Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 567, Issue -, Pages 95-100Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.07.014
Keywords
Constitutive behaviour; Shear test; Spot welding; Aluminium alloys; Mechanical properties
Categories
Funding
- General Motors of Canada Ltd.
- Initiative for Automotive Manufacturing Innovation (iAMi)
- ecoEII Track A
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There is increasing demand within the automotive industry to utilize aluminium alloy sheets and their spot welds to facilitate vehicle weight reduction and increase fuel economy. While traditional uniaxial tensile testing only determines mechanical properties to small strains, direct measurement of the constitutive behaviour of aluminium alloy spot welds to large strains remains a challenge. For the first time, the present work employed digital image correlation coupled with shear testing to directly measure the constitutive behaviour of an AA6022-T4 spot weld to large strains. The results show that the spot welding process not only decreases the yield strength but also lowers the work hardening rate of the nugget versus the base material. The paint bake cycle partially recovers the yield and shear strength of the nugget. (C) 2012 Crown Copyright and Elsevier B.V. All rights reserved.
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