Experimental study on the Mode l fracture toughness of frozen silty clay incorporating Digital image correlation

IF 4.7 2区 工程技术 Q1 MECHANICS Engineering Fracture Mechanics Pub Date : 2024-10-28 DOI:10.1016/j.engfracmech.2024.110597
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Abstract

To investigate the effects of initial moisture content and temperature on the Mode I fracture toughness (KIc) of frozen silty clay, a series of three-point bending tests were conducted. Rectangular specimens with prefabricated cracks were tested, and digital image correlation (DIC) technology was employed to analyze the microscopic characteristics at the crack tip. The results indicate that the Mode I fracture toughness of frozen silty clay increases with decreasing temperature and increasing initial moisture content. Temperature governs the failure mode, with plastic failure predominantly occurring at high temperatures and brittle failure at low temperatures. Based on the load–displacement curves and DIC recordings, the macroscopic fracture process of the specimens can be categorized into three stages: elastic deformation, formation of the failure surface, and specimen failure. Additionally, the crack propagation process can be further divided into three stages: initiation and development of microcracks, transition from microcracks to macroscopic cracks, and rapid development of macroscopic cracks. These findings provide critical insights for slope stability research in cold regions and offer new perspectives for engineering design and construction in similar environments.
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结合数字图像相关性对冻结淤泥质粘土的模式 l 断裂韧性进行实验研究
为了研究初始含水量和温度对冻结淤泥质粘土的模式 I 断裂韧性(KIc)的影响,进行了一系列三点弯曲试验。试验采用了预制裂缝的矩形试样,并利用数字图像相关(DIC)技术分析了裂缝尖端的微观特征。结果表明,冷冻淤泥质粘土的模式 I 断裂韧性随着温度的降低和初始含水量的增加而增加。破坏模式受温度影响,塑性破坏主要发生在高温下,而脆性破坏则发生在低温下。根据荷载-位移曲线和 DIC 记录,试样的宏观断裂过程可分为三个阶段:弹性变形、形成破坏面和试样破坏。此外,裂纹扩展过程还可进一步分为三个阶段:微裂纹的产生和发展、微裂纹向宏观裂纹的过渡以及宏观裂纹的快速发展。这些发现为寒冷地区的边坡稳定性研究提供了重要启示,并为类似环境下的工程设计和施工提供了新的视角。
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来源期刊
CiteScore
8.70
自引率
13.00%
发文量
606
审稿时长
74 days
期刊介绍: EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.
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