Q690D 钢对接焊缝疲劳裂纹生长性能的实验研究

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research Pub Date : 2024-11-14 DOI:10.1016/j.jcsr.2024.109151

Xiaodi Guan , Hongchao Guo , Yang Chen , Dixiong Yang , Yue Zhao

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引用次数: 0

摘要

在反复的车辆荷载作用下，焊接接头的疲劳破坏正逐渐成为影响钢结构桥梁使用安全的关键问题之一。本文以 Q690D 高强度钢（HSS）对接焊缝（BW）为研究对象，进行了三种应力比下两种板厚紧凑拉伸（CT）试样的疲劳裂纹生长率（FCGR）试验。得出了不同应力比下的 FCGR 和疲劳裂纹增长阈值（FCGT）。建立了能综合应力比影响的 FCGR 和 FCGT 表达式。此外，还给出了一种确定 Q690D 高速钢 BW 裂纹闭合参数的新方法。在 McEvily 模型的基础上，得出了 Q690D 高速钢生坯 FCG 的计算公式。结果表明，该批 Q690D 高速钢生坯具有良好的 FCG 性能。而且板厚越大，垂直于轧制方向的试样 FCG 性能越好。BS7910 规范推荐的 FCGR 是本研究中 Q690 高速钢白车身的 1.71-2.92 倍。FCGR 随应力比的增加而增加。当应力比从 0.1 增加到 0.2 时，FCGR 增加了 49.48%，而当应力比从 0.2 增加到 0.5 时，FCGR 增加了 129.65%。对于厚度较小的板材，应力比对 FCGR 参数的影响更大。而 FCGT 随应力比的增加呈线性下降。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Experimental investigation on fatigue crack growth performance of Q690D steel butt weld

Fatigue damage of welded joints is gradually becoming one of the key problems affecting the service safety of steel bridges under repeated vehicle loads. The fatigue crack growth rate (FCGR) tests of compact tensile (CT) specimens of two plate thicknesses under three stress ratios were carried out with Q690D high strength steel (HSS) butt weld (BW) in this paper. The FCGR and fatigue crack growth threshold (FCGT) under different stress ratios were obtained. Expressions for the FCGR and FCGT that can synthesize the effects of stress ratio were established. A new method to determine the crack closure parameters of Q690D HSS BW was also given. On the basis of McEvily model, the calculation formula of FCG for Q690D HSS BW was derived. The results show that the Q690D HSS BW of this batch have good FCG performance. And the greater the plate thickness, the better the FCG performance of the specimens taken perpendicular to the rolling direction. The FCGR recommended by BS7910 specification is 1.71–2.92 times that of the Q690 HSS BW in this study. The FCGR increases with the increase of stress ratio. When the stress ratio increases from 0.1 to 0.2, the FCGR increases by 49.48 %, whereas FCGR increases by 129.65 % when the stress ratio increases from 0.2 to 0.5. The stress ratio has a greater influence on the FCGR parameters for plates of smaller thickness. And the FCGT decreases linearly with the increase of stress ratio.

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来源期刊

Journal of Constructional Steel Research 工程技术-工程：土木

CiteScore

7.90

自引率

19.50%

发文量

550

审稿时长

46 days

期刊介绍： The Journal of Constructional Steel Research provides an international forum for the presentation and discussion of the latest developments in structural steel research and their applications. It is aimed not only at researchers but also at those likely to be most affected by research results, i.e. designers and fabricators. Original papers of a high standard dealing with all aspects of steel research including theoretical and experimental research on elements, assemblages, connection and material properties are considered for publication.