Modelling the thermomechanical behaviour of shape memory polymer materials

Sinha, RP and Jarali, Chetan S and Raja, S (2011) Modelling the thermomechanical behaviour of shape memory polymer materials. Indian Journal of Engineering and Materials Sciences, 18 . pp. 15-23. ISSN 0971-4588

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    Abstract

    The increasing applications of smart structures in technology development have led to a wide variety of new high perfdormance materials, especially smart polymers. In the present work, a uniaxial model for shape memory polymer (SMP) is analyzed and a consistent form of the constitutive law is proposed. The coefficient of thermal expansion is expressed using the rule of mixtures approach. In this study, a copmparison is made between thermal strains computed by using the analogous rule of mixtures approach. In this study, a comparison is made between thermal strains computed by using the analogous rule of mixture equation and the empirical relation that has been stated on the basis of experimental findings. The inconsistency in the computation of coefficient of thermal expansion is addressed. Furthermore, the consistent form of the stored strain and thermal strain expressions are also presented using fourth order Runge-kutta method. A noteworthy difference is observed due to change in temperature. Moreover, the difference between the proposed analytical solutions with the empirical relation is brought out. Finally, the consistent form of the constitutive model with modified CTE and strain expressions for the SMP is presented.

    Item Type: Journal Article
    Additional Information: Copyright for this article belongs to National Institute Science Communication Information Resource
    Uncontrolled Keywords: Shape memory polymer;Shape memory effect;Constitutive model
    Subjects: AERONAUTICS > Aeronautics (General)
    CHEMISTRY AND MATERIALS > Composite Materials
    ENGINEERING > Structural Mechanics
    Division/Department: Other, Other, Structures Division
    Depositing User: Ms. Alphones Mary
    Date Deposited: 26 Mar 2012 10:31
    Last Modified: 26 Mar 2012 10:31
    URI: http://nal-ir.nal.res.in/id/eprint/10390

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