Abstract
Fatigue tests were performed on central hole notched specimens made of acrylic casting dispersions particulate composites. Three compositions with different volume fraction of filler and different particle size were analysed. The tests were conducted at two temperatures and two stress ratios. Constant and block variable loading amplitudes were applied to the specimens using a servohydraulic machine. An equivalent stress was used to correlate the fatigue lifetimes for the variable amplitude histories. Fatigue crack propagation tests were also performed at room temperature and for stress ratio R=0. The increase of particle size reduces the total fatigue lifetimes due to a reduction of the initiation life. Fatigue crack propagation rate increases with the increase of particle size. As the temperature and the stress ratio increase the fatigue strength decreases.
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