Journal
MECHANICS OF MATERIALS
Volume 33, Issue 10, Pages 545-554Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0167-6636(01)00075-8
Keywords
shape memory polymer; polyurethane; glass transition; constitutive equation; shape recovery; shape fixity; thermomechanical property; nonlinear model
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A nonlinear thermomechanical constitutive model of shape memory polymer (SMP) is developed by modifying a linear model. The coefficients in the model are expressed by the single exponential functions of temperature in order to describe the variation in mechanical properties of the material due to the glass transition. The proposed theory expresses well the thermomechanical properties of polyurethane-shape memory polymer, such as shape fixity, shape recovery and recovery stress. The proposed model is useful for design of shape-memory polymer elements. (C) 2001 Elsevier Science Ltd. All rights reserved.
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