Experimental characterization of the mechanical behaviour and the failure of multi-sheet and multi-material spot welded assembly

•Mechanical behaviour of three-sheet multi-material spot welded assembly.•Pure opening mode, pure shear mode and mixed opening/shear mode.•A significant effect of the loading angle on the mechanical behaviour.•A pronounced effect of nugget diameter size on the ultimate force and the dissipated energ...

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Bibliographic Details
Published in:International journal of impact engineering 2019-08, Vol.130, p.226-238
Main Authors: Tounsi, R., Haugou, G., Chaari, F., Leconte, N., Markiewicz, E.
Format: Article
Language:English
Subjects:
Assembly
Dynamic testing
Engineering Sciences
Experiments
Failure modes
Mechanical properties
Mechanics
Multi-material
Multi-sheet
Shear
Spot welds
Strain rate sensitivity
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Summary:•Mechanical behaviour of three-sheet multi-material spot welded assembly.•Pure opening mode, pure shear mode and mixed opening/shear mode.•A significant effect of the loading angle on the mechanical behaviour.•A pronounced effect of nugget diameter size on the ultimate force and the dissipated energy. An experimental investigation of the mechanical behaviour of three-sheet multi-material spot welded assembly is performed. An experimental device based on the Arcan principle is developed to test the three-sheet spot welded specimen under pure opening mode, pure shear mode and mixed opening/shear mode with three nugget sizes. A significant effect of the loading angle is reported and explained by three identified failure modes as a pull-out failure mode (pure opening), an inter-facial failure mode (pure shear) and a mixed pull-out/inter-facial failure mode (mixed opening/shear). A pronounced effect of nugget diameter size is reported on the ultimate force and the dissipated energy. A preliminary study of the strain-rate sensitivity of the three-sheet multi-material spot welded assembly is also undertaken.
ISSN:0734-743X
1879-3509
DOI:10.1016/j.ijimpeng.2019.04.017