Fatigue performance of non-load-carrying cruciform fillet-welded joints at low ambient temperature

doi:10.3785/j.issn.1008-973X.2020.10.020

Journal of ZheJiang University (Engineering Science)

2020, Vol. 54

Issue (10): 2018-2026 DOI: 10.3785/j.issn.1008-973X.2020.10.020

Fatigue performance of non-load-carrying cruciform fillet-welded joints at low ambient temperature

Xiao-wei LIAO1,2(

),Yuan-qing WANG2,*(

),Jian-guo WU1,Yong-jiu SHI2

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

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Abstract

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.

Key words： bridge steel cruciform fillet-welded joint low–temperature fatigue crack propagation fracture mechanics

Received: 14 October 2019 Published: 28 October 2020

CLC:

U 441

Corresponding Authors: Yuan-qing WANG E-mail: liaoxiaowei@zjut.edu.cn;wang-yq@mail.tsinghua.edu.cn

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Cite this article:

Xiao-wei LIAO,Yuan-qing WANG,Jian-guo WU,Yong-jiu SHI. Fatigue performance of non-load-carrying cruciform fillet-welded joints at low ambient temperature. Journal of ZheJiang University (Engineering Science), 2020, 54(10): 2018-2026.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2020.10.020 OR http://www.zjujournals.com/eng/Y2020/V54/I10/2018

低温环境下十字形非传力角焊缝接头的疲劳性能

为了研究低温环境下钢桥焊接细节的疲劳行为和性能，以典型的十字形非传力角焊缝接头为对象，开展室温和?60 °C下的高周常幅疲劳试验；基于三维裂纹扩展数值模拟，分析低温对该焊接细节疲劳裂纹扩展寿命的影响机理. 结果表明，该焊接细节的室温和?60 °C条件下试验S-N疲劳寿命未表现出显著区别，初始焊接缺陷裂纹会在细节焊趾处的多个位置同时扩展；由低温环境导致的钢材断裂韧性的降低不会对该焊接细节的疲劳寿命产生明显影响. 虽然低温会增强钢材抵抗疲劳裂纹扩展的能力，但是该焊接细节的疲劳寿命主要受焊接过程产生的多样化初始裂纹缺陷因素控制；建议采用考虑多裂纹耦合扩展的三维裂纹扩展数值模拟来更加精确地预测疲劳裂纹扩展寿命.

关键词： 桥梁钢材, 十字形焊接接头, 低温疲劳, 裂纹扩展, 断裂力学

Fig.1 Schematic diagram of non-load-carrying cruciform fillet-welded joints

Fig.2 Mean values and standard deviation of fillet weld sizes of cruciform joints

Tab.1 Fatigue test results of non-load-carrying cruciform fillet-welded joints

Fig.3 Test set-up for low-temperature fatigue tests

Fig.4 Fatigued specimens at room and low temperatures

Fig.5 Crack growth morphology of fatigued specimens at room and low temperature

Fig.6 S-N results at room temperature and −60 °C

Fig.7 Three-dimensional crack propagation finite element model for non-load-carrying cruciform fillet-welded joints

Fig.8 Comparison of numerical and analytic values of I-mode stress intensity factors

Fig.9 Calculation of stress intensity factors for different cracks

Fig.10 Comparison of predicted fatigue crack propagation life and test results for cruciform fillet-welded joints

Fig.11 Effect of fracture toughness on fatigue crack propagation life of cruciform fillet-welded joints

Fig.12 Effect of temperature-depended Paris parameters on fatigue life of cruciform fillet-welded joints


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