Four-point bend tests were performed on Cr-coated steel specimens that were pulsed laser heated (PLH) with two pulses per area from a millisecond pulse duration laser. Cracks were observed in the PLH specimens extending to the substrate. Specimens subjected to PLH exhibited reduced cycles to failure under all the loadings. This indicates that the PLH process replaces the crack initiation process, and the PLH-formed cracks give the expected crack propagation behavior. This approach provides a method to separately study the effects of crack formation and crack propagation in fatigue life tests. It is especially applicable to situations in which the cracks to be propagated are induced by thermomechanical processes.
Reduction in Fatigue Life in Cr-Coated Steel Induced by Pulsed Laser Heating
U.S. Army ARDEC,
Watervliet, NY 12189
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received October 4, 2016; final manuscript received January 10, 2017; published online February 3, 2017. Assoc. Editor: Kunio Hasegawa.
This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States. Approved for public release; distribution is unlimited.
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Warrender, J. M., and Vigilante, G. N. (February 3, 2017). "Reduction in Fatigue Life in Cr-Coated Steel Induced by Pulsed Laser Heating." ASME. J. Pressure Vessel Technol. June 2017; 139(3): 031404. https://doi.org/10.1115/1.4035789
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