A Study of Self-Loosening and Fatigue Failure of Bolted Joint under Transverse Vibration - Influences of Property Class of Bolt and Plastic Region Tightening

2007 ◽  
pp. 2037-2040 ◽  
Author(s):  
Shinji Hashimura
Keyword(s):  
Fatigue Failure ◽  
Transverse Vibration ◽  
Plastic Region ◽  
Bolted Joint

A Study of Self-Loosening and Fatigue Failure of Bolted Joint under Transverse Vibration - Influences of Property Class of Bolt and Plastic Region Tightening

2007 ◽  
Vol 353-358 ◽  
pp. 2037-2040 ◽  
Author(s):  
Shinji Hashimura
Keyword(s):  
Fatigue Limit ◽  
Fatigue Failure ◽  
Transverse Vibration ◽  
Plastic Region ◽  
Fatigue Tests ◽  
Bolted Joints ◽  
Bolted Joint ◽  
Transverse Vibrations ◽  
Fatigue Characteristics ◽  
Long Life

In our previous study, loosening-fatigue tests under small transverse vibrations had been performed to elucidate bolt behavior and loosening-fatigue mechanism in the long life region. In this study, the influences of bolt property class and the plastic region tightening on loosening-fatigue characteristics under transverse vibration have been investigated. Result shows that bolt property class has little influence on the loosening-fatigue limits under transverse vibration. Result also shows that the transverse loosening-fatigue limit of the bolt which has been tightened to within the plastic region is lower than the transverse loosening-fatigue limit of the bolt that has been tightened to within the elastic region. This result is the opposite of the result of the axial fatigue characteristics of bolted joints.

2939 A Study of Self-Loosening and Fatigue Failure of Bolt and Nut Joints under Transverse Vibration

2007 ◽  
Vol 2007.4 (0) ◽  
pp. 63-64
Author(s):  
Shinji HASHIMURA ◽  
Shunsuke INOUE ◽  
Tomohiro FURUKAWA ◽  
Yoshihiko MORI
Keyword(s):  
Fatigue Failure ◽  
Transverse Vibration

Transverse Vibration Testing Research for 6.8 Grades Bolted Joint Used on Transmission Tower

2013 ◽  
Vol 470 ◽  
pp. 567-571
Author(s):  
Xiao Hao Dai ◽  
Yan Ting Feng ◽  
Xiao Guang Niu ◽  
Hui Fan ◽  
Qiang Wang ◽  
...  
Keyword(s):  
Transverse Vibration ◽  
Decisive Role ◽  
Bolted Joint ◽  
Transmission Tower ◽  
Vibration Testing ◽  
Second Stage ◽  
Reduced Rate ◽  
Test Result

Five groups of vibration experiments were carried out on the 6.8 grades and M20 bolts and nuts that used on transmission tower. The test result shows that the basic way to improve the anti-loosening property was increasing the initial preload. Both increasing initial torque and appending lubrication can obviously increase the initial preload, however appending lubrication may reduce it's anti-loosening property under the situation of same preload. In the vibrating process the second stage plays a decisive role for anti-loosening property, it can be expressed as reduced rate “K” of the preload.

Fatigue Characteristics of Bolted Joint under Transverse Vibration ~Influence of Bolt Tightening Conditions on Transverse Fatigue Strength~

2010 ◽  
Vol 452-453 ◽  
pp. 609-612
Author(s):  
Shinji Hashimura ◽  
YU Kurakake ◽  
Shinichi Umeno
Keyword(s):  
Fatigue Strength ◽  
Fatigue Limit ◽  
Transverse Vibration ◽  
Bending Moment ◽  
Fatigue Tests ◽  
Bolted Joint ◽  
The Real ◽  
Thread Length ◽  
Fatigue Characteristics

Fatigue tests under transverse vibration were performed for three separate tightening conditions to investigate the grip length and the engaging thread length in this study. The relationships between the apparent fatigue limit (the highest amplitude of transverse vibration force which can be applied to the bolted joint without generating fatigue) and the real fatigue limit of bolt material also were investigated. Results showed that apparent transverse fatigue limit decreased if the grip length was long. And relationships of the apparent fatigue limit and the real fatigue limit were different in each tightening conditions depending on the bending moment at the root of the first thread.

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