STUDY OF TEXTURE EFFECT ON SHEET FAILURE IN A LIMIT DOME HEIGHT TEST BY USING ELASTIC CRYSTALLINE VISCOPLASTIC FINITE-ELEMENT ANALYSIS/

By combining the crystalline orientation distribution with a hardening evolution equation, a new elastic/crystalline viscoplastic material m odel is established. We focus our discussion on looking primarily at t he texture effects on the strain localization of limit dome height (LD H) rests which are simulated using our Dynamic-Explicit finite element code. Three crystalline models in addition to the classical plastic p otential and associated flow law model (J(2)F) are employed. Tile resu lts demonstrate that, according to our failure criterion, the random o rientation model shows the earliest indication of failure. The better formability is obtained for aluminum alloy 6111-T4 and cube texture mo dels than the random crystalline orientation model, The J(2)F model sh ows no signs of strain localization. A comparison between numerical re sults also confirms that the strain localization region and crystallin e rotation are different, due to the crystalline orientation distribut ion which is initially set.