圧縮速度の急変を受けたガラス状高分子の過渡的力学緩和挙動

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  • 吉岡 真弥
    大阪市立大学大学院工学研究科機械物理系専攻
  • 増田 竜輝
    大阪市立大学大学院工学研究科機械物理系専攻

書誌事項

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  • Transient Mechanical Relaxation Behavior of Glassy Polymers Subjected to a Stepwise Change of Compression Rate
  • アッシュク ソクド ノ キュウヘン オ ウケタ ガラスジョウ コウブンシ ノ カト テキチカラガク カンワ キョドウ

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<p>Transient single relaxation time τSS of glassy polymers was evaluated by using a nonlinear single relaxation model during uniaxial compression processes in which the compression rate changed stepwise from εn1 to εn2. After the change of compression rate, stress showed an undershoot (εn1 > εn2) or an overshoot (εn1 < εn2) before reaching the same value as the constant-rate compression at εn2. After a decrease of compression rate, τSS increased monotonously to the steady value at εn2. When the compression rate increased, τSS showed a discontinuous increase right after the acceleration, then steeply decreased to the steady value at εn2. Transient values of τSS after a decrease of compression rate as a function of the nonlinear flow rate εη of the dashpot in the model were almost the same function as the steady value of τSS, which was almost inversely proportional to εη. After an increase of compression rate and also in the transient state under the constant rate compression, τSS (εη) showed a higher value than those in the steady flow state. This observation indicates that, when glassy structures are getting unstable due to deformation, the nonlinear flow requires larger stress than the steady flow.</p>

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