An analysis of thickness effects in the Izod test
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The Izod impact test is analyzed numerically using a polymer constitutive relation with material parameters qualitatively representative of a polycarbonate. The computations are full 3D transient analyses using explicit time integration and accounting for finite strains. The main purpose of the analyses is a comparison of the stress and strain fields that develop for the various specimen geometries that are used in practice, ranging from a specimen with a square cross-section to a specimen with a width about a quarter of that value. It is shown that the response varies from something close to a plane strain response to something close to a plane stress response. The results illustrate the effect of the stress-strain behavior of polymers, which involves attaining a stress peak, followed by softening and then by the gradual evolution of a very stiff response resulting from increasing network stiffness. © 2008 Elsevier Ltd. All rights reserved.
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International Journal of Solids and Structures
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Tvergaard, V., & Needleman, A
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Tvergaard, V||Needleman, A
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Computer Simulation
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Izod Test
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Polymer
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Viscoplasticity
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