Journal
MATERIALS & DESIGN
Volume 30, Issue 4, Pages 1008-1013Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2008.06.048
Keywords
Fatigue damage; Natural frequency; Spot-welded joint
Categories
Funding
- Beijing Natural Science Foundation [3042003]
- National Natural Science Foundation of China [50575004]
- Academic Human Resources Development in Institutions of Higher Learning
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According to the observation of fatigue fractography for the spot-welded joints, cracking behavior was modeled for specimens of different dimensions using 3D FEA of a progressively growing crack that began at the joining surface, progressed to the outside surface, and finally broke. The natural frequency ratio of experimental and modeled situations displayed identical nonlinear damage behavior for different dimensional specimens. Thus, a new damage variable was proposed to measure fatigue damage using natural frequency nonlinear behavior, and a nonlinear fatigue damage model was developed. The results showed that this model can successfully describe fatigue damage for spot-welded joints. (C) 2008 Elsevier Ltd. All rights reserved.
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