Boundary damage effects on the evolution of creep strain
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The effect of a reduced section thickness leading to creep strain greater than that observed in the creep response of thicker sections is termed the thickness debit effect. We carry out three-dimensional analyses of the creep response of specimens with rectangular cross sections under uniaxial tensile loading having a boundary damage layer and explore whether this can account for the thickness debit effect. The particular damage mechanism modeled is plastic void nucleation, growth and coalescence with void nucleation taken to be confined to a surface layer and the material characterized as an elastic-power law creeping solid. Three-dimensional transient analyses are carried out but used to simulate quasi-static loading conditions. Results are presented for the effect of the thickness of the boundary damage layer on the creep response. The effect of varying the parameters characterizing the void nucleation process is also investigated. The results qualitatively exhibit a variety of features of the thickness debit effect seen in experiments. 2008 IOP Publishing Ltd.
Modelling and Simulation in Materials Science and Engineering
author list (cited authors)
Gullickson, J., Needleman, A., Staroselsky, A., & Cassenti, B.