Crack arrest characteristics and dynamic fracture parameters of moving cracks encountering double holes under impact loads

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering Pub Date : 2024-10-26 DOI:10.1016/j.ijimpeng.2024.105158

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引用次数: 0

Abstract

Brittle materials such as rock or concrete contain a large number of micro-cracks, voids, and other defects. Under external impacting loads, the interaction between fissures and holes affects the bearing capacity and stability of Engineering structures. To study the interaction mechanism between moving cracks and circular holes, a large-size semi-circular notched with a fissure and double circular hole (SNFDH) specimen was suggested in this research, and the dynamic fracture tests were carried out on the SNFDH specimens with different double circular hole spacing (35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, and 70 mm) using a drop hammer impact test device. Crack propagation gauges were employed to track the time and velocity at which the crack propagated along its trajectory. Dynamic Drucker-Prager yield criterion and cumulative damage failure criterion were used in the numerical simulation of the SNFDH concrete materials. The program AUTODYN was employed to simulate the crack growth characteristics when a crack encounters the double hole. The program ABAQUS was applied to calculate the dynamic fracture parameters of cracks. The test results manifest that the crack propagating trajectory has three different characteristics according to the double hole spacing; the double circular hole has an arresting function for a moving crack; the size of the double hole spacing has a significant effect on the crack propagating velocity, crack propagating length, dynamic stress intensity factor and dynamic energy release rate; the configuration of the SNFDH specimen can be used to investigate the crack arrest mechanism when moving crack encountering double holes.

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冲击载荷下遇到双孔的移动裂纹的裂纹捕捉特征和动态断裂参数

岩石或混凝土等脆性材料含有大量微裂缝、空隙和其他缺陷。在外部冲击荷载作用下，裂缝和孔洞之间的相互作用会影响工程结构的承载能力和稳定性。为了研究移动裂缝与圆孔之间的相互作用机理，本研究提出了带裂缝和双圆孔（SNFDH）的大尺寸半圆形缺口试件，并使用落锤冲击试验装置对不同双圆孔间距（35 毫米、40 毫米、45 毫米、50 毫米、55 毫米、60 毫米和 70 毫米）的 SNFDH 试件进行了动态断裂试验。裂纹扩展仪用于跟踪裂纹沿其轨迹扩展的时间和速度。在对 SNFDH 混凝土材料进行数值模拟时，采用了动态德鲁克-普拉格屈服准则和累积损伤失效准则。采用 AUTODYN 程序模拟裂缝遇到双孔时的生长特征。采用 ABAQUS 程序计算裂缝的动态断裂参数。试验结果表明，双孔间距不同，裂纹扩展轨迹具有三种不同特征；双圆孔对移动裂纹具有捕捉作用；双孔间距的大小对裂纹扩展速度、裂纹扩展长度、动态应力强度因子和动态能量释放率均有显著影响；SNFDH 试件的配置可用于研究移动裂纹遇到双孔时的裂纹捕捉机制。

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

International Journal of Impact Engineering 工程技术-工程：机械

CiteScore

8.70

自引率

13.70%

发文量

241

审稿时长

52 days

期刊介绍： The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications