Abstract
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.
| Original language | English |
|---|---|
| Title of host publication | Advances in Fracture and Damage Mechanics XVII |
| Editors | Ferri M.H. Aliabadi, Luis Rodriguez-Tembleque, Jaime Dominguez |
| Publisher | Trans Tech Publications Ltd |
| Pages | 229-234 |
| Number of pages | 6 |
| ISBN (Print) | 9783035713503 |
| DOIs | |
| Publication status | Published - 2018 Jan 1 |
| Event | 17th International Conference on Fracture and Damage Mechanics, FDM 2018 - Bangkok, Thailand Duration: 2018 Sep 4 → 2018 Sep 6 |
Publication series
| Name | Key Engineering Materials |
|---|---|
| Volume | 774 KEM |
| ISSN (Print) | 1013-9826 |
Other
| Other | 17th International Conference on Fracture and Damage Mechanics, FDM 2018 |
|---|---|
| Country | Thailand |
| City | Bangkok |
| Period | 18/9/4 → 18/9/6 |
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Keywords
- Aluminum alloy bolt
- Thread torque
- Tightening torque
- Transverse fatigue
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
Cite this
An influence of tightening torque stored in tightening process on fatigue strength of aluminum bolts. / Hashimura, Shinji; Nutahara, Tomohiro; Kamibeppu, Kazuki.
Advances in Fracture and Damage Mechanics XVII. ed. / Ferri M.H. Aliabadi; Luis Rodriguez-Tembleque; Jaime Dominguez. Trans Tech Publications Ltd, 2018. p. 229-234 (Key Engineering Materials; Vol. 774 KEM).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - An influence of tightening torque stored in tightening process on fatigue strength of aluminum bolts
AU - Hashimura, Shinji
AU - Nutahara, Tomohiro
AU - Kamibeppu, Kazuki
PY - 2018/1/1
Y1 - 2018/1/1
N2 - 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.
AB - 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.
KW - Aluminum alloy bolt
KW - Thread torque
KW - Tightening torque
KW - Transverse fatigue
UR - http://www.scopus.com/inward/record.url?scp=85053071135&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85053071135&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/KEM.774.229
DO - 10.4028/www.scientific.net/KEM.774.229
M3 - Conference contribution
SN - 9783035713503
T3 - Key Engineering Materials
SP - 229
EP - 234
BT - Advances in Fracture and Damage Mechanics XVII
A2 - Aliabadi, Ferri M.H.
A2 - Rodriguez-Tembleque, Luis
A2 - Dominguez, Jaime
PB - Trans Tech Publications Ltd
ER -