著者

臺丸谷 政志 小林 秀敏

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集A編 (ISSN:18848338)

巻号頁・発行日

vol.77, no.776, pp.638-646, 2011 (Released:2011-04-25)

参考文献数

18

被引用文献数

1 1

---

The Japanese sword is a weapon peculiar to Japan. The Japanese sword is interesting not only from the viewpoint of traditional crafts of arts, but also from the aspect of modern science and technology because the way of making and its functionality as a weapon are really consistent with science. The present study is concerned with the connection between tohshin (blade) and tsuka (hilt) of the sword. Only one mekugi-take (retaining peg made of bamboo) with about 5mm in diameter holds Nakago (tang) in the hilt. However the slender mekugi might not be broken, even though in the case of violent sword-fighting. This fact has been historically demonstrated in many battles by Japanese swords. In this study, using a Tachi being the typical Japanese sword, it is examined theoretically and experimentally from the viewpoint of impact engineering why a mekugi used in Japanese swords might not be broken. As a result, it is made clear that such a strong force as breaking mekugi-take does not act on it, because of the location of mekugi-ana (a hole for mekugi) in the tang, which has been made by the traditional code of sword-smiths.

著者

臺丸谷 政志 小林 秀敏

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.60, no.7, pp.668-673, 2011-07-15 (Released:2011-07-20)

参考文献数

12

被引用文献数

1

---

The Japanese sword is interesting not only from the viewpoint of traditional crafts of arts, but also from the aspect of modern science and technology because the way of making and its functionality as a weapon are really consistent with modern science. The present study is concerned with the joint between tohshin (blade) and tsuka (hilt) of the sword. Only one mekugi-take (retaining peg made of bamboo) with about 5mm in diameter holds Nakago (tang) in the hilt. However the slender mekugi might not be broken, even in the case of violent sword-fighting. This fact has been historically demonstrated in many battles by Japanese swords. In this study, using a Japanese sword model, it is examined theoretically and experimentally why a mekugi used in Japanese swords might not be broken from the viewpoint of impact engineering. Consequently, it is presumed that such a strong force as breaking mekugi-take does not act on it, because of the location of mekugi-ana (a hole for mekugi) in the tang, which has been made by following the traditional code of swordsmiths.

著者

沖野 友洋 永田 恵輔 高野 純一 小林 秀敏

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

pp.21-00073, (Released:2021-09-17)

参考文献数

19

---

The crash safety structure of the railway vehicles is important as one of the safety measures against the train crews and the passengers in the event of a collision accident. It is impractical to perform collision testing many times using the actual train unit to design the crash safety structure, whereby the numerical simulation is effective and it is important to validate the analytical accuracy. However, there are few studies of collision tests and numerical simulations using actual size carbody structures according to Japanese design standards, and even fundamental data have not been sufficiently obtained. Therefore, firstly, the authors performed the collision test of an actual-size partial stainless-steel carbody structure of a railway leading vehicle against a rigid wall and finite element analysis under the same condition as the test for the purpose of validating and improving the analytical accuracy of numerical simulation. Secondly, we carried out the collision test of the same carbody structure of a railway leading vehicle against a typical large dump truck in Japan and obtained the fundamental data such as the time histories of the impact compression load and the acceleration of the carbody structure as well as the deformational and fractural behavior of them. We also performed FE analysis under the same condition as the experimental test and compared the numerical result to the experimental one. As a result, the numerical result was consistent with the experimental result. Finally, we expanded the partial carbody structure model to a single carbody model and carried out the collision analysis of it against a large dump truck. Thereby, the impact deformation and fracture behavior of the railway carbody under the actual level-crossing accident were estimated.

著者

臺丸谷 政志 小林 秀敏 PEARSON James Todd PEREZ Jose Luis 斉藤 文護

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.64, no.623, pp.2417-2423, 1998-07-25

被引用文献数

1

---

The present study is concerned with the estimation of power in Karate-doh. The measuring method and numerical estimation for impact forces produced by Karate-doh hand techniques such as Syutoh-uchi, Tettsui-uchi and so on, are discussed by experiments (by means of Tameshi-wari) and numerical simulations. In the beginning, an impact experiment of simply supported concrete beams was conducted to examine the impact response and the impact breaking of the concrete beam. And then Tameshi-wari of simply supported concrete beams was performed. In order to understand the mechanism of impact breaking of concrete beams by Karate-doh hand techniques, a numerical simulation was also carried using a dynamic finite element method with a Newmark-β method. The impact force generated between the hand and the concrete beam was estimated to be beyond 4.5 kN. It was also found that a reaction at both ends of the beam was almost never generated by virtue of the dominant modes of bending deformation of the beam. This indicates that, by means of Tameshi-wari, the impact breaking of the concrete beam floating in air is quite within the bounds of possibility. Therefore Tameshi-wari for concrete beams suspended in air was also tried and achieved the predicted results.

著者

沖野 友洋 永田 恵輔 高野 純一 小林 秀敏

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.87, no.902, pp.21-00073, 2021 (Released:2021-10-25)

参考文献数

19

---

The crash safety structure of the railway vehicles is important as one of the safety measures against the train crews and the passengers in the event of a collision accident. It is impractical to perform collision testing many times using the actual train unit to design the crash safety structure, whereby the numerical simulation is effective and it is important to validate the analytical accuracy. However, there are few studies of collision tests and numerical simulations using actual size carbody structures according to Japanese design standards, and even fundamental data have not been sufficiently obtained. Therefore, firstly, the authors performed the collision test of an actual-size partial stainless-steel carbody structure of a railway leading vehicle against a rigid wall and finite element analysis under the same condition as the test for the purpose of validating and improving the analytical accuracy of numerical simulation. Secondly, we carried out the collision test of the same carbody structure of a railway leading vehicle against a typical large dump truck in Japan and obtained the fundamental data such as the time histories of the impact compression load and the acceleration of the carbody structure as well as the deformational and fractural behavior of them. We also performed FE analysis under the same condition as the experimental test and compared the numerical result to the experimental one. As a result, the numerical result was consistent with the experimental result. Finally, we expanded the partial carbody structure model to a single carbody model and carried out the collision analysis of it against a large dump truck. Thereby, the impact deformation and fracture behavior of the railway carbody under the actual level-crossing accident were estimated.

著者

臺丸谷 政志 小林 秀敏

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 A編 (ISSN:03875008)

巻号頁・発行日

vol.77, no.776, pp.638-646, 2011

被引用文献数

1

---

The Japanese sword is a weapon peculiar to Japan. The Japanese sword is interesting not only from the viewpoint of traditional crafts of arts, but also from the aspect of modern science and technology because the way of making and its functionality as a weapon are really consistent with science. The present study is concerned with the connection between <i>tohshin</i> (blade) and <i>tsuka</i> (hilt) of the sword. Only one <i>mekugi-take</i> (retaining peg made of bamboo) with about 5mm in diameter holds <i>Nakago</i> (tang) in the hilt. However the slender <i>mekugi</i> might not be broken, even though in the case of violent sword-fighting. This fact has been historically demonstrated in many battles by Japanese swords. In this study, using a <i>Tachi</i> being the typical Japanese sword, it is examined theoretically and experimentally from the viewpoint of impact engineering why a <i>mekugi</i> used in Japanese swords might not be broken. As a result, it is made clear that such a strong force as breaking <i>mekugi-take</i> does not act on it, because of the location of <i>mekugi-ana</i> (a hole for <i>mekugi</i>) in the tang, which has been made by the traditional code of sword-smiths.

著者

沖野 友洋 永田 恵輔 堀川 敬太郎 小林 秀敏

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

pp.19-00249, (Released:2019-12-26)

参考文献数

13

被引用文献数

2

---

The crash safety structure of the railway vehicles is effective as one of the safety measures against the train crews and the passengers in the event of a collision accident. The standards for crashworthiness of railway vehicles are defined in Europe and the U.S., while there are no standards for crash safety in Japan. Therefore, it is important to establish the evaluation method for crashworthiness of railway vehicles considering the actual situation of collision accidents in Japan. The authors carried out finite element analyses of a level crossing accident under various conditions (collision speed, mass of the obstacle and relative position between the train and the obstacle) based on the statistical analysis of serious level-crossing accidents in the past in Japan, and calculated the deceleration time histories in the passenger area under each condition. We evaluated these deceleration waveforms according to European and the U.S. standards for crashworthiness, and we also performed finite element analyses of dummy’s behavior and injury values using these deceleration waveforms as input. We verified the correlation between the evaluation results in terms of the deceleration according to these standards and dummy’s injury values obtained by finite element analyses. As a result, the evaluation according to the velocity at which a passenger contacts the seat back ahead of him (the U.S. standards) was the most effective. Moreover, the integrated values of the deceleration of the passenger area during an integration time t360 had the highest correlation with the dummy’s injury values.

著者

沖野 友洋 永田 恵輔 佐藤 裕之 堀川 敬太郎 小林 秀敏

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.85, no.869, pp.18-00270, 2019 (Released:2019-01-25)

参考文献数

11

被引用文献数

2 4

---

The crash safety structure of the railway vehicles is effective as one of the safety measures against the train crews and the passengers in the event of a collision accident. However there is no standard for crash safety in Japan. In order to discuss guidelines for the crash safety design of the vehicle structure, it is important to grasp the actual situation of collision accidents in Japan. Therefore, firstly the authors performed the statistical analysis of serious level-crossing accidents for the past 30 years. Secondly, we carried out finite element analyses of a level crossing accident with a dump-truck under various conditions (collision position, collision angle, collision speed and mass of the load on the dump-truck) based on the result of the statistical analysis. We also evaluated their results in terms of the contact force, the deformation energy of the rail vehicle, the deformation amount of the cabin, the mean deceleration of passenger’s area (conformable to European standard), the maximum deceleration of the passenger’s area and the secondary impact velocity of the passenger (American standard). The degree of correlation among these results was discussed. The analyses showed that the horizontal collision position of the dump-truck and the collision speed had a comparatively large effect on the safety of passengers, and further that the mass of the load on the dump-truck also affected it when the secondary impact velocity was used as an evaluation index.

著者

島田 拓 臺丸谷 政志 小林 秀敏 藤木 裕行 シレガル ラクマド・アリフ

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2004, pp.193-194, 2004

---

This paper is concerned with the tensile strength and strain rate of concrete materials by means of the experimental method of reflected tensile stress waves. The experiment is conducted by the Hopkinson bar technique and it is based on the superposition and concentration of tensile stress waves reflected both from the free ends of a striking bar and a specimen bar. The impact tensile experiment for concrete materials was carried out and the tensile strength of concrete under impact loadings was discussed as well as the effect of strain rates. This study is focused on the measurement of strain rates using both strain gages and crack gages. It is found that the impact tensile strength of concrete is remarkably influenced by strain rates ranging from 10^0 to 10^2 sec^<-1>.

著者

石畑 祐輔 臺丸谷 政志 小林 秀敏 シレガル ラクマド アリフ

出版者

一般社団法人 日本機械学会

雑誌

材料力学部門講演会講演論文集

巻号頁・発行日

vol.2002, pp.689-690, 2002

著者

石畑 祐輔 臺丸谷 政志 小林 秀敏 シレガル ラクマド アリフ

出版者

一般社団法人 日本機械学会

雑誌

材料力学部門講演会講演論文集

巻号頁・発行日

vol.2002, pp.689-690, 2002

著者

臺丸谷 政志 小林 秀敏

出版者

The Society of Materials Science, Japan

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.60, no.7, pp.668-673, 2011

---

The Japanese sword is interesting not only from the viewpoint of traditional crafts of arts, but also from the aspect of modern science and technology because the way of making and its functionality as a weapon are really consistent with modern science. The present study is concerned with the joint between <i>tohshin</i> (blade) and <i>tsuka</i> (hilt) of the sword. Only one <i>mekugi-take</i> (retaining peg made of bamboo) with about 5mm in diameter holds <i>Nakago</i> (tang) in the hilt. However the slender <i>mekugi</i> might not be broken, even in the case of violent sword-fighting. This fact has been historically demonstrated in many battles by Japanese swords. In this study, using a Japanese sword model, it is examined theoretically and experimentally why a <i>mekugi</i> used in Japanese swords might not be broken from the viewpoint of impact engineering. Consequently, it is presumed that such a strong force as breaking <i>mekugi-take</i> does not act on it, because of the location of <i>mekugi-ana</i> (a hole for <i>mekugi</i>) in the tang, which has been made by following the traditional code of swordsmiths.

著者

小林 秀敏 富永 直路 堀川 敬太郎 渡辺 圭子

出版者

一般社団法人日本機械学会

雑誌

バイオエンジニアリング講演会講演論文集

巻号頁・発行日

vol.2012, no.24, pp."8G33-1"-"8G33-2", 2012-01-06

著者

臺丸谷 政志 小林 秀敏 藤木 裕行

出版者

一般社団法人日本機械学会

雑誌

材料力学部門講演会講演論文集

巻号頁・発行日

vol.2006, pp.449-450, 2006-08-03

著者

津田 紘 臺丸谷 政志 小林 秀敏

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.54, no.7, pp.734-740, 2005 (Released:2006-04-07)

参考文献数

15

被引用文献数

5 5

---

In this research, the effect of pre-fatigue on the impact tensile properties of the welded butt joint of high strength steel plates, HR590 and HR780, was investigated by means of the split Hopkinson bar method for tensile test. For comparison, quasi-static tensile tests were also performed to examine the effect of strain rate on the strength and the elongation. It was found that the effect of pre-fatigue on the tensile strength of welded butt joints is quite small if the applied stress in the pre-fatigue is less than the apparent yield stress of the welded butt joints. In the results of quasistatic and impact tensile tests for the welded butt joint of HR780 steel, however, the fracture strain of the specimens subjected to high cycle pre-fatigue was larger than that of the virgin specimens. This may be caused by the increase in hardness due to pre-fatigue observed in the weld zone of the joints.

著者

小林 秀敏

出版者

一般社団法人日本機械学会

雑誌

年次大会資料集

巻号頁・発行日

vol.2000, no.5, pp.106-107, 2000-07-31