Fretting fatigue tests on leaf springs and small axial-loading specimens were carried out under constant loading and random loading simulating field load spectra. The results for leaf springs were compared with literature data on similar springs. The behavior of fretting fatigue crack initiation and propagation in the leaf springs was found to be almost the same as in the small laboratory specimen. No significant differences between their fretted surfaces and also between their fatigue fracture surfaces were observed. Random loading reduced the fretting fatigue lives by a factor of 1.5. The effect of shot peening on fretting fatigue was also investigated. Shot peening improved the fretting fatigue strengths in both specimens by a factor of two. The residual compressive stresses induced by the shot peening process were responsible for the improvement. It is suggested that the fretting fatigue life of leaf springs can be estimated from that of laboratory specimens, provided the clamping pressures and the relative slip amplitudes of both are of the same magnitude.
Fretting fatigue of automotive leaf spring
Dauerfressfestigkeit von Automobilblattfedern
Fatigue of Engng. Materials and Structures. I Mech E Conf. ; 9,1 , Sep ; 203-209
1986
7 Seiten, 12 Bilder, 2 Tabellen, 12 Quellen
Conference paper
English
The Effects of Shot Peening on Fatigue Life of Automotive Leaf Spring
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