Accession Number : AD0489745

Title :   THE PROPAGATION OF SHOCK WAVES IN SEMILINEAR VISCOELASTIC MATERIALS.

Descriptive Note : Interim technical rept.,

Corporate Author : CALIFORNIA UNIV BERKELEY STRUCTURAL ENGINEERING LAB

Personal Author(s) : Lubliner, J. ; Secor, G. A.

Report Date : SEP 1966

Pagination or Media Count : 41

Abstract : A nonlinear viscoelastic material whose constitutive functional is represented by a multiple integral expansion, with the characteristic property that the instantaneous response is linear, is called semilinear. It is shown that, in a longitudinal impact on the end of a long bar of such a material, the velocity (or stress) is governed by a nonlinear integro-differential equation. If the velocity (or stress) is prescribed at the end of the bar, then the solution may be obtained in the form of a traveling wave, with the state variables behind the wave front expressed in the form of power series whose coefficients are obtainable by quadratures. A sample calculation exhibits the quantitative effects of nonlinear memory on wave propagation. The method used in the paper is also shown to be extendable to certain problems of three dimensional wave propagation. (Author)

Descriptors :   (*SHOCK WAVES, MECHANICAL WAVES), (*MECHANICAL WAVES, VISCOELASTICITY), RODS, SHOCK(MECHANICS), NONLINEAR SYSTEMS, WAVE PROPAGATION, MATHEMATICAL MODELS, RESPONSE, TIME, MATHEMATICAL ANALYSIS, STRESSES, VELOCITY, IMPACT SHOCK, PROPAGATION.

Subject Categories : Metallurgy and Metallography
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE