Accession Number : AD0775712

Title :   The General Plane Stress Failure of Boron Aluminum Composites. Part II. Phase I: Theoretical Analysis of Cylindrical Tubes for Characterization of Boron/Aluminum Composites. Phase II: Plasticity and Combined Loading Analysis of Cylindrical Tubes for Characterization of Boron/Aluminum Composites.

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

Corporate Author : WASHINGTON UNIV ST LOUIS MO MATERIALS RESEARCH LAB

Personal Author(s) : Vicario,A. A. ; Freeman,W. T. ; Stecher,P. F.

Report Date : NOV 1973

Pagination or Media Count : 40

Abstract : The purpose of the study is to determine the adequacy of laminate theory in predicting off-axis elastic modulus compared to finite element simulation of the response of boron/aluminum tubes. Gripping effects and stress distribution uniformity are considered for anisotropic tubes. The analysis indicates that in the gage section boron/aluminum behaves essentially as an isotropic material when t/D = or < 0.05. Consequently, the simplifying assumptions of shell theory can be directly applied to their analysis. It is concluded that (1) failure in the 'grip section' will be substantially less likely to occur than with boron or graphite/epoxy systems, (2) stresses will be nearly uniform in the gage section, and (3) only minor extraneous stress effects will be generated. (Modified author abstract)

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

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE