Evaluation of material models and element types for sheet metal formning of titanium

In the last decades, the growing competitiveness of the market has continuously driven the forming companies to highly optimize their products regarding offered performance at minimum cost. In order to achieve better products, studies where conducted with different material models when simulating the forming process of titanium. The material is often used in heat exchanger applications. Titanium has a HCP structure which results in high anisotropy in rolled sheet metal. It is of importance to be able to simulate the sheet metal forming process of titanium in a more precise way both regarding formability and springback. In this work different material models for titanium where used and evaluated against experimental work in special test module tools (TMT). The evaluation is made by comparing results of simulations with pressed test parts in titanium. This paper describes FE-analysis of springback using the YLD 2000 model compared to the anisotropic-viscoplastic material model. Different element types were also analysed. It has been shown that material model YLD 2000 and elements with through thickness stretch gives the most accurate results in the performed simulations. (Less)