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

SURFACE & COATINGS TECHNOLOGY

卷:273

Article

Coratella, S.^1,4  Sticchi, M.¹  Toparli, M. B.^3,4  Fitzpatrick, M. E.^1,4  Kashaev, N.² 

[1] Coventry Univ, Fac Engn & Comp, Coventry CV1 5FB, W Midlands, England

[2] Helmholtz Zentrum Geesthacht, Inst Mat Res, Mat Mech, D-21502 Geesthacht, Germany

[3] TUBITAK SAGE, Def Ind Res & Dev Inst, TR-06261 Ankara, Turkey

[4] Open Univ, Fac Math Comp & Technol, Milton Keynes MK7 6AA, Bucks, England

关键词: Eigenstrain;    Residual stress prediction;    Laser Shock Peening;    AA7050;   

DOI  :  10.1016/j.surfcoat.2015.03.026

来源: Elsevier

【 摘 要 】

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. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free