Surface Yield Strength Gradient versus Residual Stress Relaxation of 7075 Aluminum Alloy

Yong Hui Hu; Yun Xin Wu; Guang Yu Wang; Jun Kang Guo

doi:10.4028/www.scientific.net/AMR.160-162.241

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 160-162Surface Yield Strength Gradient versus Residual...

Surface Yield Strength Gradient versus Residual Stress Relaxation of 7075 Aluminum Alloy

Abstract:

Different distributed residual stresses were introduced by quenching and two shot-peening treatments on 7075 aluminum alloy. The residual stress distributions and micro-hardness profiles in surface layers were measured. Pre-stress coefficient characterizing contribution of local residual stresses to local yield strength is introduced to analyze residual stress relaxation under cyclic loading. Load testing shows that re-distribution of residual stresses and proportional decrease of the pre-stress coefficient would occur in the non-uniform structural residual stresses introduced by quenching, while great stress relaxation and non-linear decrease of the pre-stress coefficient would occur in the uniform surface residual stresses introduced by shot-peening. Additionally, advantages of surface compressive residual stress and micro yield strength on anti-fatigue property and on restraining initiation and propagation of surface micro cracks should be considered in the usually conservative engineering design.

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Periodical:

Advanced Materials Research (Volumes 160-162)

Pages:

241-246

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.160-162.241

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Online since:

November 2010

Authors:

Yong Hui Hu, Yun Xin Wu, Guang Yu Wang, Jun Kang Guo

Keywords:

Gradient, Pre-Stress Coefficient, Stress Relaxation, Yield Strength

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