Size-Effects in Void Growth

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The size-effect on ductile void growth in metals is investigated. The analysis is based on unit cell models both of arrays of cylindrical voids under plane strain deformation, as well as arrays of spherical voids using an axisymmetric model. A recent finite strain generalization of two higher order strain gradient plasticity models is implemented in a finite element program, which is used to study void growth numerically. The results based on the two models are compared. It is shown how gradient effects suppress void growth on the micron scale when compared to predictions based on conventional models. This increased resistance to void growth, due to gradient hardening, is accompanied by an increase in the overall strength for the material. Furthermore, for increasing initial void volume fraction, it is shown that the effect of gradients becomes more important to the overall response but less important to the suppression of void growth.
Original languageEnglish
Title of host publicationProceedings of the 21st International Congress of Theoretical and Applied Mechanics with CD-ROM
EditorsW. Gutkowski, T. A. Kowalewski
PublisherSpringer Verlag
Publication date2005
ISBN (Print)1-4020-3456-3
Publication statusPublished - 2005
Event21st International Congress of Theoretical and Applied Mechanics - Warsaw, Poland
Duration: 15 Aug 200421 Aug 2004
Conference number: 21


Conference21st International Congress of Theoretical and Applied Mechanics
Internet address

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