Abstract

ABSTRACT Four point bending fatigue tests under haversine and pure sinusoidal loading is discussed from a theoretical point of view. In this discussion the material is considered to be visco-elastic rather than linear elastic. The differences between the two types of loading in force control are easily understood, but for deformation controlled tests the effect of different signals is less obvious. Tests that were performed to verify the theoretical considerations seem to indicate that the effect is different for different mixtures. The implication is that the results of fatigue tests under different loading signals cannot readily be compared.

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