SMP複合材料の形状固定性のマイクロメカニックスによるモデル化

概要

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Deformation induced in a shape memory polymer in its rubber state under an applied load may be fixed at a lower degree of temperature than its glass transition temperature when the load is removed. In this study, micromechanical modeling of such a shape fixity effect of the SMP is examined and its magnitude of shape fixity coefficients, which implies the ratio of the residual strain to the initial applied strain in the rubber state, is expressed as a function of the elastic moduli of the SMP. Moreover, a SMP composite material containing many non-shape fixed fillers is modeled by using the eigenstrains for constituents of the composite. It is demonstrated that its macroscopic shape fixity coefficient can be expressed in terms of these eigenstrains successfully. The magnitude of the shape fixity coefficient of the composite material decreases with increase in the aspect ratio of the constitutive sheroidal reinforcement.
2010-12-25