Accession Number : AD0764070

Title :   A Study on Fracture Toughness of Advanced Structural Composites.

Descriptive Note : Final rept. 15 Feb 72-23 Apr 73,

Corporate Author : NAVAL ACADEMY ANNAPOLIS MD

Personal Author(s) : Chang,George C.

Report Date : JUL 1973

Pagination or Media Count : 112

Abstract : Structural fracture in homogeneous, isotropic materials is discussed. Fundamental relations associated with linear elastic fracture mechanics, based on the Griffith-Irwin approach, are presented. Fracture mechanics of fiber reinforced composites are discussed, including some fracture test results of numerous composites, including beryllium/aluminum, glass/epoxy, Scotchply, boron/aluminum and graphite/polyimide. Some of the nonhomogeneous anisotropic composites are unidirectionally reinforced; others are angle-plied. The fracture phenomenon and process in filamentary composites are detailed. Recommendations for future work on fracture of structural composites for high- performance flight vehicles are outlined. (Author, modified-PL)

Descriptors :   (*COMPOSITE MATERIALS, *FRACTURE(MECHANICS)), TOUGHNESS, MECHANICAL PROPERTIES, STRESSES, CRACKS, REINFORCED PLASTICS, GRAPHITE, BORON, ALUMINUM, EPOXY RESINS, GLASS TEXTILES, BERYLLIUM

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE