Temperature effects in deep drawing of advanced high strength steels
Kadir Akcan1, Eren Billur2, H. İbrahim Saraç3
1Ford Otosan Inc., Kocaeli, Turkey
2Department of Automotive Engineering, Atılım University, Ankara, Turkey
3Department of Mechanical Engineering, Kocaeli University, Kocaeli, Turkey
Sheet metal forming;
Finite element analysis;
As advanced high strength steels (AHSS) find more use in automotive industry to meet crashworthiness and light weighting targets, concurrently. AHSS typically have higher strength, but lower formability; often limiting a part’s dimensions and geometric complexity. Several studies have clearly shown that, in sheet metal forming, significant portion of the work done to overcome friction and to plastically deform a sheet is converted into heat. In this study, a thermomechanical finite element model has been developed to calculate the temperature rise in forming DP800 (AHSS). The model was validated with experiments from literature. A multi-cycle model is developed to find out possible problems due to tool heating. The process and material are selected to speed up the heating. Under different realistic press conditions, failures are observed after 20 to 80 hits.
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