Kazutaka Kitagawa
Aichi Institute of Technology
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Featured researches published by Kazutaka Kitagawa.
Shock Waves | 1995
M. Yasuhara; Kazutaka Kitagawa; S. Sakashita; Y. Tsuzaki; S. Watanabe
One-dimensional interaction between a planar shock wave and a rubber or low-porosity foam is investigated experimentally and numerically. The considered polyurethane foam is of high density (ρc=290 kg/m3) and lowporosity (ϕ=0.76), and this corresponds to an intermediate condition between rubber and high-porosity foam. Stress-strain relations for the low-porosity foam are investigated by machine tests, which show larger deformation against compressive force and higher non-linearity in stress-strain curve as compared with rubber. Also the low-porosity foam shows a hysteresis cycle. Experiments on shock wave-foam interactions are conducted by using a shock tube. Experimental time history of the surface stress of the foam at the end of the shock tube does not show shock type stress increase, but continuous excessive stress rise can be seen, and then dumping vibration approaching to gas dynamic pressure of the reflected shock wave is followed, and the highest stress amounts about 3∼4 times of the pressure after the reflected gas dynamic shock wave. Interactive motions of gas and the low-porosity foam are analyzed using the Lagrangean coordinates system. An elastic model for a low-porosity foam is assumed to be a single elastic material with the measured stress-strain relation. Results of numerical simulations are compared with the shock tube experiments, which show essentially same stress variations with experimental results.
Archive | 2009
Kazutaka Kitagawa; S. Yamashita; Kazuyoshi Takayama; M. Yasuhara
The propagation and attenuation of blast waves through porous layers is one of the important research topics related to safety assessment and prevention from explosion hazards. This study is a part of series of research on shock in complex media. Blast waves passing through porous layer such as polyurethane foam with high-porosities(≈ 98%) and low densities(≈ 28kg/m3) ; and sand layer having low-porosities(≈ 45%) and high densities (≈1500kg/m3) are tested. Peak overpressures in polyurethane foam and sand layer decrease quickly than that in air, as the blast wave is degenerated into compression waves due to its interaction with three-dimensional porosity distribution. Pressure attenuation caused in present complex media are in between 10 to 40% of the peak overpressure value in air.
Shock Waves | 2001
Kazutaka Kitagawa; T. Jyonouchi; M. Yasuhara
Abstract. Experimental and numerical investigations of gas flows through porous materials have been carried out. We have investigated steady and unsteady processes occurring when the gas flow interacts with porous materials. Densities
Journal of Thermophysics and Heat Transfer | 2017
Takeharu Sakai; Hirofumi Nakazawa; Yuuki Dantsuka; Yuichi Ishida; Kazutaka Kitagawa; Kenichi Hirai
\rho_c
47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition | 2009
Yusuke Kobayashi; Takeharu Sakai; Toshiyuki Suzuki; Kazuhisa Fujita; Keiichi Okuyama; Sumio Kato; Kazutaka Kitagawa
and porosities
Journal of Visualization | 2009
Kazutaka Kitagawa; Mitsutoshi Sakakibara; M. Yasuhara
\phi_g
53rd AIAA Aerospace Sciences Meeting | 2015
Takeharu Sakai; Hirofumi Nakazawa; Yuuki Dantsuka; Kazuya Watanabe; Kazutaka Kitagawa; Kenichi Hirai; Yuichi Ishida
of the four open-cell-type polyurethane foams which were investigated are
39th AIAA Fluid Dynamics Conference | 2009
Kenichi Endo; Kazutaka Kitagawa; Michiru Yasuhara
\rho_c \cong 26 \sim 56
15th AIAA International Space Planes and Hypersonic Systems and Technologies Conference | 2008
Kazutaka Kitagawa; Hayato Goto; Yusuke Kobayashi; Takeharu Sakai
kg/m
Archive | 2017
Takeharu Sakai; Hirofumi Nakazawa; Yuuki Dantsuka; Kazutaka Kitagawa; Kenichi Hirai; Yuichi Ishida
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