ポリウレタン系形状記憶ポリマーのサーモメカニカル特性構成式のモデル化

概要

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In order to describe the thermomechanical properties in shape memory polymer of polyurethane series, a thermomechanical constitute model is developed by modifying a standard linear viscoelastic model. The model involves a slip element due to internal friction and takes account of thermal expansion. In order to describe the variation in mechanical properties due to glass transition. coefficients in the model are expressed by a single exponential function of temperature. Several kinds of thermomechanical tests are carried out. The proposed theory expresses well the thermomechanical properties of the material, such as shape fixity. shape recovery and recovery stress. The proposed model is useful for design of shape-memory polymer elements, in which the amount of recovery deformation, the tightening force and the working start and completion temperature are specified.
社団法人日本機械学会の論文
1998-01-25