日本複合材料学会誌
Online ISSN : 1884-8559
Print ISSN : 0385-2563
ISSN-L : 0385-2563
研究論文
分子動力学法によるポリプロピレンの熱粘弾性挙動の数値シミュレーション
影山 友哉小柳 潤喜多村 竜太荻原 慎二
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2016 年 42 巻 2 号 p. 82-87

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Generally, polymer materials such as polypropylene shows a strong time and temperature dependence (viscoelastic behavior). It is reported that deformation could be predict by applying time–temperature superposition principle to long-term viscoelastic behavior. In this study, whether time–temperature superposition principle completed in deformation was checked using a molecular dynamics. Therefore, stress-relaxation test and constant strain rate tensile test were employed for amorphous polypropylene by molecular dynamics. Stress-relaxation tests were performed in 5 temperature standards, and relaxation moduli were gotten. Using the results, master curve was drawn, and shift factor were gotten. Next, the constant strain rate tensile tests were performed in 4 strain speed and 5 temperature standards. The results agree well with the theory curve that demanded from the parameter mentioned above, and Arrhenius equation was applied between temperature–time. Furthermore, the temperature dependence of the volume was checked, and a flexural point was occurred in shift factor. This flexure point almost accorded with a glass transition point (307[K]). It was suggested that time–temperature superposition principle completed in the small transformation of polymer materials.
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