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MICROMECHANICS OF FIBER-REINFORCED COMPOSITES.
ROCKETDYNE CANOGA PARK CALIF RESEARCH DEPT
Research on the micromechanical behavior of composites reinforced with boron and other fibers is reported. A wide variety of reinforcing elements were used in photoelastic matrix materials to form beams, plates, and three-dimensional microspecimens of varied configurations. The effects of reinforcing element modulus and elongation were investigated in beams in four- and three-point loading. The degree of stiffening derived from various filament reinforcing materials was defined, and different failure mechanisms were investigated. Reinforced plates were biaxially tested, and fiber unbonding, buckling, and the subsequent stress redistribution were observed photoelastically. Significant advances in microphotoelasticity are reported. Very small specimens were loaded, and sharp microscopic photoelastic stress patterns including induced flaw points were photographed. The filament configurations represent typical laminate geometries, and small flaws were seen to have a remarkably wide field of influence. Author
Rept. for 1 Jul 64-30 Jun 65,
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AF33 615 1627