Improving Fatigue Strength of Aerospace Metal Fasteners by Surface Work Hardening

1985 ◽  
Vol 1 (1) ◽  
pp. 17-22 ◽  
Author(s):  
G Turlach
Keyword(s):  
Fatigue Strength ◽  
Work Hardening ◽  
Surface Work

Effectiveness of surface work-hardening as a means of increasing the fatigue and corrosion-fatigue strength of some stainless steels

1968 ◽  
Vol 2 (6) ◽  
pp. 468-470
Author(s):  
V. I. Pokhmurskii ◽  
A. V. Boltarovich ◽  
M. M. Shved ◽  
G. V. Karpenko
Keyword(s):  
Fatigue Strength ◽  
Corrosion Fatigue ◽  
Stainless Steels ◽  
Work Hardening ◽  
Corrosion Fatigue Strength ◽  
Surface Work

Surface work-hardening of back-up rolls

Metallurgist ◽  
1982 ◽  
Vol 26 (1) ◽  
pp. 32-33
Author(s):  
A. Yu. Firkovich ◽  
A. M. Tsun ◽  
A. I. Dobronravov ◽  
V. A. Brovkin ◽  
O. N. Shcherbakov
Keyword(s):  
Work Hardening ◽  
Surface Work

Effect of Plastic Working on Fatigue Properties of Ti-6Al-4V Alloy with Notch

2005 ◽  
Vol 297-300 ◽  
pp. 2513-2518
Author(s):  
Nobusuke Hattori ◽  
Shinichi Nishida ◽  
Masahiro Hara ◽  
Sun Young Son
Keyword(s):  
Fatigue Strength ◽  
Fatigue Limit ◽  
Work Hardening ◽  
Fatigue Cracks ◽  
Fatigue Properties ◽  
Plastic Working

This study is focused to the effects of plastic working on the fatigue strength of Ti-6Al-4V alloy with notch. In general, the fatigue strength of plastic worked specimen is higher than that of non-worked one. However, the potential of hardening ability of Ti-6Al-4V alloy is very limited. Accordingly, the effect of work hardening on fatigue strength about this material is very small. In addition, the surface of the worked part becomes rougher with increasing plastic deformed value and the fatigue cracks initiate at this part. Consequently, the fatigue limit of the plastic worked specimen is lower than that of the non-plastic-worked one.

scholarly journals Surface work hardening of pure niobium induced by water polishing.

2000 ◽  
Vol 12 (1/2) ◽  
pp. 109-110
Author(s):  
Naotada HAGIWARA ◽  
Kazuya OGURI ◽  
Tsunenori SUZUKI ◽  
Haru-Hisa UCHIDA ◽  
Hiromasa YABE ◽  
...  
Keyword(s):  
Work Hardening ◽  
Pure Niobium ◽  
Surface Work

Evaluation of the Fatigue Limit for Notched Parts Considering the Influences of Work Hardening and Residual Stress by Cold Working

2006 ◽  
Vol 306-308 ◽  
pp. 145-150
Author(s):  
Sheng Wu Wang ◽  
Ai Ling Wen ◽  
Shinichi Nishida ◽  
Nobusuke Hattori
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Work Hardening ◽  
Cold Working ◽  
Structural Components ◽  
Notched Specimen ◽  
Mechanical Parts ◽  
Die Pressing ◽  
Method Of Evaluation ◽  
Good Agreement

Nearly 90% of failures of machines and mechanical parts are caused at the area of stress concentrated in the structural components [1]. Hence, it is important to investigate the method of improving fatigue strength for notched parts, and method of evaluation the fatigue strength of notched parts for mechanical engineering. In this paper, the tests were carried out for improving the fatigue strength of specimens, with the hole notches that have been chamfered by die-pressing. The fatigue strength of notched part is enhanced to around 100% by die-pressing, comparing with notched specimen without die-pressing. Based on the above results, the new method for evaluation the fatigue strength with both the effects of work hardening and residual stress caused by the cold working. The estimated results by the method revealed good agreement with the tested results.

Effect of pre-strain on the fatigue behavior of SAPH440 steel

2019 ◽  
Vol 9 (9) ◽  
pp. 1001-1008 ◽  
Author(s):  
Li-Hui Zhao ◽  
Hong-Chang Cai ◽  
Shuo Weng ◽  
Song-Lin Zheng
Keyword(s):  
Fatigue Strength ◽  
Dislocation Density ◽  
Work Hardening ◽  
Fatigue Behavior ◽  
Static Strength ◽  
Fatigue Properties ◽  
Uniaxial Tensile ◽  
Test Results ◽  
Transmission Electron ◽  
Static Tensile

The present research envisages the effects of different uniaxial tensile pre-strain levels on the fatigue properties of the SAPH440 steel. The S-N curves of different pre-strain levels (0%, 6%, 12%, 18%) were drawn using different load levels, with a stress ratio R = –1. The test results show that the fatigue strength of the SAPH440 steel increased with an increasement in the uniaxial tensile pre-strain levels. The static tensile test was carried out on different uniaxial tensile and different pre-strain levels specimens. The results show that with an increase in the uniaxial tensile pre-strain levels, the degree of work hardening of the SAPH440 steel and the static strength increased. Additionally, the hardening index and the elongation at break reduced, while the tensile strength and yield strength increased. TEM (Transmission Electron Microscopy) observation of the test samples with different pre-strain levels showed that the dislocation density of different pre-strain levels specimens increased with an increasement in the pre-strain levels. This resulted in an increasement in the fatigue strength of the SAPH440 steel, the degree of work hardening, and the static strength. However, compared with fatigue strength, the increase of dislocation density has a more significant effect on static strength.

Sign in / Sign up

Export Citation Format

Share Document