Accession Number : ADA337848

Title :   Material Failure Mechanisms in Nonlinear Solids and Structures

Descriptive Note : Final rept. 1 Apr 95-31 Dec 97

Corporate Author : VIRGINIA UNIV CHARLOTTESVILLE SCHOOL OF ENGINEERING AND APPLIED SCIENCE

Personal Author(s) : Horgan, Cornelius O. ; Johnson, Wills

PDF Url : ADA337848

Report Date : FEB 1998

Pagination or Media Count : 19

Abstract : This work was concerned with research on the fundamental mechanics and mathematics of material failure mechanisms in nonlinear solids and structures. The specific areas investigated were those of void nucleation and growth due to large deformations in nonlinear solids and end effects in anisotropic and laminated structures. Research on cavitation phenomena, which serve as a precursor to fracture, is crucial to the understanding of failure mechanisms in rubber-like solids (e.g. polymers, solid rocket propellants, aircraft tires) and of ductile fracture processes in metals. In particular, the work is relevant to the tire degradation problems of concern to Air Force scientists at Wright Patterson AFB. Mathematically, the work involved investigation of singular solutions of the second-order quasi linear system of partial differential equations describing equilibrium states of nonlinearly elastic bodies. For radially symmetric deformations, the basic problem reduces to a bifurcation problem for a single second-order nonlinear ordinary differential equation. Particular emphasis was placed on the effect of material inhomogeneity, compressibility and anisotropy on void nucleation and growth, including non-axisymmetric problems.

Descriptors :   *RUBBER, *ANISOTROPY, *HETEROGENEITY, *COMPRESSIVE PROPERTIES, DEGRADATION, POLYMERS, NUCLEATION, VOIDS, FRACTURE(MECHANICS), PARTIAL DIFFERENTIAL EQUATIONS.

Subject Categories : Elastomers and Rubber
      Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE