Abstract
Experiments and FEM analysis on the piercing of small holes were carried out. Small hole, in this paper, means that the diameter is smaller than the thickness of the material. Material deformation in the piercing differs from that of conventional shearing. So, the piercing processes were calculated by rigid-plastic FEM analysis and elastic-plastic FEM analysis, experimental and FEM analytical results were compared, and material deformations and piercing forces were investigated. The results of elastic-plastic FEM analysis showed good agreement with the experiment results even more than the results of rigid-plastic FEM analysis.
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