A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Fatigue behaviour of load-carrying fillet-welded cruciform joints of austenitic stainless steel
Abstract Recently, considerable advances have been globally reported on stainless-steel bridges. Fatigue performance is an important design factor. The fatigue damage of stainless-steel bridges mostly occurs in fillet-welded joints, especially in load-carrying fillet-welded (LCFW) cruciform joints. In this study, the fatigue behaviour of LCFW cruciform joints, manifested by fatigue strength, S-N curve, crack shape, fatigue crack growth rate, and the fatigue life predicted method, were investigated. Constant range fatigue and beach-marking fatigue tests were conducted. The fatigue experimental data were regressed to the S-N curve, and were compared with the fatigue classification references from common standards. The crack shape and evolution were studied based on fractographical analysis, and the crack depth and width were then determined. Furthermore, the fatigue crack growth rate and the coefficients of the Paris equation were determined based on crack sizes, and fatigue life was predicted based on fracture mechanics. The results of the fatigue behaviour of LCFW cruciform joints of austenitic stainless steel were as follows: (1) The free slope regression S-N curve is more suitable for the test data. (2) The crack growth rate is lower than that in the structural steel weld and is similar to that of the base metal of structural steel. (3) The fatigue crack of LCFW cruciform joints of austenitic stainless steel is semi-elliptic crack, which is different from that of LCFW structural steel. Semi-elliptic crack has lower stress intensity factor and higher fatigue life. (4) The fatigue strength of the LCFW cruciform joints of austenitic stainless steel (55 MPa) is higher than that of structural steel (36 MPa) according to the Eurocode 3 (EC 3) and International Institute of Welding (IIW) recommendations.
Graphical abstract Display Omitted
Highlights The load-carrying fillet-welded cruciform joints of the austenitic stainless-steel have good fatigue performance and high fatigue strength. The fatigue crack propagation of the weld metal in the load-carrying fillet-welded cruciform joints of austenitic stainless-steel can be lower than that of structural steel welded joints. The fatigue crack shape can be semi-elliptical shape, when the fracture mechanics approach is used to predict the fatigue life for the load-carrying fillet-welded cruciform joints of austenitic stainless-steel.
Fatigue behaviour of load-carrying fillet-welded cruciform joints of austenitic stainless steel
Abstract Recently, considerable advances have been globally reported on stainless-steel bridges. Fatigue performance is an important design factor. The fatigue damage of stainless-steel bridges mostly occurs in fillet-welded joints, especially in load-carrying fillet-welded (LCFW) cruciform joints. In this study, the fatigue behaviour of LCFW cruciform joints, manifested by fatigue strength, S-N curve, crack shape, fatigue crack growth rate, and the fatigue life predicted method, were investigated. Constant range fatigue and beach-marking fatigue tests were conducted. The fatigue experimental data were regressed to the S-N curve, and were compared with the fatigue classification references from common standards. The crack shape and evolution were studied based on fractographical analysis, and the crack depth and width were then determined. Furthermore, the fatigue crack growth rate and the coefficients of the Paris equation were determined based on crack sizes, and fatigue life was predicted based on fracture mechanics. The results of the fatigue behaviour of LCFW cruciform joints of austenitic stainless steel were as follows: (1) The free slope regression S-N curve is more suitable for the test data. (2) The crack growth rate is lower than that in the structural steel weld and is similar to that of the base metal of structural steel. (3) The fatigue crack of LCFW cruciform joints of austenitic stainless steel is semi-elliptic crack, which is different from that of LCFW structural steel. Semi-elliptic crack has lower stress intensity factor and higher fatigue life. (4) The fatigue strength of the LCFW cruciform joints of austenitic stainless steel (55 MPa) is higher than that of structural steel (36 MPa) according to the Eurocode 3 (EC 3) and International Institute of Welding (IIW) recommendations.
Graphical abstract Display Omitted
Highlights The load-carrying fillet-welded cruciform joints of the austenitic stainless-steel have good fatigue performance and high fatigue strength. The fatigue crack propagation of the weld metal in the load-carrying fillet-welded cruciform joints of austenitic stainless-steel can be lower than that of structural steel welded joints. The fatigue crack shape can be semi-elliptical shape, when the fracture mechanics approach is used to predict the fatigue life for the load-carrying fillet-welded cruciform joints of austenitic stainless-steel.
Fatigue behaviour of load-carrying fillet-welded cruciform joints of austenitic stainless steel
Peng, Yang (author) / Dai, Zhen (author) / Chen, Jie (author) / Ju, Xiaochen (author) / Dong, Jun (author)
2021-06-05
Article (Journal)
Electronic Resource
English
Fatigue analysis of non-load-carrying fillet welded cruciform joints
| British Library Online Contents | 2007
Fatigue Strength Evaluation Method for Load-Carrying Fillet Welded Cruciform Joints
| British Library Online Contents | 1994
A fatigue strength evaluation method for load-carrying fillet welded cruciform joints
| British Library Online Contents | 2006
Numerical analysis on fatigue failure modes in load-carrying fillet welded cruciform joints
| British Library Conference Proceedings | 2001
A study on fatigue crack initiation point of load-carrying fillet welded cruciform joints
| British Library Online Contents | 2008