Effect of Treatment Area on Residual Stress and Fatigue in Laser Peened Aluminum Sheets

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Two 2.0-mm-thick aluminum sheets were laser peened and the resulting residual stresses were measured using incremental hole drilling, surface X-ray diffraction, and synchrotron X-ray diffraction techniques. Laser peening was applied to two samples using the same laser peening parameters, but one of the samples has a larger peened area. The aim of this research was to discover the effect of peen area on residual stress, for application in aerospace structures for fatigue life enhancement. It was found that a larger peened area has higher and deeper compressive stresses in the crack-opening direction, leading to greater enhancement of fatigue life.
Original languageEnglish
Pages (from-to)1519-1523
JournalMetallurgical and Materials Transactions A
Issue number4
Early online date18 Jan 2017
Publication statusPublished - Apr 2017


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