Void growth to coalescence in a non-local material

Research output: Book/ReportReportResearchpeer-review

Abstract

The size-effect in metals containing distributed spherical voids is analyzed numerically using a finite strain generalization of a length scale dependent plasticity theory. Results are obtained for stress-triaxialities relevant in front of a crack tip in an elastic-plastic metal. The influence of different material length parameters in a multi-parameter theory is studied, and it is shown that the important length parameter is the same as under purely hydrostatic loading. It is quantified how micron scale voids grow less rapidly than larger voids, and the implications of this in the overall strength of the material is emphasized. It is concluded that for cracked specimens not only the void volume fraction, but also the typical void size is of importance to the fracture strength of ductile materials.
Original languageEnglish
PublisherDCAMM, Technical University of Denmark
Publication statusPublished - 2006
SeriesUden navn
NumberReport no. 722

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