Title: Supported Punch Shear Behaviour of Polycarbonate: Test, Analysis and Numerical Simulation
Authors: Yunfa Zhang, Qi Yang, Richard Desnoyers, and Andrew Johnston
Abstract: This paper presents the results of an investigation into the punch shear behaviour of polycarbonate. First, supported punch shear tests were carried out using injection moulded disk specimens. Ductile material behaviour was observed during the punch shear process which consisted of an elastic stage, a prolonged deformation stage, and an abrupt shear-out stage at a large displacement. The complex damage mode was investigated with the aid of scanning electron microscopy. Notably, it was found that a circumferential tensile crack existed in the punched-out specimen, indicating that tensile deformation played an important role in the punch shear process. An axisymmetric simple shear model was established assuming a uniform deformation mode. The kinematic analysis indicated that very large shear and normal strains occurred at high loads, validating the test observation that both tensile and shear damage can occur during punch shear. In addition, a finite element analysis accounting for the large deformation effect was performed. The predicted results of the average shear stress versus normalized displacement curves were in good agreement with the test results and the numerical results revealed that the punch tool clearance had a considerable influence on the punch shear response. Finally, the identification of the potential damage location and the evolution of the local plastic deformation were demonstrated.
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Publication Date: 2019/05/20
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