Abstract

This paper deals with the optimum design of multiaxially laminated fibrous composites under probabilistic conditions of loads and material properties. The first-ply-failure criterion is adopted, and the reliability analysis of biaxial, triaxial, and tetra-axial laminates under the probabilistic inplane stresses is conducted by a method based on the advanced first-order second-moment method. The optimum fiber orientation angles of the multiaxial laminates are determined based on reliability. The optimum fiber orientation angles are found to be much different

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