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284 results on '"Takayama, Tetsuo"'

5. Poisson's Ratio Prediction of Injection Molded Thermoplastics Using Differential Scanning Calorimetry.

Author

Takayama, Tetsuo and Nagasawa, Yuuki

Subjects
*GLASS transition temperature, *DIFFERENTIAL scanning calorimetry, *MECHANICAL behavior of materials, *YOUNG'S modulus, *MELTING points
Abstract

In the development of thermoplastic products, it is necessary to conduct the necessary mechanical tests and evaluate the reliability of thermoplastics in each case, because the mechanical properties of the same material vary depending on the molding process conditions and product shape. In order to build a sustainable society, it is expected that the evaluation of the mechanical properties of thermoplastics, which are resource and energy saving, will be required. In this paper, the glass transition temperature and melting point of injection-molded thermoplastics were evaluated by differential scanning calorimetry, and the correlation between Poisson's ratio and free volume was obtained by applying the theory proposed by Flory et al. A certain correlation was found between the Poisson's ratio of polymers and the change in free volume determined by the glass transition temperature. It is also clear that this relationship can be approximated by orders of magnitude. The Poisson's ratio of the core layer tended to be smaller than that of the skin layer. It has also been found that there is a negative correlation between the Young's modulus and the free volume of the polymer material. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Improving the Accuracy of the Evaluation Method for the Interfacial Shear Strength of Fiber-Reinforced Thermoplastic Polymers through the Short Beam Shear Test.

Author

Jiang, Quan, Takayama, Tetsuo, and Nishioka, Akihiro

Subjects
*SHEAR strength, *FIBER-reinforced plastics, *EVALUATION methodology, *FIBER orientation, *CELLULOSE fibers, *REINFORCED thermoplastics, *MICROFIBERS
Abstract

Short fiber-reinforced thermoplastic polymers (SFRTPs) are commonly used in various molding methods due to their high specific elasticity and strength. To evaluate the interfacial strength, several determination methods have been proposed, including the interfacial shear strength (IFSS). In previous research, an IFSS evaluation method based on the short beam shear method was proposed. However, this method is only applicable to micrometer-sized fibers with high stiffness levels that are not easily bent. When utilizing cellulose fiber, the interfacial shear strength (IFSS) results frequently exhibit significant deviations. To tackle this issue, we suggest an enhanced experimental technique that employs beam-shaped specimens with welding points based on the short beam shear test. Furthermore, we conducted a three-dimensional analysis of the original method to determine the fiber orientation angle and IFSS. The outcomes were compared with previously reported determinations. The IFSS achieved through the novel method proposed in this paper exhibits high precision and reliability, rendering it suitable for use with soft and flexible fibers. [ABSTRACT FROM AUTHOR]

Published
2024
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39. Abstracts of selected papers presented at the 76th General Meeting of the Japanese Society of Gastroenterology March 29–31, 1990, Tokyo, Japan

Author

Kumada, Hiromitsu, Arase, Yasuji, Akahane, Yoshihito, Miyazaki, Yoshiki, Tanaka, E., Sodeyama, T., Koga, Michiaki, Yano, Michitami, Yamada, Gotaro, Tsuji, Takao, Hayashi, Norio, Kamada, Takenobu, Omata, Masao, Yokosuka, Osamu, Hino, Kunihiko, Kurai, Kiyohiko, Nakamura, Takashi, Tamura, Yumiko, Saigenji, Katsunori, Yamagata, Susumu, Fukutomi, Hisayuki, Saeki, Susumu, Nakashima, Takatoshi, Kawano, Sunao, Sato, Nobuhiro, Nakamura, Masahiko, Oda, Masaya, Kitajima, M., Ikeda, Y., Watanabe, Yozo, Tsumura, Hidenori, Aoki, Teruaki, Kashiwagi, Hideyuki, Hayakawa, Tetsuo, Shibata, Tokimune, Isaji, Shuji, Mizumoto, Ryuji, Kimura, Toshinari, Furukawa, Masayuki, Takeyama, Yoshifumi, Saitoh, Yoichi, Atomi, Y., Yamagishi, T., Nonaka, Atsushi, Manabe, Tadao, Kyogoku, Takahisa, Tamura, Koichiro, Tobe, Takayoshi, Ishibashi, Tadaaki, Ochi, Koji, Yoshioka, Utako, Inoue, Hisayuki, Mizukami, Yuji, Hirabayashi, Yasushi, Noda, Aiji, and Takayama, Tetsuo

Published
1991
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40. Abstracts of Selected Papers Presented at the 31st Annual Meeting of the Japanese Society of Gastroenterology

Author

Karasawa, Eii, Saisho, Hiromitsu, Maguchi, Hiroyuki, Obara, Tsuyoshi, Saeki, Keizo, Yamasuji, Tadashi, Nishihara, Kenji, Suzuki, Takasi, Tajiri, Hisato, Ozaki, Hideo, Fujii, D., Suyama, M., Mogaki, Masatoshi, Fujii, Hideki, Yamamoto, Toshio, Isaji, Shuji, Itoh, Tohru, Idezuki, Yasuo, Baba, Nobuo, Manabe, Tadao, Imaizumi, Toshihide, Hanyu, Fujio, Tanno, Naoaki, Ishizuka, Jin, Yamamoto, F., Igimi, H., Yamamoto, S., Shimura, H., Takayama, Tetsuo, Noda, Aiji, Hirata, Nobuto, Kadowaki, Ken, Yazaki, Yasuyuki, Namiki, Masayoshi, Yamada, Hideo, Kouzu, Teruo, Ichikawa, Kazuo, Ichikawa, Masafumi, Seki, Hideichi, Kimura, Ken, Matsushiro, Takashi, Yamaguchi, Hisashi, Yamagata, Rin, Fujio, Toshiyuki, Furukawa, Masato, Kawata, Sumio, Imai, Yasuharu, Amuro, Yoshiki, Kudo, Kei, Nishimura, H., Akiyama, K., Tsukahara, Koushou, Kitani, Kenichi, Katagiri, K., Nakai, T., Watanabe, Norihito, Oda, Masaya, Takikawa, Hajime, Yamanaka, Masami, Sakisaka, Shotaro, Tanikawa, Kyuichi, Igimi, H., Kakazu, T., Tanaka, Naomi, Shoda, Junichi, Tazuma, Susumu, Kajiyama, Goro, Chijiiwa, Kazuo, Nakayama, Fumio, Hikasa, Yutaka, Tanida, Noritoshi, Narisawa, Tomio, Takahashi, Masahiro, Tanaka, Masahiro, Kimura, Ken, Matsumoto, Haruki, Kojima, Koichi, Takeda, Isao, Nakano, Satoshi, Shiina, Yasubumi, Harasawa, Shigeru, Okuyama, Shuji, Hara, Hisato, Iwafuchi, Mitsuya, Watanabe, Hidenobu, Morizumi, H., Matsumura, M., Sato, Akira, Asaki, Shigeru, Hosokawa, Yoshio, and Hirao, Masanori

Published
1991
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