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Study on Modal Shape Change as a Damage Index for Spot Welds

The mode shape change of tension shear spot welds with propagation of crack was studied. Mode shape would change as crack exists, while the change is not so explicit. Difference between uncracked and cracked model modal shapes showed violent changes, but not give enough information of the crack location. Further Difference between two neighbouring points also can give information of crack, but also not saliently. Combination of the two would give explicit crack location information of the crack for tension shear spot welds.