An influence of tightening torque stored in tightening process on fatigue strength of aluminum bolts

Shinji Hashimura, Tomohiro Nutahara, Kazuki Kamibeppu

研究成果: Conference contribution

2 被引用数 (Scopus)

抄録

Fatigue strength of bolts has been generally investigated loading only axial cyclic loads on the bolts. However since the bolt is used to be tightened into a internal thread part or a nut, the bolt receives twisting torque due to friction torque between thread torque during tightening. Therefore an influence of the thread torque on the fatigue strength shoud be investigated. In this study, transverse fatigue tests have been conducted because the test can perform the fatigue tests in situations a bolt is tightened. And the transverse fatigue tests loosening the nut slightly to release the thread torque after tightening have been also conducted. Test bolts and nuts were hexagon head bolts M8 and the bolts and the nuts were made of aluminum alloy A5056. The bolt/nut assemblies were lubricated by Molybdenum disulfide grease in the transverse fatigue tests. Results showed that the transverse fatigue strength of bolt/nut assemblies for aluminum alloy bolt decreased by influence of the thread torque. Results also showd that the transverse fatigue strength of bolt/nut assemblies for aluminum alloy bolt could improve 15 % by means of releasing the thread torque.

本文言語English
ホスト出版物のタイトルAdvances in Fracture and Damage Mechanics XVII
編集者Luis Rodriguez-Tembleque, Jaime Dominguez, Ferri M.H. Aliabadi
出版社Trans Tech Publications Ltd
ページ229-234
ページ数6
ISBN(印刷版)9783035713503
DOI
出版ステータスPublished - 2018 1 1
イベント17th International Conference on Fracture and Damage Mechanics, FDM 2018 - Bangkok, Thailand
継続期間: 2018 9 42018 9 6

出版物シリーズ

名前Key Engineering Materials
774 KEM
ISSN(印刷版)1013-9826
ISSN(電子版)1662-9795

Other

Other17th International Conference on Fracture and Damage Mechanics, FDM 2018
国/地域Thailand
CityBangkok
Period18/9/418/9/6

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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