Three-Dimensional Analysis for the Stress Distribution Near Circular Holes in Laminated Composites.
Abstract
A three-dimensional finite-element solution for the state of stress in a laminated composite with a circular hole, loaded in axial extension, is presented. Each layer of the laminate is assumed to be homogeneous and to have orthotropic properties. A curved isoparametric element with 24 nodal points and 72 degrees-of-freedom is used to model the individual layers of the laminate. The nodal displacements are determined by minimizing the total potential energy of the system at the element level with a conjugate gradient iterative method. Three symmetric stacking sequences ((0/90)s, (90/0)s and (- 45/+45)s) are investigated for both thick and thin boron-epoxy laminates. The results presented include inter-laminar stresses in the vicinity of a circular hole in the laminate. (Author-PL)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1974
- Accession Number
- AD0783504
Entities
People
- Jon R. Dana
- Richard M. Barker
Organizations
- Virginia Tech