The General Plane Stress Failure of Boron Aluminum Composites. Part I.
Final technical rept. 17 May 71-15 Jun 72,
WASHINGTON UNIV ST LOUIS MO MATERIALS RESEARCH LAB
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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 boronaluminum 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
- Laminates and Composite Materials