Reducing edge delamination stresses in composite plates using multiobjective optimization
Abstract
This paper addresses the development of an optimization procedure for the reduction of interlaminar stresses in composite plates. The goal is to reduce the interlaminar stress trends at the free edges of composite plates subjected to a uniaxial compressive loading or a bending moment. A simplified analytical method is used for predicting the free edge delamination stresses. Ply orientations are used as design variables and constraints are imposed upon the in-plane material-axis ply stresses, the buckling load and the interlaminar normal stress at the interior of the plate. The problem is formulated with multiple design objectives and the Kreisselmeier-Steinhauser multiobjective optimization technique is used to solve the nonlinear problem. The procedure yields reductions in interlaminar stresses. Results are presented and compared with a reference or baseline design for four Gr/Ep composite plates with symmetric ply arrangements.
- Publication:
-
Aerospace Design Conference
- Pub Date:
- February 1993
- Bibcode:
- 1993asd..confV....F
- Keywords:
-
- Axial Compression Loads;
- Bending Moments;
- Delaminating;
- Graphite-Epoxy Composites;
- Interlaminar Stress;
- Reinforced Plates;
- Fiber Composites;
- Optimization;
- Structural Design Criteria;
- Structural Mechanics