Damage and Void Shape Evolution during Destructive Testing of Resistance Spot Welded Joints

Kim Lau Nielsen*

*Corresponding author for this work

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

Abstract

Ductile plug failure of resistance spot welded test specimens is studied, using the recent extensions to the Gurson model accounting for non-spherical void growth or damage development during low triaxiality shearing. A comparison of the predicted mechanical response is presented when using either i) the Gurson-Tvergaard-Needleman (GTN) model [1, 2], ii) the shear extension to the GTN-model by Nahshon and Hutchinson [3] or iii) the Gologanu-Leblond- Devaux (GLD) model [4]. All models are here based on an elastic-viscoplastic constitutive relation and account for void nucleation, void growth and coalescence. Hence, the only damage parameter is the void volume fraction, f, while a void shape parameter, W = R1/R2, denoting the void aspect ratio, exists in the GLD-model. Here, R1 and R2 are the length of the first and second axes of the spheroidal voids, respectively. Thus, W > 1 corresponds to a prolate void, while W < 1 is an oblate void. The work to be presented is based on the studies in [5, 6, 7]. In [5], the GTN-model was used to reproduce experimental observations for the plug failure mode during shear-lab testing, while the change from plug failure to interfacial shear failure was modelled using a shear modified GTN-model in [6]. A study of the void shape evolution is presented in [7] together with a comparison of the above models.
Original languageEnglish
Publication date2009
Number of pages2
Publication statusPublished - 2009
Event7th European Solid Mechanics Conference - Lisbon, Portugal
Duration: 7 Sep 200911 Sep 2009

Conference

Conference7th European Solid Mechanics Conference
CountryPortugal
CityLisbon
Period07/09/200911/09/2009

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