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Nishida, Akemi; Ota, Yoshimi*; Tsubota, Haruji; Li, Y.
Transactions of the 24th International Conference on Structural Mechanics in Reactor Technology (SMiRT-24) (USB Flash Drive), 10 Pages, 2017/08
Many empirical formulas have been proposed for evaluating local damage to reinforced concrete structures caused by impacts of rigid missiles. Most of these formulas have been derived based on tests involving impact perpendicular to target structures. Thus far, few tests with oblique impact onto target structures have been carried out. In this study, we aim to propose a new formula for evaluating the local damage caused by oblique impact based on previous experimental and simulation results. We performed simulation analyses for evaluating the local damage to reinforced concrete panels subjected to oblique impacts by soft missiles under various impact velocities by using a simulation method that was validated using the results of previous impact experiments. Based on the results of these simulation analyses, quantitative evaluation of the reduction in local damage and the differences in energy transfer process due to the difference in impact angle and impact velocity are investigated.
Nishida, Akemi; Ota, Yoshimi*; Tsubota, Haruji; Li, Y.
Proceedings of 2017 ASME Pressure Vessels and Piping Conference (PVP 2017) (CD-ROM), 10 Pages, 2017/07
Many empirical formulas have been proposed for evaluating local damage to reinforced concrete (RC) structures caused by impacts of rigid projectiles. Most of these formulas have been derived based on impact tests perpendicular to the target structures. Up to now, few impact tests oblique to the target structures have been carried out. This study has been conducted with the purpose of proposing a new formula for evaluating the local damage caused by oblique impacts based on previous experimental and simulation results. In this paper, the results of simulation analyses for evaluating the local damage to a RC panel subjected to normal and oblique impacts by deformable projectile, by using the simulation method that the validity was confirmed through simulation analysis of past impact experimental results. Based on the results of these simulation analyses, the quantitative evaluation of reduction effects in the local damage caused by the difference of the impact angle is investigated.
Ota, Yoshimi*; Nishida, Akemi; Tsubota, Haruji; Li, Y.
Proceedings of 25th International Conference on Nuclear Engineering (ICONE-25) (CD-ROM), 6 Pages, 2017/07
Many empirical formulae have been proposed to evaluate the local damage to reinforced concrete structures caused by the impact of rigid projectiles. Most of these formulae have been derived based on impact tests perpendicular to the target structures. To date, few impact tests oblique to the target structures have been conducted. The purpose of this study is to propose a new formula for evaluating the local damage caused by oblique impacts based on experiments and simulations. The new formula is derived by modifying an empirical formulation for normal impact and the agreement with results of past oblique impact tests is discussed.
Nishida, Akemi; Ota, Yoshimi*; Tsubota, Haruji; Li, Y.
Proceedings of 25th International Conference on Nuclear Engineering (ICONE-25) (CD-ROM), 8 Pages, 2017/07
Many empirical formulae have been proposed for evaluating the local damage to reinforced concrete structures caused by rigid projectile impact. Most of these formulae are based on impact tests perpendicular to the target structures. To date, few impact tests oblique to the target structures have been conducted. In this study, we aim to obtain a new formula for evaluating the local damage caused by oblique impacts based on previous experimental and simulation results. We analyze and simulate the local damage owing to impact by deformable projectiles. The experimental and simulation results were in good agreement and confirmed the validity of the proposed analytical method. Furthermore, the internal energy of the deformable projectile absorbed upon impact was approximately 60% of the total energy. In comparison to a rigid projectile, it is possible to reduce the impact load and consequently the damage to the target.
Tsubota, Haruji; Ota, Yoshimi*; Nishida, Akemi; Li, Y.
Proceedings of 25th International Conference on Nuclear Engineering (ICONE-25) (CD-ROM), 7 Pages, 2017/07
Many empirical formulae have been proposed for evaluating the local damage to reinforced concrete structures caused by rigid projectile impact. Most of these formulae have been derived based on impact tests perpendicular to target structures. To date, few impact tests oblique to target structures have been carried out. Therefore, in this study, we propose a new formula for evaluating the local damage caused by oblique impact based on past experimental results and the results of simulation analyses. In this paper, we present the results of simulation analyses for evaluating the local damage to reinforced concrete panels caused by normal and oblique impact of deformable projectiles, focusing especially on perforation phenomena. Based on the analytical results, we investigate the differences in impact response characteristics between normal and oblique impact.
Ota, Yoshimi*; Nishida, Akemi; Tsubota, Haruji
Kozo Kogaku Rombunshu, A (CD-ROM), 63A, p.1132 - 1140, 2017/03
Many empirical formulas have been proposed for evaluating the local damage to reinforced concrete structures caused by rigid missile impact. Most of these formulas have been derived based on impact tests perpendicular to target structures and up to now few impact tests oblique to target structures has been carried out. Therefore, the purpose of this study is to propose a new formula for evaluating the local damage caused by oblique impact based on past experimental results and simulation results. In this paper, a new formula is derived by modifying a past empirical formula of normal impact and the conformity of the formula to the results of past oblique impact tests is discussed.
Nakagawa, Kazumichi*; Kaneko, Fusae*; Ota, Yoshimi*; Tanaka, Masahito*; Kitada, Tomo*; Agui, Akane; Fujii, Kentaro; Yokoya, Akinari; Watanabe, Kazutoshi*; Yamada, Toru*
Journal of Electron Spectroscopy and Related Phenomena, 144-147, p.271 - 273, 2005/06
Times Cited Count：12 Percentile：50.37(Spectroscopy)no abstracts in English
Tagawa, Masahito*; Asada, Hidetoshi*; Matsuura, Yoshimitsu*; Yokota, Kumiko*; Teraoka, Yuden; Kitamura, Akira*; Fontaine, J.*; Belin, M.*
no journal, ,
New room-temperature deposition technology of a hydrogenated diamond-like carbon (DLC) film was developed with hyperthermal hydrocarbon beams. Four CH
molecular beams with different beam energy and ion composition were prepared and deposited DLC films were evaluated by various surface analytical methods including Raman spectroscopy, RBS and SR-PES. It was found that hydrogenated (20-30%) DLC films can be deposited with use of CH as a source gas. It was also shown that the DLC film deposited with a CH beam including relatively high ion component exhibit better tribological properties.
Kimura, Atsushi; Taguchi, Mitsumasa; Otani, Yoshimi*; Hiratsuka, Hiroshi*; Kojima, Takuji; Hirota, Koichi
no journal, ,
no abstracts in English
Kimura, Atsushi; Taguchi, Mitsumasa; Otani, Yoshimi*; Hirota, Koichi
no journal, ,
no abstracts in English
-ray irradiated aqueous chlorophenol solutionsTaguchi, Mitsumasa; Kimura, Atsushi; Otani, Yoshimi*; Shiraishi, Fujio*; Hirota, Koichi
no journal, ,
no abstracts in English
-ray irradiated aqueous chlorophenol solutionsTaguchi, Mitsumasa; Kimura, Atsushi; Hirota, Koichi; Otani, Yoshimi*; Shiraishi, Fujio*
no journal, ,
no abstracts in English
Ota, Yoshimi*; Nishida, Akemi; Tsubota, Haruji
no journal, ,
Many empirical formulas have been proposed for evaluating the local damage to reinforced concrete structures caused by rigid missile impact. Most of these formulas have been derived based on impact tests perpendicular to target structures and up to now few impact tests oblique to target structures has been carried out. Therefore, the purpose of this study is to propose a new formula for evaluating the local damage caused by oblique impact based on past experimental results. A new formula is derived by modifying a past empirical formula of normal impact and the conformity of the formula to the results of past oblique impact tests is discussed.
Ota, Yoshimi*; Nishida, Akemi; Tsubota, Haruji
no journal, ,
no abstracts in English
Nishida, Akemi; Ota, Yoshimi*; Tsubota, Haruji
no journal, ,
no abstracts in English
Tsubota, Haruji; Nishida, Akemi; Ota, Yoshimi*
no journal, ,
no abstracts in English
Nishida, Akemi; Ota, Yoshimi*; Tsubota, Haruji
no journal, ,
no abstracts in English
Ota, Yoshimi*; Nishida, Akemi; Tsubota, Haruji
no journal, ,
no abstracts in English
Tsubota, Haruji; Ota, Yoshimi*; Nishida, Akemi
no journal, ,
no abstracts in English
Ota, Yoshimi*; Nishida, Akemi; Tsubota, Haruji
no journal, ,
Many empirical formulas have been proposed for evaluating the local damage to reinforced concrete structures caused by rigid missile impact. Most of these formulas have been derived based on impact tests perpendicular to target structures and up to now few impact tests oblique to target structures has been carried out. Therefore, the purpose of this study is to propose a new formula for evaluating the local damage caused by oblique impact based on past experimental results and simulation results. In this presentation, a new formula is derived by modifying a past empirical formula of normal impact and the conformity of the formula to the results of past oblique impact tests is discussed.
