Three-Dimensional Analysis for the Stress Distribution Near Circular Holes in Laminated Composites.
VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF ENGINEERING SCIENCE AND MECHANICS
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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 090s, 900s and - 4545s 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
- Laminates and Composite Materials