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Effect of loading rates on crack propagating speed, fracture toughness and energy release rate using single-cleavage trapezoidal open specimen under impact loads

冲击载荷下加载率对裂纹扩展速度、断裂韧度和能量释放率的影响

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Abstract

The former studies indicate that loading rates significantly affect dynamic behavior of brittle materials, for instance, the dynamic compressive and tensile strength increase with loading rates. However, there still are many unknown or partially unknown aspects. For example, whether loading rates have effect on crack dynamic propagating behavior (propagation toughness, velocity and arrest, etc). To further explore the effect of loading rates on crack dynamic responses, a large-size single-cleavage trapezoidal open (SCTO) specimen was proposed, and impacting tests using the SCTO specimen under drop plate impact were conducted. Crack propagation gauges (CPGs) were employed in measuring impact loads, crack propagation time and velocities. In order to verify the testing result, the corresponding numerical model was established using explicit dynamic software AUTODYN, and the simulation result is basically consistent with the experimental results. The ABAQUS software was used to calculate the dynamic SIFs. The universal function was calculated by fractal method. The experimental-numerical method was employed in determining initiation toughness and propagation toughness. The results indicate that crack propagating velocities, dynamic fracture toughness and energy release rates increase with loading rates; crack delayed initiation time decreases with loading rates.

摘要

通常,加载率会显著影响脆性材料的抗压强度和拉伸强度等力学行为,但是对其它动态力学性 能的影响仍然存在许多未知或部分未知的情况,比如,加载率是否会影响裂纹的动态扩展行为(扩展 韧度,裂纹速度和裂纹止裂等)。为了进一步探讨加载率对裂纹动态响应的影响,提出梯形开口的侧 开单裂纹构型试样,并在落锤冲击装置下对该试样进行了冲击试验。利用裂纹扩展计测量冲击载荷、 裂纹扩展时间和裂纹速度。为了验证测试结果,采用显式动力软件AUTODYN 建立了相应的数值模 型,数值仿真结果与实验结果基本一致。利用有限元程序ABAQUS 计算动态应力强度因子,并采用 普适函数进行修正,最后基于实验-数值方法确定裂纹起始韧度和裂纹扩展韧度。结果表明,裂纹扩 展速度、动态断裂韧度和能量释放率均随着加载率的增加而增加,裂纹的延迟起裂时间随着加载率的 增加而缩短。

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Authors and Affiliations

  1. State Key Laboratory of Hydraulics and Mountain River Engineering, School of Architecture and Environment, Sichuan University, Chengdu, 610065, China

    Lin Lang  (郎林), Han-bing Wang  (王寒冰) & Jian-wei Huang  (黄建伟)

  2. Key Laboratory of Deep Underground Science and Engineering of Ministry of Education, School of Architecture and Environment, Sichuan University, Chengdu, 610065, China

    Zhe-ming Zhu  (朱哲明), Meng Wang  (王蒙) & Xian-shang Zhang  (张宪尚)

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  1. Lin Lang  (郎林)
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Correspondence to Zhe-ming Zhu  (朱哲明).

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Foundation item: Projects(11672194, U19A2098) supported by the National Natural Science Foundation of China; Project(2018SCU12047) supported by Fundamental Research Funds for the Central Universities, China; Project(2018JZ0036) supported by the Project of Science and Technology of Sichuan Province, China

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Lang, L., Zhu, Zm., Wang, Hb. et al. Effect of loading rates on crack propagating speed, fracture toughness and energy release rate using single-cleavage trapezoidal open specimen under impact loads. J. Cent. South Univ. 27, 2440–2454 (2020). https://doi.org/10.1007/s11771-020-4460-5

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