Investigating the effect of porosity on the elastoplastic behavior of powder-based sintered metals through finite element analysis

Thomas, D. Frank (2021) Investigating the effect of porosity on the elastoplastic behavior of powder-based sintered metals through finite element analysis. Masters thesis, Memorial University of Newfoundland.

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Abstract

The effect of porosity, void shape, and aspect ratio on the mechanical behavior of porous ductile metals was studied. Traditional finite element models were developed to predict the elastic modulus and yield stress of porous representative volume elements as a function of porosity and void aspect ratio. Corresponding models were built and tested in ABAQUS for comparison. The effect of void shape and aspect ratio on effective mechanical properties was observed and the necessity of finite element simulations was confirmed. An algorithm for the generation of realistic porous powder-based sintered representative volume element models was fully developed and implemented. A series of models were generated and simulations were performed to extract the effective stress-strain behavior using continuum mechanics methods. Comparisons to existing experimental data for porous sintered metals determined that the three dimensional models generated by the novel algorithm accurately predict the elastic, yield, and plastic deformation behavior of porous sintered metals.

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