Accession Number : AD0686162

Title :   LONGITUDINAL WAVES IN NONLINEAR VISCOELASTIC RODS UNDER INITIAL AXIAL STRESS.

Descriptive Note : Summary rept.,

Corporate Author : STATE UNIV OF NEW YORK BUFFALO DIV OF INTERDISCIPLINARY STUDIES AND RESEARCH

Personal Author(s) : Cozzarelli,Francis A. ; Tang,Sam

Report Date : FEB 1969

Pagination or Media Count : 71

Abstract : Longitudinal wave propagation in a semi-infinite rod is considered, where the medium is nonlinear viscoelastic and under constant initial axial stress, i.e., the rod is undergoing axial creep deformation. The deformation gradient is assumed to be infinitesimal, but the deformation itself may be finite. The constitutive law is taken with stress power functions in the elastic, transient creep and steady creep terms. A wave is generated by a step input in velocity or stress at one end of the rod. It is assumed that the initial stress is much greater then the increment of stress generated by the impact and a perturbation technique is employed. Closed form perturbation stress solutions are obtained for five nonlinear viscoelastic models. Numerical examples are given and discussed. (Author)

Descriptors :   (*MECHANICAL WAVES, RODS), PROPAGATION, CREEP, VISCOELASTICITY, STRESSES, MATHEMATICAL MODELS, NUMERICAL ANALYSIS

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE