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Metals 2018, 8(8), 651; https://doi.org/10.3390/met8080651

Characterization of Local Residual Stress at Blade Surfaces by the V(z) Curve Technique

1
Key Laboratory of Pressure Systems and Safety, MOE, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
2
College of Aerospace Engineering, Chongqing University, Chongqing 400044, China
*
Author to whom correspondence should be addressed.
Received: 15 June 2018 / Revised: 16 August 2018 / Accepted: 16 August 2018 / Published: 19 August 2018
(This article belongs to the Special Issue Modern Aerospace Materials)
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Abstract

The characterization of residual stress in complicated components is a tough issue. The method of Rayleigh surface wave-based V(z) curve is adopted in this work to evaluate the distribution of residual stresses in aeroengine blades. First, the velocity of Rayleigh surface wave in aeroengine blade was measured by the V(z) curve technique, which can be used to calculate the local residual stress because the change of velocity is thought to be correlated with the contribution from residual stress. Two kinds of plastic-deformed Ti-6Al-4V samples were fabricated by ball-gun shooting to artificially induce distribution of residual stress and then measured by the proposed method. The results indicate that the distribution of the residual stress in both of the samples displays a predictable symmetry. The error of the measured stress is much less than 10% of the yielding stress in Ti-6Al-4V (i.e., about 800 MPa). Finally, the measured residual stresses were verified by X-ray diffraction method, whose results correlate reasonably well with each other. The proposed V(z) curve method and its experimental set-up appear to be a potential in characterizing residual stress at a point-like region, such as in complicated components. View Full-Text
Keywords: residual stresses; V(z) curve; ultrasonic stress measurement; Rayleigh surface wave residual stresses; V(z) curve; ultrasonic stress measurement; Rayleigh surface wave
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Xiang, Y.; Teng, D.; Deng, M.; Li, Y.; Liu, C.; Xuan, F. Characterization of Local Residual Stress at Blade Surfaces by the V(z) Curve Technique. Metals 2018, 8, 651.

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