Experimental observation for dynamic characteristics of “Shimajiri Mahji” and its evaluation using computational simulation


  • Y Higa
  • H Iyama
  • K Shimojima
  • O Higa
  • S Itoh




We perform herein a direct observation of shockwave propagation using a high-speed camera and estimate properties, such as acoustic velocity and Hugoniot parameter, using the impedance matching scheme to reveal the dynamic characteristics of Okinawa’s unique soil “Shimajiri Mahji.” A computational simulation corresponding to the experimental setup is then conducted. A comparison of the numerical and experimental results demonstrates their fairly good agreement, which suggests that the experimentally estimated dynamic characteristics of “Shimajiri Mahji” are valid. In addition, a computational simulation based on the smoothed particle hydrodynamics is also modeled and performed to elucidate the fragment behavior when the unexploded bomb explosive is at the soil surface. From a series of computational results, we have confirmed and clarified that the fragment behavior is significantly dependent on the amount of explosive charge and soil characteristics.


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How to Cite

Higa, Y., Iyama, H., Shimojima, K., Higa, O. and Itoh, S. (2019) “Experimental observation for dynamic characteristics of ‘Shimajiri Mahji’ and its evaluation using computational simulation”, The International Journal of Multiphysics, 13(3), pp. 241-252. doi: 10.21152/1750-9548.13.3.241.




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