Tension-compression fatigue behaviour of fibre-reinforced ceramic matrix composite with circular hole |
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| Affiliation: | 1. Department of Mechanical Engineering, MA College of Engineering, Kothamangalam, Kerala 686691, India;2. Department of Mechanical Engineering, Viswajyothi College of Engineering and Technology, Vazhakulam, Kerala 686670, India;1. Macdonald Engineering Building, Room 492, Department of Civil Engineering and Applied Mechanics, McGill University, 817 Sherbrooke Street West, Montreal H3A0C3, Canada;2. Macdonald Engineering Building, Room 362, Department of Mechanical Engineering, McGill University, 817 Sherbrooke Street West, Montreal H3A0C3, Canada |
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| Abstract: | The tension-compression fatigue behaviour of a silicon carbide fibre-reinforced glass ceramic matrix composite, SiC/1723, with a circular hole was investigated at room temperature. Two laminate lay-ups were studied: cross-ply, 0/90]2s, and unidirectional, 0]8. At first, the fatigue limit based on one million cycles was established for the tension-tension fatigue condition. Then, the fatigue response under fully reversed (tension-compression) cycling loading with a maximum stress equal to the tension-tension fatigue limit was investigated. This tension-compression loading resulted in an increased amount of damage and ultimately led to the specimen failure well before one million cycles. In the cross-ply laminate, the damage mechanisms in the 90° plies involved transverse cracks only during tension-tension cycling, and transverse and longitudinal cracks during tension-compression cycling. In the unidirectional laminate, the longitudinal cracks which initiated at the hole periphery grew longer in tension-compression fatigue than in tension-tension fatigue. On the other hand, no damage and consequently no effect on fatigue life was observed during the compression-compression fatigue condition only. |
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