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| An equivalent calculation method of ground shock effects of hypervelocity#br#
projectile striking on rock |
| WANG Mingyang1，2，YUE Songlin1，3，LI Haibo4，QIU Yanyu1，2，LI Jie1 |
(1. State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact，Army Engineering University of PLA，Nanjing，Jiangsu 210007，China；2. School of Mechanical Engineering，Nanjing University of Science and Technology，
Nanjing，Jiangsu 210094，China；3. Baicheng Ordnance Test Center，Baicheng，Jilin 137001，China；
4. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil
Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China) |
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Abstract The purpose of this paper is to investigate the equivalent ground shock effects of hypervelocity impact and shallow buried explosion in rock. Based on the similarity of craters resulted from hypervelocity impacts and shallow buried explosions，the crater can be regarded as the source of ground shock effects，and the equivalent relationship between hypervelocity impact and shallow buried explosion can be established assuming that ground shock energies of them are equal. The relationship between the equivalent charge and the dimensionless impact velocity was obtained，and a simplified expression of the energy conversion coefficient was given. Experimental results of hypervelocity impact on granite indicates that the ground shock waves of equivalent charge explosion and hypervelocity impact are highly similar，which verifies the validity of the equivalent method in the case of a large enough dimensionless impact velocity. When the dimensionless impact velocity increases，both the equivalent charge and the energy conversion coefficient increase. Based on the equivalent method，the relationship curves between the safe thickness of protective layer and the mass of projectile were obtained with the impact velocity of 5 Mach，10 Mach and 15 Mach respectively.
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2018, Vol. 37 
