Accession Number : ADA305652

Title :   Finite Element Models for Predicting Crack Growth Characteristics in Composite Materials,

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG COLL OF ENGINEERING

Personal Author(s) : Buczek, Matthew B. ; Herakovich, Carl T.

PDF Url : ADA305652

Report Date : OCT 1982

Pagination or Media Count : 142

Abstract : Two dimensional and quasi-three dimensional, linear elastic finite element models for the prediction of crack growth characteristics, including crack growth direction, in laminated composite materials are presented. Mixed-mode crack growth in isotropic materials, unidirectional and laminated composites is considered. The modified crack closure method is used to predict the applied load level for crack extension and two new failure theories, modifications of the point stress and the Hashin failure criteria, are proposed to predict the direction of crack extension in composites. Comparisons are made with the Tsai-Wu failure criterion and the Sih strain energy density criterion as well as with experimental results. It is shown that the modified versions of point stress and Hashin criteria compare well with experiment. (AN)

Descriptors :   *LAMINATES, *FRACTURE(MECHANICS), *CRACK PROPAGATION, STRESS STRAIN RELATIONS, MATHEMATICAL MODELS, DENSITY, LOAD DISTRIBUTION, STRESS ANALYSIS, FINITE ELEMENT ANALYSIS, TENSILE STRESS, CRACKING(FRACTURING), FIBER REINFORCED COMPOSITES, MODULUS OF ELASTICITY, MATRIX MATERIALS, ENERGY TRANSFER, STRENGTH(MECHANICS), MATHEMATICAL PREDICTION, APPROXIMATION(MATHEMATICS), TENSION, FAILURE(MECHANICS), DELAMINATION, GRAPHITE EPOXY COMPOSITES, TRANSVERSE, UNIDIRECTIONAL.

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE