Accession Number : ADA190025

Title :   A Finite Element Analysis of Adhesively Bonded Composite Joints Including Geometric Nonlinearity, Nonlinear Viscoelasticity, Moisture Diffusion, and Delayed Failure.

Descriptive Note : Final rept. Jun 84-Nov 87,

Corporate Author : VIRGINIA TECH CENTER FOR ADHESION SCIENCE BLACKSBURG

Personal Author(s) : Roy, S ; Reddy, J N

PDF Url : ADA190025

Report Date : Dec 1987

Pagination or Media Count : 102

Abstract : A two-dimensional finite-element computational procedure is developed for the accurate analysis of the strains and stresses in adhesively bonded joints. The large displacements and rotations experienced by the adherends and the adhesive are taken into account by invoking the updated Lagrangian description of motion. The adhesive layer is modeled using Schapery's nonlinear single integral constitutive law for uniaxial and multiaxial states of stress. Effect of temperature and stress level on the viscoelastic response is taken into account by a nonlinear Fickean diffusion model in which the diffusion coefficient is dependent on the penetrant concentration and the dilatational strain. A delayed failure criterion based on the Reiner-Weisenberg failure theory has also been implemented in the finite element code. The applicability of the proposed models is demonstrated by several numerical examples.

Descriptors :   *ADHESIVE BONDING, *BONDED JOINTS, *COMPOSITE STRUCTURES, ADHESION, CODING, COMPUTATIONS, DIFFUSION, DIFFUSION COEFFICIENT, DISPLACEMENT, FINITE ELEMENT ANALYSIS, GEOMETRY, LAGRANGIAN FUNCTIONS, MODELS, MOISTURE, MOTION, NONLINEAR SYSTEMS, RESPONSE, STRESSES, TWO DIMENSIONAL, VISCOELASTICITY

Subject Categories : Couplers, Fasteners, and Joints
      Laminates and Composite Materials
      Adhesives, Seals and Binders

Distribution Statement : APPROVED FOR PUBLIC RELEASE