Fatigue Crack Identification in Tensile-Shear Spot Welded Joints by Dynamic Response Characteristics

[+] Author and Article Information
G. Wang, M. E. Barkey

The Department of Aerospace Engineering and Mechanics,  University of Alabama, Box 870280, Tuscaloosa, AL 35487-0280

J. Eng. Mater. Technol 127(3), 310-317 (Feb 18, 2005) (8 pages) doi:10.1115/1.1925286 History: Received August 23, 2004; Revised February 18, 2005

A theoretical model for the estimation of fatigue crack length of tensile-shear spot welded specimen is developed which incorporates the natural frequency and mode variation. The model is based on the concept that the propagation of cracks causes a release of strain energy, which is related to the structural modal shape. The effect of the structural mode shape and crack location is also explained. The model, experimental, and finite element results indicate that the existence of cracks cause the reduction of natural frequencies and change of natural modes, and that the mode shape of the structure and crack location will affect the magnitude of the change of these dynamic variables. The predictions of the model are compared with the experimental data and finite element analysis results and agreement is found to be consistent.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 9

Natural frequency variation in terms of crack length by FEA and Eq. 14

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Figure 1

Test specimen shape, dimensions and crack location

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Figure 2

Typical fatigue crack propagating process around the nugget

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Figure 3

Frequency response function measurement schematic

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Figure 4

Frequency response functions (FRFs) by experiment with different crack length ratios a∕w

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Figure 5

Through-thickness crack growth pattern (dashed lines) assumed in the finite element model

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Figure 6

Variations of the modal shapes in terms of crack length

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Figure 7

Mode shapes of spot welded specimen and one span beam at free-free condition

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Figure 8

Natural frequency variations in terms of crack location by FEA and Eq. 14

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Figure 10

Crack length ratio (First and Third mode) comparison of experimental and theoretical results

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Figure 11

Natural frequency ratio (First and Third mode) comparison of experimental and theoretical results



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