Accession Number : ADA307777

Title :   Strength Characteristics of Composite Materials.

Descriptive Note : Contract rept.,

Corporate Author : PHILCO CORP NEWPORT BEACH CA

Personal Author(s) : Tsai, Stephen W.

PDF Url : ADA307777

Report Date : APR 1965

Pagination or Media Count : 100

Abstract : The strength characteristics of quasi-homogeneous, nonisotropic materials are derived from a generalized distortional work criterion. For unidirectional composites, the strength is governed by the axial, transverse, and shear strengths, and the angle of fiber orientation. The strength of a laminated composite consisting of layers of uni-directional composites depends on the strength, thickness, and orientation of each constituent layer and the temperature at which the laminate is cured. In the process of lamination, thermal and mechanical interactions are induced which affect the residual stress and the subsequent stress distribution under external load. A method of strength analysis of laminated composites is delineated using glass-epoxy composites as examples. The validity of the method is demonstrated by appropriate experiments. Commonly encountered material constants and coefficients for stress and strength analyses for glass-epoxy composites are listed in the Appendix.

Descriptors :   *STRESS ANALYSIS, *LAMINATES, *EPOXY COMPOSITES, *SHEAR STRENGTH, STRESS STRAIN RELATIONS, THICKNESS, LOAD DISTRIBUTION, TENSILE STRENGTH, MATRICES(MATHEMATICS), STRUCTURAL ANALYSIS, STIFFNESS, CRACKS, FIBER REINFORCED COMPOSITES, MODULUS OF ELASTICITY, GLASS, THERMAL EXPANSION, SHEAR STRESSES, RESIDUAL STRESS, FLEXURAL STRENGTH, YIELD STRENGTH, COMPRESSIVE STRENGTH, THERMAL DEGRADATION, AXIAL LOADS, TRANSVERSE, STRESS CONCENTRATION.

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE