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Tensile strength degradation of ceramic fibres due to cyclic loading

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Abstract

Interfacial strength of Ti β 21S/SCS 6 composite was increased via ageing. Composite specimens with ao/W ratios of 0.24 and 0.07 were prefatigued in three point bending at ambient and at 500 °C both in the air and vacuum. Bridging fibres were extracted from the pre-fatigued specimens and tested in tensile loading to monitor the strength degradation due repeated opening and closing of the fatigue crack. A tri-modal Weibull distribution was employed to express strength distribution of the SCS 6 fibres. Results have shown that cyclic loading of the composites lower the mean tensile strength of the fibres by 20%, compared to the unfatigued composite. A marked effect of initial unbridged defect size was observed, when the tensile strength data were divided into two sub-population using the fatigue crack length values. Compared to unfatigued composite, tensile strength reductions of 41 and 22% were measured from the prefatigued composites with ao/W of 0.24 and 0.07, respectively.

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  1. Department of Metallurgical and Materials Engineering, Faculty of Engineering, Zonguldak Karaelmas University, Zonguldak, Turkey

    F. Kaya

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  1. F. Kaya
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Correspondence to F. Kaya.

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Kaya, F. Tensile strength degradation of ceramic fibres due to cyclic loading. J Mater Sci 42, 1096–1107 (2007). https://doi.org/10.1007/s10853-006-1369-9

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  • DOI: https://doi.org/10.1007/s10853-006-1369-9

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