著者

竹下 英之 榎本 和城

出版者

一般社団法人 日本機械学会

雑誌

年次大会 2011 (ISSN:24242667)

巻号頁・発行日

pp._G040021-1-_G040021-3, 2011-09-11 (Released:2017-06-19)

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Recently, from the viewpoint that decreases the load to the global environment, the bio-plastics, which are derived from the reusable resources from the biomass, attract much attention as new polymeric materials instead of the polymers derived from exhaustible resources such as petroleum. Poly lactic acid (PLA) is considered to be one of the most promising bio-plastics because its strength and modulus are as high as that of the existing plastic, and it has also biodegradability. In this study, we investigated the effect of immersion in gasoline on mechanical properties of injection-molded PLA plates in the case of assuming that PLA will be applied to severe environment such as in contact with gasoline.

著者

竹内 彩陽 金子 堅司 榎本 和城

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 : JSME annual meeting

巻号頁・発行日

vol.2008, no.6, pp.263-264, 2008-08-02

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In this study, effects of viscosity and aging on plastic behavior of A7475 aluminum alloy under biaxial loading and in stress relaxation at several temperatures, are investigated experimentally, and are analyzed theoretically based on the Two-Factors constitutive concept, which means the overstress concept including aging effect. As much as temperature become higher, viscosity stress increases, on the other hand, aging stress decreases. Both viscosity and aging in axial loading are larger than those in torsional loading. The model based on Two-Factors constitutive concept gives systematic predictions on both plastic flow behavior and relaxation behavior for each loading direction.