This work studies the fatigue behaviour of polyamides 6 and 66 reinforced with different degrees of short fibre glass (25 and 35 % by weight). For this purpose an analysis is made on both the influence of waveform type and waiting time on the fatigue behaviour of standardized tensile samples. For the first, a comparison is made between the behaviours obtained from both sinusoidal and square waveforms. For the second, fatigue tests have been performed by secuential blocks of fatigue separated by waiting times. A parallel reference study has been developed on the fatigue behaviour of an acetal resin which is considered to be a functional alternative to using reinforced polyamides in railway fastenings systems.
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