Effect of Fatigue Loading and Precracking on the Interface Shear Transfer of Cold Joints

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-08-05 DOI:10.1007/s12205-024-1455-z

Jie Liu, Anning Wan, Xuyong Chen, Hehui Zheng, Xiangyu Huang, Qiaoyun Wu

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Abstract

This paper investigated the shear strengths (that is, the ultimate strength, post-ultimate residual strength and failure strength) and shear transfer mechanism of cold joints after experiencing high-cycle fatigue loading and/or precracking. Twelve cold joint push-off specimens with naturally smooth interfaces were cast and tested. Six of these specimens were directly subjected to push-off tests without any prior treatment, serving as control specimens. Two specimens were intentionally precracked, while the remaining four specimens underwent two million constant amplitude load cycles, before the push-off test. Push-off test results indicate that the effect of fatigue loading on shear strengths can be disregarded. Precracking has very little influence upon the residual strength and the failure strength, but it significantly reduces the ultimate strength to a level comparable to the residual strength. Moreover, this paper identified a new interface failure mode and presented complete interface shear load-displacement curves, revealing the shear transfer mechanism at the interface. This mechanism provides a clear explanation for the aforementioned effect on the shear strengths. Besides, building upon this mechanism and through a force-balance analysis, the equations are proposed for predicting the residual strength and failure strength of cold joints, which are found to reliably yield accurate calculation results.

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疲劳加载和预裂对冷接缝界面剪力传递的影响

本文研究了冷接头在经历高循环疲劳加载和/或预开裂后的剪切强度（即极限强度、极限后残余强度和破坏强度）和剪切传递机制。本文铸造并测试了 12 个具有自然光滑界面的冷接缝推移试样。其中六个试样作为对照试样，未经任何预处理就直接进行了推移试验。两个试样被有意预裂，其余四个试样在推移试验前经历了 200 万次恒定振幅载荷循环。推移试验结果表明，疲劳加载对剪切强度的影响可以忽略不计。预裂纹对残余强度和破坏强度的影响很小，但会显著降低极限强度，使其达到与残余强度相当的水平。此外，本文还确定了一种新的界面破坏模式，并给出了完整的界面剪切荷载-位移曲线，揭示了界面的剪切传递机制。这一机制清楚地解释了上述对剪切强度的影响。此外，在这一机制的基础上，通过力平衡分析，提出了预测冷接缝残余强度和破坏强度的方程，发现这些方程能可靠地得出精确的计算结果。

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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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.