Size Effects in Void Coalescence

Kim Lau Nielsen*

*Corresponding author for this work

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

Abstract

The importance of the strain gradients that evolves at the onset of void coalescence at micron-scale is demonstrated through a detailed numerical study. Here, a 3D numerical framework is exploited to grain a parametric understanding of the influence of void size and void spacing, and a direct comparison to a recent extension of the coalescence criterion by Thomason is presented. Taking into account the intrinsic length scales inherited by the ductile failure process shows a clear increase in the level of the average volume stress, perpendicular to the plane of localization, at which void coalescence occurs. Oblate voids are particularly affected by the evolving strain gradients. The increase in stress level predicted in a gradient enhanced matrix material are, however, yet to be properly addressed in existing continuum models as both the Thomason criterion, as-well as the Gurson modeling framework, rest on conventional plasticity theory.
Original languageEnglish
Publication date2016
Number of pages2
Publication statusPublished - 2016
Event24th International Congress of Theoretical and Applied Mechanics - Montreal, Canada
Duration: 21 Aug 201626 Aug 2016

Conference

Conference24th International Congress of Theoretical and Applied Mechanics
CountryCanada
CityMontreal
Period21/08/201626/08/2016

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