Investigation on the fretting fatigue behaviors of Ti-6Al-4V dovetail joint specimens treated with shot-peening

Abstract The shot-peening (SP) and ultrasonic surface rolling process (USRP) were performed on Ti–6Al-4V plate specimens. The surface hardness and residual stresses of the material were tested by vickers indenter and X-ray diffraction residual stress analyzer. The effects of different surface strengthening on its fretting fatigue properties were verified by fretting fatigue experiments. It is shown (i) that the fretting fatigue life of Ti–6Al-4V effectively improved after USRP and SP and（ii）that the surface integrity of specimens after USRP is the best, which has deeper residual compressive stress layer and more refined grain. The fretting fatigue fracture surface and wear morphology of the samples were studied and analyzed by means of microscopic observation, and the mechanism of improving fretting fatigue life by surface strengthening process was further explained

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The effect of shot-peening on the fretting fatigue behaviour of an austenitic stainless steel and a mild steel

Wear ◽

10.1016/0043-1648(79)90090-5 ◽

1979 ◽

Vol 53 (2) ◽

pp. 381-386 ◽

Cited By ~ 9

Author(s):

R.B. Waterhouse ◽

D.A. Saunders

Keyword(s):

Stainless Steel ◽

Austenitic Stainless Steel ◽

Mild Steel ◽

Shot Peening ◽

Fatigue Behaviour ◽

Fretting Fatigue

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Fretting-Fatigue Analysis of Shot-Peened Al 7075-T651 Test Specimens

Metals ◽

10.3390/met9050586 ◽

2019 ◽

Vol 9 (5) ◽

pp. 586 ◽

Cited By ~ 2

Author(s):

Vicente Martín ◽

Jesús Vázquez ◽

Carlos Navarro ◽

Jaime Domínguez

Keyword(s):

Fatigue Life ◽

Residual Stresses ◽

Shot Peening ◽

Normal Load ◽

Fretting Fatigue ◽

Fatigue Tests ◽

Material Surface ◽

Tangential Load ◽

Bulk Stress ◽

Al 7075

Shot peening is a mechanical treatment that induces several changes in the material: surface roughness, increased hardness close to the surface, and, the most important, compressive residual stresses. This paper analyzes the effect of this treatment on alloy Al 7075-T651 in the case of fretting fatigue with cylindrical contact through the results of 114 fretting fatigue tests. There are three independent loads applied in this type of test: a constant normal load N, pressing the contact pad against the specimen; a cyclic bulk stress σ in the specimen; and a cyclic tangential load Q through the contact. Four specimens at each of 23 different combinations of these three parameters were tested—two specimens without any treatment and two treated with shot peening. The fatigue lives, contact surface, fracture surface, and residual stresses and hardness were studied. Improvement in fatigue life ranged from 3 to 22, depending on fatigue life. The relaxation of residual-stress distribution related to the number of applied cycles was also measured. Finally, another group of specimens treated with shot peening was polished and tested, obtaining similar lives as in the tests with specimens that were shot-peened but not polished.

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