In this paper, a large size trapezoidal open crack with arc‐bottom (TOCAB) configuration specimen was proposed. Experiments were carried out using 0°, 60°, 90° and 120° TOCAB specimens under drop weight impacts with loading rate from 150 to 350 GPa/s. The crack length and crack speed were calculated by using fractal method. It shows that the crack speed corrected by fractal method is more than 12% the original speed calculated using the straight length. The AUTODYN code was employed to simulate crack propagation path and crack speed. The dynamic stress intensity factors (DSIFs) were calculated using ABAQUS code. The experimental and numerical results show that all the three TOCAB specimens have arresting function on running cracks; crack propagation velocity increases with loading rates; the critical DSIFs at initiation are higher than those at propagation. The study presents how to arrest a running crack and how to protect significant structures from being completely damaged.

中文翻译：

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冲击作用下圆弧形试样的止裂机理和动力学行为研究

在本文中，提出了一种带有弧底（TOCAB）构型的大尺寸梯形开放裂纹。实验是使用0°，60°，90°和120°TOCAB样品在落重影响下以150至350 GPa / s的加载速率进行的。裂纹长度和裂纹速度采用分形法计算。结果表明，用分形方法校正后的裂纹速度是使用直线长度计算的原始速度的12％以上。使用AUTODYN代码来模拟裂纹扩展路径和裂纹速度。动态应力强度因子（DSIF）使用ABAQUS代码计算。实验和数值结果表明，三个TOCAB试样均具有对运行裂纹的阻止作用。裂纹扩展速度随加载速率的增加而增加；起始时的临界DSIF高于传播时的临界DSIF。这项研究提出了如何阻止正在运行的裂缝以及如何保护重要结构免受完全破坏。