Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (1): 191-198.doi: 10.16285/j.rsm.2017.1235

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

One-dimensional impact responses and energy absorption of calcareous sand

WEI Jiu-qi1, 2, 3, LÜ Ya-ru4, 5, LIU Guo-quan2, 3, ZHANG Lei2, 3, LI Lei 2, 3   

  1. 1. State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing, Jiangsu 210007, China; 2. National Defense Engineering Institute, Academy of Military Science of PLA, Luoyang, Henan 471023, China; 3. Henan Key Laboratory of Special Protective Materials, Luoyang, Henan 471023, China; 4. College of Mechanics and Materials, Hohai University, Nanjing, Jiangsu 210098, China; 5. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Hong Kong, China
  • Received:2017-06-16 Online:2019-01-11 Published:2019-01-30
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51779264), the Natural Science Foundation of Jiangsu Province (BK20171399), the Hong Kong Scholars Program (2016QNRC001) and the Young Elite Scientist Sponsorship (17-JCJQ-QT-021) and Henan Science and Technology Innovation Talent Program (154200510028).

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Abstract: Calcareous sand, as a porous medium deposited in marine environment, is an ideal material used for a protective cushion. A total of 83 SHPB tests were conducted on calcareous sand sampled from South China Sea and silica sands bought from Fujian Province with identical grain size distributions and relative densities. The curves of stress wave transmittance, shock response and energy absorption efficiency were obtained. The effects of strain rate, relative densities and moisture content on the impact characteristics of two kinds of sand were analyzed. It is found that the stiffness of calcareous sand is only 10% that of silica sand under the same load and boundary conditions. Because of the existence of inner pore, the attenuation of shock wave in calcareous sand is greater than that in quartz sand. Within the bearing capacity, reducing relative density and increasing water content can effectively improve energy dissipation effect of protective cushion of calcareous sand.

Key words: calcareous sand, test of split Hopkinson pressure bar, stress wave, impact response, energy absorption

CLC Number: 

  • TU 411
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