Application of the eigenstrain approach to predict the residual stress distribution in laser shock peened AA7050-T7451 samples

S. Coratella, M. Sticchi, M.B. Toparli, Michael E. Fitzpatrick, K. Kashaev

Research output: Contribution to journalArticle

10 Citations (Scopus)
184 Downloads (Pure)

Abstract

Laser Shock Peening allows the introduction of deep compressive residual stresses into metallic components. It is applicable to most metal alloys used for aerospace applications. The method is relatively expensive in application, and therefore development studies often rely heavily on Finite Element Modelling to simulate the entire process, with a high computational cost. A different approach has been used recently, the so-called eigenstrain approach. The present study looks at the feasibility of applying the eigenstrain method for prediction of the residual stress in a sample that contains curved surface features. The eigenstrain is determined from a simple geometry sample, and applied to the more complex geometry to predict the residual stress after Laser Shock Peening. In particular the prediction of residual stress at a curved edge, and for different values of material thickness, have been studied. The research has demonstrated that the eigenstrain approach gives promising results in predicting residual stresses when both the thickness and the geometry of the peened surface is altered.
Original languageEnglish
Pages (from-to)39-49
JournalSurface and Coatings Technology
Volume273
DOIs
Publication statusPublished - 2015

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Surface and Coatings Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Surface and Coatings Technology [vol 273, 2015] DOI: 10.1016/j.surfcoat.2015.03.026 .

Keywords

  • Aerospace applications
  • Forecasting
  • Geometry
  • Residual stresses
  • AA7050
  • Compressive residual stress
  • Computational costs
  • Eigen-strain
  • Finite element modelling
  • Laser shock peening
  • Metallic component
  • Residual stress prediction
  • Finite element method

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