Investigating the effect of porosity on elastic modulus through finite element analysis and molecular dynamics simulations

Handrigan, Stephen M. (2019) Investigating the effect of porosity on elastic modulus through finite element analysis and molecular dynamics simulations. Masters thesis, Memorial University of Newfoundland.

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Abstract

The effect of porosity on elastic modulus was studied. First, a study with experimental load-deflection curve using Finite Element Analysis and beam theory, Euler-Bernoulli and Timoshenko, to investigate the effect of porosity on elastic modulus of a cantilever beam undergoing tip loading. It was determined that porosity amount and location affected the elastic modulus of a cantilever beam undergoing tip loading. Second, an investigation into the applicability of atomistic modelling of vacancies as a method of studying the effect of porosity on elastic modulus was completed for two materials, pure iron and iron-chromium. The study involved testing several force fields and parameter sets to determine accuracy and reliability of prediction. It was determined that vacancy amount did influence elastic modulus, with some force fields and parameter sets providing more accurate prediction in modulus and reduction in modulus due to vacancies. Results were compared to experimental data and Finite Element model from literature.

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