Effect of loading rates on crack propagating speed, fracture toughness and energy release rate using single-cleavage tra
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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 LANG Lin(郎林)1, ZHU Zhe-ming(朱哲明)2, WANG Han-bing(王寒冰)1, HUANG Jian-wei(黄建伟)1, WANG Meng(王蒙)2, ZHANG Xian-shang(张宪尚)2 1. State Key Laboratory of Hydraulics and Mountain River Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, China; 2. Key Laboratory of Deep Underground Science and Engineering of Ministry of Education, School of Architecture and Environment, Sichuan University, Chengdu 610065, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 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. Key words: crack velocity; dynamic fracture toughness; particle velocity; loading rate; single-cleavage trapezoidal open (SCTO) specimen Cite this article as: LANG Lin, ZHU Zhe-ming, WANG Han-bing, HUANG Jian-wei, WANG Meng, ZHANG Xian-shang. Effect of loading rates on crack propagating speed, fracture toughness and energy release rate using single cleavage trapezoidal open specimen under impact loads [J]. Journal of Central South University, 2020, 27(8): 2440−2454. DOI: https://doi.org/10.1007/s11771-020-4460-5.
1 Introduction Brittle materials, such as rock or concrete, often contain a large number of cracks or microcracks. Under external loading, these cracks may propagate violently, which will seriously affect Foundation
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the stability and service life of engineering structures. In addition, engineering structures are frequently subjected to dynamic loading, such as earthquakes, impacts and blasts. These three types of dynamic loadings have different loadin
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