Accession Number : ADP001025

Title :   Stress Solutions at Bondline-Boundary Intersections in Composite Materials,

Corporate Author : ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA

Personal Author(s) : Bowie,Oscar L. ; Freese,Colin E. ; Tracey,Dennis M.

Report Date : FEB 1983

Pagination or Media Count : 12

Abstract : Various analytical studies in planar elasticity have shown that the stress state can be singular at bondline-boundary intersections in composite materials. The singularity has the form r sub lambda-1 with lambda in the range (0, 1) and dependent upon the elastic properties of the composite. Here the authors present an asymptotic analysis for the case of a bondline which is perpendicular to a traction free boundary. The analysis applies to any composite consisting of perfectly bonded dissimilar isotropic materials. Whereas previous analyses have limited attention to the characteristic equation for lambda, they present in addition the equations for the angular form of the singular field. The practical problem of a bimaterial tension strip which has a singular elasticity solution was analyzed using the finite element method. Results show that the free surface singularity strongly influences the global solution and that very accurate solutions can be obtained by using singularity elements. (Author)

Descriptors :   *Equations, *Stresses, *Composite materials, *Elastic properties, Finite element analysis, Displacement, Solutions(General), Isotropism, Interactions

Distribution Statement : APPROVED FOR PUBLIC RELEASE