Topic
Ceramic matrix composite
About: Ceramic matrix composite is a research topic. Over the lifetime, 7807 publications have been published within this topic receiving 117020 citations.
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TL;DR: In this paper, the quasi-static tensile behavior of unidirectional, (0/90)s, (02/904)s and (0 /90)3s silicon carbide fiber (Nicalon) reinforced calcium aluminosilicate glass-ceramic matrix laminates is investigated.
Abstract: Experimental results are presented for the quasi-static tensile behaviour of unidirectional, (0/90)s, (02/904)s and (0/90)3s silicon carbide fibre (Nicalon) reinforced calcium aluminosilicate glass-ceramic matrix laminates. The stress-strain behaviour and associated damage development is described in detail for each laminate. The damage development is quantified by counts of crack density (in both the longitudinal and transverse plies) and stiffness reduction as functions of applied strain. The damage initiation and growth (and its effect on residual properties) are discussed with reference to the Aveston-Cooper-Kelly (ACK) theory for unidirectional ply cracking and crossply laminate shear-lag (originally developed for polymer matrix composites) to describe the transverse ply cracking behaviour.
115 citations
TL;DR: In this paper, the tensile properties of a 0/90 laminated CAS matrix composite reinforced with Nicalon fibers have been measured and compared with available models, and the ultimate tensile strength has also been compared with a global load sharing model.
Abstract: The tensile properties of a 0/90 laminated CAS matrix composite reinforced with Nicalon fibers have been measured. Some effects of notches have also been explored. Changes in modulus and permanent strain caused by matrix cracking have been measured and compared with available models. For this comparison, independent measurements have been made of the constituent properties and the residual stress. The ultimate tensile strength has also been measured and compared with a global load-sharing model. It is concluded that lower-bound matrix cracking models provide good predictability of the stresses at which various matrix cracking mechanisms first operate. Also, the ultimate tensile strength is found to be consistent with a global load-sharing model, based on the in situ strength properties of the fibers. Conversely, the evolution of matrix cracks at stresses above the lower bound has yet to be adequately modeled. In addition, a need is identified for improved models relating elastic properties and permanent strains to matrix crack spacing.
115 citations
TL;DR: In this article, carbon nanotubes were employed to reinforce the interfaces between polymer particles, enhancing composite stiffness as well as structural damping, and the results showed that CNT-reinforced samples have advanced impact strength and vibration damping properties over a wide temperature range.
Abstract: The focus in this paper is directed toward to thermal spraying fabrication and experimental validation of carbon nanotube-reinforced composite structures, providing processing route and design concepts. Sandwiched metal–polymer–ceramics coatings and moulded UHMW-PE polymer composites with carbon nanotubes were investigated at flexural tests and thermal cycling between +200 °C and −80 °C temperature. Carbon nanotubes were employed to reinforce the interfaces between polymer particles, enhancing composite stiffness as well as structural damping. Results on damping behavior and impact toughness of the composite sandwiches showed that CNT-reinforced samples have advanced impact strength and vibration damping properties over a wide temperature range. Experiments conducted using a vibrating clamped beam with the composite layers indicated up to 200% increase in the inherent damping level and 30% increase in the stiffness with some decrease (20–30%) in density of the composite. The cross-links between nanotubes and composite layers also served to improve load transfer within the network resulting in improved stiffness properties. The results are targeted for the application in aerospace and naval engineering.
114 citations
01 Mar 1989-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: The machinability and the physical properties of the composites are related to the content and the characteristics of the conductive silicon nitride and/or TiN particles as discussed by the authors.
Abstract: The recent improvements in mechanical properties of ceramics have led to the development of high-strength and high-toughness ceramic composites the machining of which, using conventional techniques, is a rather complicated and expensive routine especially when complex parts are manufactured. Electrical discharge machining is an attractive alternative machining technique but it requires electrically conductive ceramic materials. New conductive silicon nitride- and alumina-based composites with good mechanical properties were developed for this purpose by adding amounts of TiC and/or TiN particles to the ceramic matrix. The machinability and the physical properties of the composites are related to the content and the characteristics of the conductive TiC and/or TiN particles. The compositions can be adjusted to find the best compromise between high strength and electrical discharge machinability.
113 citations
TL;DR: The use of traditional machining methods was reviewed in Part I of this paper as discussed by the authors, where new methods are considered: laser, waterjet, electro-discharge, electrochemical spark, and ultrasonic machining.
113 citations