Abstract
The shear moduli of the unidirectional graphite-epoxy composites and the matrix material 'epoxy' under compressive load were measured by torsion tests. The compressive failure tests were also carried out and the acoustic emission was measured. The shear modulus of epoxy did not decrease until a high compressive strain was applied. Therefore, the previous theories for the compressive strength which require the decrease of shear modulus of epoxy under the compressive stress should be questioned. Young's modulus and the shear modulus of composites suddenly decreased at a load about 10-20% lower than the compressive fracture load, and the numbers of events of acoustic emission rapidly increased. Scanning electron micrographs have shown that the section of the failed fiber is skewed and stepwise, (characteristics different from those of the tensile fracture). The stresses caused by the difference between Poisson's ratio of the fiber and that of the matrix under a compressive load and the thermal residual stres...
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