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Forging simulation of sintered powder compacts under various frictional conditions

✍ Scribed by Cheng-Chao Huang; Jung-Ho Cheng

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
561 KB
Volume
44
Category
Article
ISSN
0020-7403

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✦ Synopsis

This research is to investigate the deformation characteristics of sintered compacts and the evolution of voids in the forging process under di erent frictional conditions. The Gurson-Tvergaard yield criterion was used to describe the plastic behaviour of porous materials, while the material parameters were empirically determined.

Experiments and ÿnite element analysis were conducted to examine the processes. The material properties of sintered preforms were ascertained from both the uni-axial tension and compression tests. The ÿnite element models were veriÿed with the upsetting experiments under di erent frictional conditions. A simulation of forging the gear blank under various contact situations was performed as well. Studies show that voids lead to the degradation of the strength of the sintered materials. Friction at contact interfaces contributes to the non-uniformity of deformation and the density variation in the workpiece after large deformation.

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