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Acta Mechanica Solida Sinica

, Volume 32, Issue 1, pp 93–104 | Cite as

The Effect of Loading Rates on Crack Dynamic Behavior Under Medium–Low Speed Impacts

  • Peng Ying
  • Zheming ZhuEmail author
  • Lei Zhou
  • Meng WangEmail author
  • Yuqing Dong
  • Hao Qiu
Article
  • 96 Downloads

Abstract

Rock structures are often subjected to dynamic loads, such as blasts, impacts and earthquakes, and their loading rates differ largely. To investigate the effect of loading rates on the dynamic behavior of crack propagation, impact tests were conducted on large single-cleavage semicircle compression (LSCSC) specimens using a drop weight impact test system. Five types of rock materials were selected to prepare the LSCSC specimens, and crack propagation gauges were mounted along the crack propagation paths to measure crack initiation time and propagation speeds. Finite element models were established by using ABAQUS code, and the dynamic stress intensity factors (SIFs) were calculated. The curves of dynamic SIFs versus time were obtained, and the initiation toughness was determined by using these curves and the initiation time measured in the impact tests. The results show that loading rate has a significant effect on crack propagation behavior, and both the crack propagation speed and initiation toughness increase with the loading rate, whereas the delayed fracture time decreases with the increase in loading rate.

Keywords

Loading rate Initiation toughness Delayed fracture time Crack propagation speed Impact 

Notes

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (11672194; 11702181), by Sichuan Administration of Work Safety (aj20170515161307), and the project of Science and Technology of Sichuan province (2018JZ0036).

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics 2018

Authors and Affiliations

  1. 1.MOE Key Laboratory of Deep Underground Science and Engineering, School of Architecture and EnvironmentSichuan UniversityChengduChina

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