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Fatigue Crack Growth in Peened Friction Stir WeldsFriction stir welding induces residual stresses that accelerates fatigue crack growth in the weld nugget. Shot peening over the weld had little effect on growth rate. Laser peening over the weld retarded the growth rate: Final crack growth rate was comparable to the base, un-welded material. Crack tunneling evident from residual compressive stresses. 2195-T8 fracture surfaces were highly textured. Texturing makes comparisons difficult as the material system is affecting the data as much as the processing. Material usage becoming more common in space applications requiring additional work to develop useful datasets for damage tolerance analyses.
Document ID
20090002675
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Forth, Scott C. (NASA Johnson Space Center Houston, TX, United States)
Hatamleh, Omar (NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 24, 2013
Publication Date
December 15, 2008
Subject Category
Metals And Metallic Materials
Meeting Information
Meeting: International Conference on Laser Peening
Location: Houston, TX
Country: United States
Start Date: December 15, 2008
End Date: December 17, 2008
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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