Accession Number : AD0771796

Title :   A Study of Fracture Phenomena in Fiber Composite Laminates. Volume III.

Descriptive Note : Final rept. 1 Nov 71-31 Aug 73,

Corporate Author : CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Konish,H. J. , Jr. ; Cruse,T. A.

Report Date : SEP 1973

Pagination or Media Count : 126

Abstract : The extension of linear elastic fracture mechanics from ostensibly homo-geneous isotropic metallic alloys to heterogeneous anisotropic advanced fiber composites is considered. It is analytically demonstrated that the effects of material anisotropy do not alter the principal characteris-tics exhibited by a crack in an isotropic material. The heterogeneity of fiber composites is experimentally shown to have a negligible effect on the behavior of a sufficiently long crack. A method is proposed for predicting the fracture strengths of a large class of composite laminates; the values predicted by this method show good agreement with limited experimental data. The limits imposed by material heterogeneity are briefly discussed, and areas for further study are recommended. (Author-PL)

Descriptors :   *Composite materials, Laminates, Fracture(Mechanics), Stresses, Fibers, Anisotropy

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE