Numerical Simulation of the Cold Expansion and Residual Stress Relaxation for Aluminum Alloy 7050

Di Guan; Qin Sun

doi:10.4028/www.scientific.net/AMM.117-119.1656

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 117-119Numerical Simulation of the Cold Expansion and...

Numerical Simulation of the Cold Expansion and Residual Stress Relaxation for Aluminum Alloy 7050

Abstract:

Cold expansion is a well-known technique for improving the fatigue life of fastener holes in aeronautical structures by introducing a compressive residual stress field around them. In this paper, a 3-D finite element model is used to analyze the residual stress distribution and relaxation around an expanded hole for aluminum alloy 7050. The results reveal that the cutting process of split sleeve cold expansion and creep are main reason for residual stress relaxation in room temperature, which may limit the beneficial effects of cold expansion.

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Periodical:

Applied Mechanics and Materials (Volumes 117-119)

Pages:

1656-1661

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.117-119.1656

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Online since:

October 2011

Authors:

Di Guan, Qin Sun

Keywords:

Cold Expansion, Creep, Finite Element Model (FEM), Residual Stress, Stress Relaxation

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