1. College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310023, China 2. Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Tsinghua University, Beijing 100084, China
A series of the high-cycle constant-amplitude fatigue tests on the non-load-carrying cruciform fillet-welded joints were conducted at room temperature and ?60 °C in order to analyze the fatigue behavior and performance of the welded joints in the steel bridges. The effect mechanism of the low temperature on the fatigue crack propagation life of those joints was analyzed through three-dimensional crack propagation simulation. The experimental results show the marginal effect due to the low temperatures on the S-N fatigue of the cruciform fillet-welded joints. The initial crack-like defects always propagate simultaneously at several sites along the weld toes. The fatigue crack propagation life is affected negligibly by the deteriorated fracture toughness in steel materials induced by the decreasing temperature. Although the resistance to fatigue crack propagation in steel materials is enhanced by the decreasing temperature, the fatigue life of those fillet-welded joints is still dominated by the diverse initial defects produced during the welding processes. Adopting the three-dimensional multi-crack coupled propagation analysis was recommended to predict more accurately the fatigue life of welded joints in the further research.
Fig.1Schematic diagram of non-load-carrying cruciform fillet-welded joints
Fig.2Mean values and standard deviation of fillet weld sizes of cruciform joints
温度
试件编号
Δσ/MPa
N/周
裂纹模式
温度
试件编号
Δσ/MPa
N/周
裂纹模式
?
?
?
?
?
?60 °C
NLL-1
243
180839
1/4椭圆角裂纹
室温
NLR-1
225
207716
边缘贯穿裂纹
?60 °C
NLL-2
225
159224
边缘贯穿裂纹
室温
NLR-2
207
254546
多个半椭圆裂纹
?60 °C
NLL-3
207
308043
边缘贯穿裂纹
室温
NLR-3
189
285802
边缘贯穿裂纹
?60 °C
NLL-4
189
342520
多个半椭圆裂纹
室温
NLR-4
171
310355
边缘贯穿裂纹
?60 °C
NLL-5
171
370673
半椭圆表面裂纹
室温
NLR-5
153
538264
半椭圆表面裂纹
?60 °C
NLL-6
153
423223
边缘贯穿裂纹
室温
NLR-6
135
879401
多个半椭圆裂纹
?60 °C
NLL-7
135
656666
边缘贯穿裂纹
室温
NLR-7
126
1069528
半椭圆表面裂纹
?60 °C
NLL-8
126
1129634
边缘贯穿裂纹
室温
NLR-8
117
1515128
多个半椭圆裂纹
?60 °C
NLL-9
117
1128144
半椭圆表面裂纹
室温
NLR-9
108
1553933
多个半椭圆裂纹
?60 °C
NLL-10
108
1254981
半椭圆表面裂纹
室温
NLR-10
99
2000000
未断
?60 °C
NLL-11
99
1363262
半椭圆表面裂纹
Tab.1Fatigue test results of non-load-carrying cruciform fillet-welded joints
Fig.3Test set-up for low-temperature fatigue tests
Fig.4Fatigued specimens at room and low temperatures
Fig.5Crack growth morphology of fatigued specimens at room and low temperature
Fig.6S-N results at room temperature and −60 °C
Fig.7Three-dimensional crack propagation finite element model for non-load-carrying cruciform fillet-welded joints
Fig.8Comparison of numerical and analytic values of I-mode stress intensity factors
Fig.9Calculation of stress intensity factors for different cracks
Fig.10Comparison of predicted fatigue crack propagation life and test results for cruciform fillet-welded joints
Fig.11Effect of fracture toughness on fatigue crack propagation life of cruciform fillet-welded joints
Fig.12Effect of temperature-depended Paris parameters on fatigue life of cruciform fillet-welded joints
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