scholarly journals Diode Laser Weld Toe Re-melting as a Means of Fatigue Strength Improvement in High Strength Steels

2013 ◽  
Vol 66 ◽  
pp. 171-180 ◽  
Author(s):  
Christoph Gerritsen ◽  
Sofie Vanrostenberghe ◽  
Matthew Doré
Keyword(s):  
Fatigue Strength ◽  
Diode Laser ◽  
High Strength Steels ◽  
High Strength ◽  
Laser Weld ◽  
Fatigue Strength Improvement ◽  
Weld Toe ◽  
Strength Improvement

scholarly journals Weld toe modification using spherical-tip WC tool FSP in fatigue strength improvement of high-strength low-alloy steel joints

2018 ◽  
Vol 160 ◽  
pp. 1019-1028 ◽  
Author(s):  
Hajime Yamamoto ◽  
Yoshikazu Danno ◽  
Kazuhiro Ito ◽  
Yoshiki Mikami ◽  
Hidetoshi Fujii
Keyword(s):  
Fatigue Strength ◽  
Alloy Steel ◽  
High Strength ◽  
Low Alloy Steel ◽  
Fatigue Strength Improvement ◽  
Weld Toe ◽  
Steel Joints ◽  
Strength Improvement

scholarly journals Fatigue Strength Improvement Methods by Treating the Weld Toe.

1999 ◽  
Vol 17 (1) ◽  
pp. 111-119 ◽  
Author(s):  
Chitoshi MIKI ◽  
Kengo ANAMI ◽  
Hideki TANI ◽  
Ichiro SUGIMOTO
Keyword(s):  
Fatigue Strength ◽  
Fatigue Strength Improvement ◽  
Weld Toe ◽  
Strength Improvement

3106 Examination for the Fatigue Strength Improvement of the High Strength Bolt/Nut Joint

2013 ◽  
Vol 2013 (0) ◽  
pp. 179-182
Author(s):  
Yasushi TAKASE ◽  
Xin CHEN ◽  
Hikaru MARUYAMA ◽  
Huan WANG ◽  
Nao-Aki NODA ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
High Strength ◽  
High Strength Bolt ◽  
Fatigue Strength Improvement ◽  
Strength Improvement

Residual Stress Reduction and Fatigue Strength Improvement by Controlling Welding Pass Sequences

1999 ◽  
Vol 122 (1) ◽  
pp. 108-112 ◽  
Author(s):  
Masahito Mochizuki ◽  
Toshio Hattori ◽  
Kimiaki Nakakado
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Stress Reduction ◽  
Stress Amplitude ◽  
High Stress ◽  
Initial Residual Stress ◽  
Fatigue Strength Improvement ◽  
Weld Toe ◽  
Goodman Diagram ◽  
Strength Improvement

The effects of residual stress on fatigue strength at a weld toe in a multi-pass fillet weld joint were evaluated. The residual stresses in the weld joints were varied by controlling the sequence of welding passes. The residual stress at the weld toe was 80 MPa in the specimen whose last welding pass was on the main plate side, but it was 170 MPa in the specimen whose last pass was on the attachment side. The fatigue strength was nearly the same at high stress amplitude for both specimens, but the fatigue strength of the specimen whose last weld pass on the main plate was higher than that of the other specimen at low stress amplitude. This difference is due to the magnitude of the initial residual stress and the relaxation of the residual stress under fatigue cycling. The effects of the residual stress were shown in a modified Goodman diagram, in which residual stress is treated as a mean stress. [S0094-4289(00)01701-1]

Effects of root radius and pitch difference on fatigue strength and anti-loosening performance for high strength bolt–nut connections

2021 ◽  
pp. 136943322098861
Author(s):  
Nao-Aki Noda ◽  
Biao Wang ◽  
Kazuhiro Oda ◽  
Yoshikazu Sano ◽  
Xi Liu ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Crack Initiation ◽  
Fatigue Limit ◽  
High Strength ◽  
Root Radius ◽  
Fatigue Strength Improvement ◽  
Prevailing Torque ◽  
Final Failure ◽  
Pitch Difference ◽  
Strength Improvement

The fatigue strength improvement and anti-loosening performance are studied experimentally and analytically for JIS M16 bolt–nut connections. Three different root radii are considered coupled with three different pitch differences. The enlarging the bolt root radius improves the fatigue limit of the bolt by more than 30% because both stress amplitude and mean stress can be reduced. Furthermore, suitable pitch difference improves the fatigue limit by more than 25%. This is because under no pitch difference the crack initiation always occurs at No.1 or No.2 threads close to the bolt head causing the final failure; however, under a suitable pitch difference the crack initiation occurs at No.6 or No.7 threads far away from the bolt head. Good anti-loosening performance can be expected for the bolt–nut connections having enlarged root radius because the prevailing torque [Formula: see text] = 19 Nm and the residual prevailing torque [Formula: see text] are not smaller compared to other special bolt–nut connections.

Sign in / Sign up

Export Citation Format

Share Document