL PAPERS

Study of Texture Effect on Sheet Failure in a Limit Dome Height Test by Using Elastic/Crystalline Viscoplastic Finite Element Analysis

[+] Author and Article Information
E. Nakamachi

Department of Mechanical Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahiku, Osaka 535, Japan

X. Dong

Department of Plastic Forming Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, China

J. Appl. Mech 64(3), 519-524 (Sep 01, 1997) (6 pages) doi:10.1115/1.2788923 History: Received April 22, 1996; Revised October 24, 1996; Online October 25, 2007

Abstract

By combining the crystalline orientation distribution with a hardening evolution equation, a new elastic/crystalline viscoplastic material model is established. We focus our discussion on looking primarily at the texture effects on the strain localization of limit dome height (LDH) tests which are simulated using our Dynamic-Explicit finite element code. Three crystalline models in addition to the classical plastic potential and associated flow law model (J2 F) are employed. The results demonstrate that, according to our failure criterion, the random orientation model shows the earliest indication of failure. The better formability is obtained for aluminum alloy 6111-T4 and cube texture models than the random crystalline orientation model. The J2 F model shows no signs of strain localization. A comparison between numerical results also confirms that the strain localization region and crystalline rotation are different, due to the crystalline orientation distribution, which is initially set.

Copyright © 1997 by The American Society of Mechanical Engineers
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