Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)
- 2003.10b
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- Pages.22-25
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- 2003
INVESTIGATION ON PREDICTION OF FORMING LIMIT FOR COLD UPSETTING BY UTILIZING ENERGY FRACTURE CRITERION
- Lee Rong-Shean (Professor, Department of Mechanical Engineering, National Cheng Kung University) ;
- Wang Shui-To (Department of Computer Application Engineering, Far East College) ;
- Chen Jih-Hsing (Graduate Student, Department of Mechanical Engineering, National Cheng Kung University)
- Published : 2003.10.01
Abstract
The forming limits are studied for cold upsetting of high strength aluminium alloy in the present paper. Different geometry ratio and frictional conditions are investigated in the forgeability test to evaluate the forming limits and also to obtain the various strain paths. The critical fracture value can be obtained by integrating along the strain path till free surface crack initiation. To predict the damage evolution of cold upsetting, the computer-aided evaluation of forming limits is obtained by using the finite-element software DEFORM-3D and the modified Cockcroft-Latham criterion. The predicted theoretical limit strains agree quite well with the experimental results.