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Reinforcement of perforated metal sheets by thermal shock with laser beams

Experimental and numerical investigations have demonstrated the value of applying thermal shocking on perforated metal sheets in order to reduce the severity of the stress concentration at the hole, and hence to improve the fatigue life of the sheets

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Abstract

A quantitative study was conducted on the improvement of load-bearing capacity and fatigue life of a thin aluminum sheet containing a small hole by means of thermal shock generated by a pulsed laser. A finite-element computer code based on the thermoelastic-plasticity theory was used to assess the distributions of temperature and residual stresses in the affected region. Analytical results were verified by the measured values from various techniques including the X-ray diffraction method for the residual-stress measurements. The improvement of fatigue life of the sheet metals resulting from this thermal shock process has been demonstrated by tests and correlates well with a postulated empirical model with the calculated induced residual stress.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Manitoba, Winnipeg, R3T 2N2, Manitoba, Canada

    T. R. Hsu (Graduate Student), W. J. McAllister (Graduate Student) & D. A. Scarth (Graduate Student)

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  1. T. R. Hsu
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  2. W. J. McAllister
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  3. D. A. Scarth
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Hsu, T.R., McAllister, W.J. & Scarth, D.A. Reinforcement of perforated metal sheets by thermal shock with laser beams. Experimental Mechanics 22, 302–309 (1982). https://doi.org/10.1007/BF02327248

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  • DOI: https://doi.org/10.1007/BF02327248

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