Laser shock processing induced residual compression: Impact on predicted crack growth threshold performance |
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Authors: | Shepard M J |
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Affiliation: | (1) Air Force Research Laboratory, Materials and Manufacturing Directorate, 45433-7817 Wright-Patterson Air Force Base, OH |
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Abstract: | Design credit is not currently taken for laser shock processing (LSP) induced compressive residual stresses in damage tolerant
design. The inclusion of these and other compressive stresses in design practice has the potential to dramatically increase
predicted fatigue crack growth threshold performance and damage tolerant design life. In the current effort, Ti-6Al-4V coupons
will be subjected to shot peening, glass bead peening, and high intensity laser shock processing. The in-depth residual stresses
due to processing will be analyzed and then input into a linear elastic fracture mechanics analysis code to predict fatigue
crack growth threshold performance. This analysis establishes both the utility and feasibility of incorporating LSP-induced
compressive residual stresses into damage tolerant design practice. |
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Keywords: | crack growth design fatigue laser shock processing residual stress |
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