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Micromechanics Of Fiber-Reinforced Composites

Report Number: AFML TR 65-283
Author: Alexander, E. L.
Author: Caputo, A. A.
Author: Prado, M. E.
Author: Hilzinger, J. E.
Corporate Author: Rocketdyne Canoga Park Calif Research Dept
Laboratory: Air Force Materials Laboratory
Date of Publication: 1965-11
Pages: 168
Contract: AF 33(615)-1627
Project: None Given
AD Number: AD0623644

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.

Lockheed Martin Missiles & Fire Control
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