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Title: Shot Peening On Torsion Fatigue
Author: J. He, Y. Wu, Y. Yu, J. Flavenot
Source: Conf Proc: ICSP-3, (p.619-624)
Publication year 1987
Document number: 1987086
Number of pages: 6
Abstract:
The effect of shot peening on bending fatigue has been well documented. Compressive residual stress, work hardening and surface topography are of major factors which
influence the bending fatigue strength. When a crack initiates in the sub-surface layer, surface topography will be less important and the compressive residual stress may
keep the crack from going through the outer layer to the vary surface.
F
or torsion fatigue, the loading stress is shear stress. Since the mean
stress during cyclic torsion does not change the fatigue strength, naturally, the biaxial compressive residual stress induced by shot peening are thought to be of little
effect on torsion fatigue strength.
M
ost papers claimed that hardness is the only factor which influences to
the torsion fatigue behaviour. But the experimental facts show that the fatigue strength of spiral spring, which is mainly under torsion load, can be greatly improved by
shot peening with no much change in hardness. This paper trys to clarify the effect of biaxial compressive residual stress on reverse torsion fatigue limit.
P
resetting is often employed in spiral spring manufacturing, and
prestrain is proved to be beneficial for bending fatigue, but for torsion it needs to be clarified. So prestrain was also carried out to examine its effect on torsion
fatigue behaviour.
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