The fracture energy of metal fibre reinforced ceramic composites (MFCs)

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• 作者：S.R. Pemberton^a ; E.K. Oberg^a ; J. Dean^a ; D. Tsarouchas^b ; A.E. Markaki^b ; L. Marston^c ; T.W. Clyne^a ; ^{twc10@cam.ac.uk}
• 关键词：A. Ceramic– ; matrix composites (CMCs) ; A. Short-fibre composites ; B. Fracture toughness ; B. Fibre/matrix bond ; C. Modelling
• 刊名：Composites Science and Technology
• 出版年：2011
• 出版时间：7 February 2011
• 年：2011
• 卷：71
• 期：3
• 页码：266-275
• 全文大小：1867 K

文摘

A model is presented for prediction of the fracture energy of ceramic–matrix composites containing dispersed metallic fibres. It is assumed that the work of fracture comes entirely from pull-out and/or plastic deformation of fibres bridging the crack plane. Comparisons are presented between these predictions and experimental measurements made on a commercially-available composite material of this type, containing stainless steel (304) fibres in a matrix predominantly comprising alumina and alumino-silicate phases. Good agreement is observed, and it’s noted that there is scope for the fracture energy levels to be high (20 kJ m⁻²). Higher toughness levels are both predicted and observed for coarser fibres, up to a practical limit for the fibre diameter of the order of 0.5 mm. Other deductions are also made concerning strategies for optimisation of the toughness of this type of material.