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Bending fatigue strengths/limits of smooth specimens with and without surface‐enhanced layer of aeronautical metallic alloys

Bending fatigue strengths/limits of smooth specimens with and without surface‐enhanced layer of... Purpose – The purpose of this paper is to estimate the bending fatigue strengths/limits of smooth specimens and to quantitatively analyze the effects of residual stresses caused by surface enhancements. Design/methodology/approach – Rotating bending and three‐point bending fatigue tests were employed to investigate the effects of surface enhancements including shot peening and laser peening on fatigue strengths/limits of smooth specimens. The fatigue sources were determined by scanning electron microscopy (SEM). Findings – The two new concepts of surface fatigue strength/limit and subsurface fatigue strength/limit were proposed based on experimental results and the relationship of surface fatigue strength/limit to subsurface fatigue strength/limit was built. Research limitations/implications – This paper provides the estimation that fatigue strengths/limits of surface‐enhanced specimens is 1.34‐1.42 times that of un‐surface‐strengthened specimens for smooth ones without stress concentration. Originality/value – Based on the present investigation and analysis, an analysis for fatigue strengths/limits of surface‐enhanced smooth specimens can be used to design engineering components, particularly in the applications of aircraft industry. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Structural Integrity Emerald Publishing

Bending fatigue strengths/limits of smooth specimens with and without surface‐enhanced layer of aeronautical metallic alloys

International Journal of Structural Integrity , Volume 2 (3): 9 – Aug 30, 2011

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Publisher
Emerald Publishing
Copyright
Copyright © 2011 Emerald Group Publishing Limited. All rights reserved.
ISSN
1757-9864
DOI
10.1108/17579861111162941
Publisher site
See Article on Publisher Site

Abstract

Purpose – The purpose of this paper is to estimate the bending fatigue strengths/limits of smooth specimens and to quantitatively analyze the effects of residual stresses caused by surface enhancements. Design/methodology/approach – Rotating bending and three‐point bending fatigue tests were employed to investigate the effects of surface enhancements including shot peening and laser peening on fatigue strengths/limits of smooth specimens. The fatigue sources were determined by scanning electron microscopy (SEM). Findings – The two new concepts of surface fatigue strength/limit and subsurface fatigue strength/limit were proposed based on experimental results and the relationship of surface fatigue strength/limit to subsurface fatigue strength/limit was built. Research limitations/implications – This paper provides the estimation that fatigue strengths/limits of surface‐enhanced specimens is 1.34‐1.42 times that of un‐surface‐strengthened specimens for smooth ones without stress concentration. Originality/value – Based on the present investigation and analysis, an analysis for fatigue strengths/limits of surface‐enhanced smooth specimens can be used to design engineering components, particularly in the applications of aircraft industry.

Journal

International Journal of Structural IntegrityEmerald Publishing

Published: Aug 30, 2011

Keywords: Fatigue; Residual stresses; Smooth specimens; Local strength; Alloys; Surface properties of materials

References