Tension-compression fatigue behaviour of fibre-reinforced ceramic matrix composite with circular hole

S. Mall, W.A. Weidenaar
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引用次数: 9

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.

圆孔纤维增强陶瓷基复合材料的拉压疲劳性能
研究了带有圆孔的碳化硅纤维增强玻璃基复合材料SiC/1723的室温拉压疲劳性能。研究了两种层压板铺层:交叉铺层,[0/90]2s和单向铺层,[0]8。首先,建立了基于一百万次循环的拉伸-拉伸疲劳极限;然后,研究了在最大应力等于拉-拉疲劳极限的完全反向(拉-压)循环加载下的疲劳响应。这种拉压载荷导致损伤量增加,最终导致试样在100万次循环之前失效。在交叉层合板中,90°层合板的损伤机制仅涉及拉伸-拉伸循环过程中的横向裂纹,以及拉伸-压缩循环过程中的横向和纵向裂纹。在单向层合材料中,从孔周开始的纵向裂纹在拉-压疲劳中比在拉-拉疲劳中延长。另一方面,仅在压缩-压缩疲劳状态下,没有观察到损伤,因此对疲劳寿命没有影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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