Characterization of Boron/Aluminum Composite as an Orthotropic Elastic-Plastic Material.

摘要

Preliminary testing showed that Boron/aluminum displayed nearly linear elastic behavior up to failure when stressed in the fiber direction, but proved to be quite ductile in off-axis tests. Further, fatigue cracks could not be grown through the fibers but would always propagate parallel to the fibers irrespective of the initial orientation of the crack. An in-depth study of the room temperature tensile behavior of boron/aluminum composite was conducted. This behavior was accurately described using an orthotropic elastic-plastic constitutive model. An investigation into the crack-tip plastic zones in boron/aluminum was conducted both experimentally and analytically, and the results help explain the fatigue growth pattern. METAL-MATRIX COMPOSITES, BORON-ALUMINUM, ELASTIC-PLASTIC BEHAVIOR, ORTHOTROPIC MATERIAL, PLASTIC ZONES, CRACKS.