Accession Number : AD0775710

Title :   The General Plane Stress Failure of Boron Aluminum Composites. Part I.

Descriptive Note : Final technical rept. 17 May 71-15 Jun 72,

Corporate Author : WASHINGTON UNIV ST LOUIS MO MATERIALS RESEARCH LAB

Personal Author(s) : Collins,B. R. ; Thomas,R. L.

Report Date : NOV 1973

Pagination or Media Count : 146

Abstract : The behavior of a fiber reinforced composite subjected to a general biaxial stress state is discussed in terms of the experimental sensitivity required to precisely define the parameters of an assumed functional form of the limit surface. The experimental portion of the program characterized plate and tubular specimens of boron reinforced aluminum. The stress analysis for the potentially nonuniform stress states in the tubes are presented and it is concluded that the thin walled cylindrical tube is an ideal specimen for the intended characterization of this program. Off-axis tensile tests and other simple combined loading tests are shown to lack the appropriate sensitivity for the parametric evaluation of the limit surface functional form. The effects of repressing boron/aluminum plates and the sequential processing of tubes from various broadgood forms is shown to be either beneficial or deleterious depending on the total amount of processing at various fabrication parameters. (Modified author abstract)

Descriptors :   *Fiber reinforced composites, Aluminum alloys, Boron, Tubes, Failure(Mechanics), Stresses, Matrix materials, Metals

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE