Abstract
Fatigue tests were conducted on injection-molded short glass and carbon fiber reinforced thermo-plastic composites under alternating plane bending stresses. The effects of the matrix, fiber-matrix adhesion and fiber orientation on fatigue strength characteristics were investigated in comparisons with nylon 6 (N 6), polyethersulfone (PES) and polyetheretherketone (PEEK) composites on the basis of the fractographic examinations. The short fiber reinforcement is found to be anisotropic in fatigue strength characteristics. It is indicated that in general, short fiber reinforcements seem to be more effective in improving the fatigue strength for the lower strength matrices, N 6 and PES, but not always for the higher strength matrix, PEEK.
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