Abstract
The paper reports experimental work carried out on a composite with a phenolic matrix and reinforced with glass fiber. The fatigue results were obtained on both unidirectional fiber composites and crossed fiber composites. For unidirectional fiber composites the two glass fiber treatments were investigated. All the fatigue tests were carried out on a mechanical fatigue machine equipped with frequency control and a furnace. The unidirectional composites were tested in the frequency range from 1.5 to 25 Hz and in the temperature range from 20 to 200°C. The crossed composites were tested in the frequency range from 2 to 20 Hz at 20°C. The paper discusses and draws conclusions about the fatigue damage in terms of variation of Young's modulus, the influence of the temperature and frequency on the fatigue strength and surface temperature variation during testing.
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