Tomoharu Matsumura

Research Field

We performed miniature flyer impact experiments to investigate the relationship between the apparent (ua) and actual (uA) particle velocities measured by a velocity interferometer in single-crystal lithium fluoride (LiF) that was shock-compressed along the [100] axis. The miniature flyer was accelerated to velocities in the range 652.5–1937.6 m/s by a tabletop pulsed laser. An empirical relationship of ua = (1.2749 ± 0.0102)uA was obtained. The obtained relationship agreed well with the results of a previous study within the experimental errors and its uncertainty was less than ±1%. This result indicates that the present experimental technique is effective for measuring the relationship between ua and uA of shocked transparent materials with a comparable accuracy to conventional methods.

Lithium fluoride

10.1063/1.3553293

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Citations (1)

DDT test for smokeless powders

Journal of the Japan Explosives Society : explosion, explosives and pyrotechnics (2002)

Ken Okada Tomoharu Matsumura Yoshio Nakayama Masamichi Ishiguchi Hisashi Iguchi

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Propagation and attenuation characteristics of blast wave pressure generated from an explosion inside an earth-covered magazine

Science and Technology of Energetic Materials : journal of the Japan Explosive Society (2013)

Dongjoon Kim Tomoharu Matsumura Yoshio Nakayama

Blast wave

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Citations (6)

Background-Oriented Schlieren for Large-Scale and High-Speed Aerodynamic Phenomena (Invited)

53rd AIAA Aerospace Sciences Meeting (2015)

Toshiharu Mizukaki Brett F. Bathel Stephen Borg Paul M. Danehy Scott M. Murman

Visualization of the flow field around a generic re-entry capsule in subsonic flow and shock wave visualization with cylindrical explosives have been conducted to demonstrate sensitivity and applicability of background-oriented schlieren (BOS) for field experiments. The wind tunnel experiment suggests that BOS with a fine-pixel imaging device has a density change detection sensitivity on the order of 10(sup -5) in subsonic flow. In a laboratory setup, the structure of the shock waves generated by explosives have been successfully reconstructed by a computed tomography method combined with BOS.

10.2514/6.2015-1692

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Citations (8)

Numerical simulations on blast wave around the small-scale model of subsurface magazine

Yuta Sugiyama T. Tanaka Akiko Matsuo Tomotaka Homae Kunihiko Wakabayashi

Blast wave

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Experimental Study of Fragmentation of Hybrid Rocket Fuel

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES AEROSPACE TECHNOLOGY JAPAN (2014)

Koki Kitagawa Yoshio Nakayama Tomoharu Matsumura Kunihiko Wakabayashi Ryo Toda

For the first step of investigating TNT equivalency, blasting tests without igniting to fuel samples in the air atmosphere were carried out in order to investigate the fragmentation characteristic of the fuel blocks. PP, PMMA and FT-0070 blocks were blasted by No.6 electric detonator or No.6 electric detonator + P-4. As a result, it is revealed that the blocks are fragmented into smaller particles if the original block size is smaller and if the power of the high explosives is higher. However, the effect of power of the high explosives is small in the case of this study. It is revealed that PP is not fragmented so small, FT-0070 is fragmented to powder and the fragmented particles size of PMMA is between PP and FT-0070.

Detonator

Fragmentation

Rocket (weapon)

10.2322/tastj.12.pa_15

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A study of explosion and deformation processes of 155 mm diameter steel shell with confined explosive

Science and Technology of Energetic Materials : journal of the Japan Explosive Society (2003)

Kunihiko Wakabayashi Masahide Katayama Takayuki Abe Eishi Kuroda Ken Okada

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