Investigation of Tension-Compression Fatigue Behavior of a Unidirectional MetalMatrix Composite at Elevated Temperature

摘要

This study investigated the fatigue behavior in a unidirectional metal matrixcomposite under tension-compression loading conditions. Stress-strain responses, modulus and strain trends were monitored to characterize damage. Fractography and microscopy were used to characterize failure modes. Fatigue life curves were plotted base on different parameters such as stress and strain. Tension-compression fatigue life was shorter than the obtained under tension-tension fatigue cycling. Creep, observed in tension-tension. fatigue cycling, and the effects of the compressive load on the plastic zone around the crack tip explain shorter life under tension-compression fatigue loading.