Accession Number : ADA307702

Title :   Analyses of Composite Structures.

Descriptive Note : Annual rept. Jan 65-Jan 66,

Corporate Author : PHILCO CORP NEWPORT BEACH CA

Personal Author(s) : Tsai, Stephen W. ; Adams, Donald F. ; Doner, Douglas R.

PDF Url : ADA307702

Report Date : NOV 1966

Pagination or Media Count : 234

Abstract : The stiffness and strength analyses of composite materials previously presented have been reviewed and extended to cross-ply and helical-wound cylinders, as well as flat laminates. Consideration has been given to the composite behavior after initial yielding, including the influence of filament crossovers in helical-wound cylinders. In doing so, a modified 'netting analysis' has been used in conjunction with the continuum analysis to predict both initial yielding and post-yielding behavior. Cylinders were assumed to be subjected to various loading conditions, including axial tension and compression, torsion, and internal pressure. Theoretical results were then compared with experimental data obtained using glass-epoxy composites. Investigations have also been made of the relative contributions of the constituent material properties to the gross behavior of a unidirectional fiber-reinforced composite when subjected to various loading conditions. Theoretical values obtained for the prediction of the stiffness and strength of the composite as a function of constituent properties have been compared with experimental data obtained using both glass-epoxy and boron-epoxy systems. Complete digital computer programs, developed in conjunction with the strength analyses of flat laminates and laminated composite cylinders, and the investigation of stress distributions in the fibers and matrix of a composite subjected to either longitudinal shear or transverse normal loading, are presented in Appendices A, B, and C.

Descriptors :   *LAMINATES, *FIBER REINFORCED COMPOSITES, *STRENGTH(MECHANICS), *SHEAR STRESSES, SHEAR PROPERTIES, COMPUTER PROGRAMS, COMPOSITE MATERIALS, STIFFNESS, ELASTIC PROPERTIES, COMPOSITE STRUCTURES, CYLINDRICAL BODIES, GLASS FIBERS, TENSION, FILAMENTS, YIELD STRENGTH, EPOXY COMPOSITES, COMPRESSIVE STRENGTH, DIGITAL COMPUTERS, TORSION, ELECTRIC CONNECTORS, TRANSVERSE, UNIDIRECTIONAL, INTERNAL PRESSURE.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE