Accession Number : AD0871745

Title :   Statistical Theories of Strength of Bundles and Fiber-Reinforced Composites.

Descriptive Note : Summary rept. 1 Feb 69-31 Jan 70,

Corporate Author : POLYTECHNIC INST OF BROOKLYN NY

Personal Author(s) : Armenakas, A. E. ; Garg, S. K. ; Sciammarella, C. A. ; Svalbonas, V.

Report Date : MAY 1970

Pagination or Media Count : 103

Abstract : This report contains a review of the statistical theories of compositestrength for conditions of static and quasi-static loading. Startingwith the strength distribution of a fiber through the Daniels bundletheory, Gucer-Gurland-Rosen model of cumulative weakening of thecomposite and the Zweben model of crack propagation in the compositestructure. The case when a few isolated fiber breaks are observedprior to failure is briefly considered. The stochastic process modelfor the breakdown of a perfect fiber is presented. Its similarityto the Gucer-Gurland-Rosen model of composite strength is pointed out.The theory of breaking kinetics for a first order ensemble of fibers (nomemory effects) IS DISCUSSED FOR A FIBER AND FOR AN IDEAL AND A TIGHTBUNDLE. The generalized theory of breaking kinetics (including memoryeffects) is outlined. The relevant statistics and probability arereviewed. Special attention has been paid to applications to practicalproblems. The limitations and advantages of various theories arediscussed. (Author, modified-PL)

Descriptors :   (*COMPOSITE MATERIALS, LOADS(FORCES)), STATISTICAL ANALYSIS, CRACK PROPAGATION, GLASS TEXTILES, REINFORCED PLASTICS, FIBERS.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE