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

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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.

Info:

Periodical:

Advanced Materials Research (Volumes 160-162)

Edited by:

Guojun Zhang and Jessica Xu

Pages:

241-246

DOI:

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

Citation:

Y. H. Hu et al., "Surface Yield Strength Gradient versus Residual Stress Relaxation of 7075 Aluminum Alloy", Advanced Materials Research, Vols. 160-162, pp. 241-246, 2011

Online since:

November 2010

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$38.00

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