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浙江大学学报(工学版)
浙江大学学报(工学版)  2020, Vol. 54 Issue (10): 2018-2026    DOI: 10.3785/j.issn.1008-973X.2020.10.020
交通工程、土木工程     
低温环境下十字形非传力角焊缝接头的疲劳性能
廖小伟1,2(),王元清2,*(),吴剑国1,石永久2
1. 浙江工业大学 建筑工程学院，浙江 杭州 310023
2. 清华大学 土木工程安全与耐久教育部重点实验室，北京 100084
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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摘要：

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    
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
收稿日期: 2019-10-14 出版日期: 2020-10-28
CLC:  U 441  
基金资助: 国家自然科学基金资助项目（51908501，51678339）
通讯作者: 王元清     E-mail: liaoxiaowei@zjut.edu.cn;wang-yq@mail.tsinghua.edu.cn
作者简介: 廖小伟（1985—），男，博士，从事钢结构的断裂与疲劳研究. orcid.org/0000-0001-8759-1867. E-mail： liaoxiaowei@zjut.edu.cn
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引用本文:

廖小伟,王元清,吴剑国,石永久. 低温环境下十字形非传力角焊缝接头的疲劳性能[J]. 浙江大学学报(工学版), 2020, 54(10): 2018-2026.

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.

链接本文:

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

图 1  十字形非传力角焊缝接头疲劳细节
图 2  十字形非传力接头角焊缝尺寸均值和标准差
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
表 1  十字形非传力角焊缝接头的疲劳试验结果
图 3  低温疲劳试验装置
图 4  试验后的室温和低温有效疲劳试件
图 5  室温和低温疲劳试件断口裂纹扩展形态
图 6  室温和 −60 °C下的疲劳 S-N曲线试验数据
图 7  十字形非传力角焊缝接头的三维裂纹扩展有限元模型
图 8  应力强度因子数值解与解析解的对比
图 9  不同裂纹类型的应力强度因子计算
图 10  十字接头的预测疲劳寿命与试验结果对比
图 11  断裂韧性对十字接头疲劳裂纹扩展寿命的影响
图 12  Paris参数对十字接头疲劳裂纹扩展寿命的影响
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