Stress Analysis and Damage Modeling of Textile Composites
Abstract
Micromechanics of woven fabrics is studied using three dimensional finite elements which flow detailed modeling of the geometric complexities of the yarns and spatial material variations within the fabric. The undulation of the yarns combined with the varying cross-section profile of the yarn causes geometric nonlinear effects to influence the weave response. Material nonlinearity combined with high local stress fields can result in a variety of damage mechanisms such as matrix cracking, fiber breakage, and delamination which influence the overall properties of the composite. Damages in the composite constituents are modeled on a continuum basis and related to its material constitutive behavior. The 3D constitutive laws describing matrix and yam behavior are developed using a damage mechanics based approach with the dissipated energy density as the damage parameter. The strain energy dissipation (SED) concept is employed to describe the damage state and current stiffness of the weave constituents. The constitutive laws for the materials are implemented through an user-defined subroutine and linked with the finite element analysis program, ABAQUS. A progressive failure analysis of plan woven fabrics subjected to tension and in-plane shear is performed considering both geometric and material nonlinearities. The initiation and progression of damage within the fabric is investigated and the significant damage mechanisms outlined.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1999
- Accession Number
- ADA368289
Entities
People
- Gerry V. Flanagan
- Manohar G. Kollegal
- Sailendra N. Chatterjee