Effect of Shot Peening Coverage on Fatigue Strengths of Steels and Aluminum Alloy

2015 ◽  
Vol 1102 ◽  
pp. 33-36
Author(s):  
Junji Sakamoto ◽  
Yong Sung Lee ◽  
Seong Kyun Cheong
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Strength ◽  
Shot Peening ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Carbon Steels ◽  
Medium Carbon Steels ◽  
Negative Effect ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

The relations between shot peening coverage and fatigue strength in the quenched-tempered and annealed medium-carbon steels and aluminum alloy A7075-T6 were experimentally studied using a rotating bending fatigue testing machine. It was found that the fatigue strengths of the annealed steel and aluminum alloy were increased by shot peening. On the other hand, the fatigue strength of the quenched-tempered steel were not increased by shot peening. Same shot peening condition causes the positive effect and the negative effect depending on the type of material. Moreover, the valuable coverage might depend on the type of material. More detailed work is necessary to resolve the issue.

Improvement of Fatigue Strength of Aluminum Alloy by Cavitation Shotless Peening

2002 ◽  
Vol 124 (2) ◽  
pp. 135-139 ◽  
Author(s):  
Hitoshi Soyama ◽  
Kenichi Saito ◽  
Masumi Saka
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Strength ◽  
Shot Peening ◽  
High Speed ◽  
Bending Fatigue ◽  
Hydraulic Machinery ◽  
Bending Fatigue Test ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Cavitation Shotless Peening

Cavitation impact, which normally produces severe damage in hydraulic machinery, can be used to modify surfaces in the same way as shot peening. Cavitation impact enables the surface of a material to be peened without the use of shot, thus it is called cavitation shotless peening. As there are no solid body collisions occurring in this peening process, the roughness of the peened surface should be less than that produced by shot peening. This characteristic makes it suitable for peening soft metals. In order to demonstrate the improvement of the fatigue strength of aluminum alloy by this process, specimens were subjected to the process, and then tested in a rotating bending fatigue test. Cavitation impacts were produced and controlled by using a submerged high speed water jet with cavitation, i.e., a cavitating jet. It was revealed that the fatigue strength of an aluminum alloy specimen treated by this peening process was 50% stronger than that of a specimen without peening.

Effects of Roller Working and Ion Nitriding on Fatigue Properties of Eutectoid Steel

2007 ◽  
Vol 340-341 ◽  
pp. 519-524
Author(s):  
Mian Zhang ◽  
Shinichi Nishida ◽  
Nobusuke Hattori ◽  
Wen Xian Sun
Keyword(s):  
Fatigue Strength ◽  
Fatigue Test ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Surface Hardness ◽  
Fatigue Properties ◽  
Eutectoid Steel ◽  
Ion Nitriding ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

In this study, the authors have investigated and compared the effects of roller working and ion nitriding on fatigue properties of eutectoid steel. Five kinds of roller worked and two kinds of ion nitrided specimens were used in this test. The fatigue test was performed using a rotating bending fatigue testing machine to evaluate the fatigue strength of roller worked and ion nitrided eutectoid steel. The fatigue test result shows that roller working is more effective on improving the fatigue strength of the material than ion nitriding. On the other hand, the ion nitriding can much greatly increase the surface hardness than the roller working. In the case of roller working, the fatigue properties are improved by the three main factors which are compressive residual stress, work hardening and fiberized micro-structure.

On a New Rotating Bending Fatigue Testing Machine

1966 ◽  
Vol 15 (148) ◽  
pp. 49-54
Author(s):  
Minoru KAWAMOTO ◽  
Katsumi SUMIHIRO ◽  
Koji KIDA
Keyword(s):  
Fatigue Testing ◽  
Testing Machine ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

scholarly journals A Newly Devised Resonance Type Rotating Bending Fatigue Testing Machine and Some Fatigue Tests

1971 ◽  
Vol 14 (76) ◽  
pp. 1013-1020
Author(s):  
Minoru KAWAMOTO ◽  
Yukihiko IBUKI ◽  
Toshinobu SHIBATA ◽  
Hiroshi ISHIKAWA
Keyword(s):  
Fatigue Testing ◽  
Testing Machine ◽  
Fatigue Tests ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

scholarly journals Design and fabrication of dual specimen rotating bending fatigue testing machine

IARJSET ◽  
2015 ◽  
pp. 25-27 ◽  
Author(s):  
Shreyas P ◽  
Trishul M.A ◽  
Chethan Kumar R ◽  
Karthik Babu K.R
Keyword(s):  
Fatigue Testing ◽  
Testing Machine ◽  
Bending Fatigue ◽  
Rotating Bending Fatigue ◽  
Rotating Bending

Effect of Tensile Prestrain on Fatigue Strength of Aluminum Alloy in High Cycle Fatigue

1973 ◽  
Vol 95 (2) ◽  
pp. 76-82 ◽  
Author(s):  
P. R. Arora ◽  
M. R. Raghavan
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Strength ◽  
Fatigue Loading ◽  
Cyclic Stress ◽  
Stress Strain ◽  
Static Modulus ◽  
Material Condition ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Inelastic Region

The effect of tensile prestrain on rotating bending fatigue strength of B51-S aluminum alloy in the solution treated and precipitation hardened condition, has been studied at fatigue life in the range of 5 × 104 to 106 cycles. The fatigue strength decreases when the tensile prestrain is 1.5 percent. At a higher prestrain of 3 to 4 percent, fatigue strength is close to that of virgin material. The cyclic stress-strain curves for virgin and prestrained materials are linear. There is no perceptible strain hardening/strain softening of the material under fatigue loading. The cyclic Young’s modulus is about 4 percent lower than the static modulus irrespective of the material condition. The relative disposition of static bending stress-strain curves in the inelastic region for virgin and prestrained materials shows qualitatively the relative disposition of the corresponding S-N curves.

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