On the effect of the orientation of sheet rolling direction in shot peen forming

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DOIResolve DOI: http://doi.org/10.1016/j.jmatprotec.2013.01.003
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Journal titleJournal of Materials Processing Technology
Pages926938; # of pages: 13
Subject2024-T3; Accurate prediction; Finite Element; Finite element simulations; Initial stress; Manufacturing process; Maximum deflection; Numerical results; Orthotropy; Peen forming; Plastic anisotropy; Radii of curvature; Rolling direction; Sheet material; Sheet rolling; Shot peen; Wing skins; Aerospace industry; Anisotropy; Compressive stress; Residual stresses; Shot peening
AbstractPeen forming is commonly used in the aerospace industry to shape large and thin panels, such as wing skins. This manufacturing process uses shot peening to introduce unbalanced compressive stresses near the surface of the component. These stresses tend to bend the panel and, when optimized, lead to the desired contour. Sheet materials often exhibit both elastic and plastic anisotropy, which can alter the development of curvatures. Since peen forming relies on compressive stresses to upset equilibrium, resulting curvatures may also be affected by initial stresses in the part. In this work, the influence of the rolling direction orientation with respect to the sample was investigated experimentally and numerically for the first time for aluminium alloy 2024-T3 specimens. Although maximum deflections were only slightly dependent on the rolling direction orientation, it was found that radii of curvature varied by as much as 10% with respect to this parameter. Finite element simulations allowed quantification of the individual effects of non-equibiaxial initial stresses and elastic orthotropy. It was found that these factors can significantly influence curvature development. Comparison of experimental and numerical results suggested that plastic anisotropy should also be taken into account in future studies. The tools developed in this study show promises for the accurate prediction of peen forming process for large scale components. © 2013 Elsevier B.V. All rights reserved.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21269858
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Record identifier76a563a8-16c6-4ccb-979c-e14e35529e79
Record created2013-12-13
Record modified2016-05-09
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