Accession Number : AD0278543

Title :   ON RECOVERABLE INTERNAL ENERGY IN LINEAR VISCOELASTICITY

Corporate Author : BROWN UNIV PROVIDENCE R I DIV OF APPLIED MATHEMATICS

Personal Author(s) : BREUER,S. ; ONAT,E.T.

Report Date : JUL 1962

Pagination or Media Count : 1

Abstract : A linear viscoelastic solid is subjected to a given deformation history. A portion of the work done by the stresses during this deformation is converted into heat, while the remaining por ion increases the internal energy (per unit volume) of the solid. A fraction of the i crease in internal energy can be recovered by sub ecting the solid to a ppropriate future deformation. The paper is concerned with the question of maximizing the recoverable energy by means ofAN OPTIMUM FUTURE EFORMATION. It is shown that the determination of the optimum deformation requires the solution of an integral equa ion of the Wiener-Hopf type. This equation is solved in the case where the relaxation modulus is given as a sum of exponential functions. The maximum recoverable internal energy is then expressed as a functional of second degree of the given deformation history. It is observed that the maximum r coverable energy provi es a lower bound to the internal energy of the solid. It is hoped that use could be made of the concept of maximum recoverable energy in studies concerned with t e t ermodynamics of linear viscoelasticity. (Author)

Descriptors :   ENERGY, HEAT TRANSFER, INTEGRAL EQUATIONS, RELAXATION TIME, SOLIDS, STRESSES

Distribution Statement : APPROVED FOR PUBLIC RELEASE