Fracture Toughness of 2‐D Woven SiC/SiC CVI‐Composites with Multilayered Interphases

Droillard, Christine; Lamon, Jacques

doi:10.1111/j.1151-2916.1996.tb08516.x

Cited by 148 publications

(133 citation statements)

References 17 publications

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“…. For instance, high tensile strengths (up to 400 MPa) can be obtained with Hi-Nicalon TM SiC fibers [19], or with rather strong interfaces [17,20]. Larger strains-tofailure (up to 1%) can also be observed [20].…”

Section: Propertiesmentioning

confidence: 94%

Chemical Vapor Infiltrated SiC/SiC Composites (CVI SiC/SiC)

Lamon¹

2005

Handbook of Ceramic Composites

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CVI SiC/SiC composites are manufactured via Chemical Vapor Infiltration Process. The SiC-based matrices are deposited from gaseous reactants on to a heated substrate of SiC fiber preforms. An interphase coated on the fibers allows control of damage and mechanical behavior.The advantageous properties of CVI SiC/SiC composites such as their excellent high temperature strength, creep and corrosion resistances, low density, high toughness, resistance to shocks, fatigue and damage, and reliability make them ideal candidates for the replacement of metals and ceramics in many engineering applications involving loads, high temperatures and aggressive environments. Mechanical properties exhibit features that differentiate CVI SiC/SiC composites from monolithic ceramics and glasses, from other ceramic matrix composites and from other composites.

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Section: Propertiesmentioning

confidence: 94%

Chemical Vapor Infiltrated SiC/SiC Composites (CVI SiC/SiC)

Lamon¹

2005

Handbook of Ceramic Composites

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“…9,10) A 2D-Nicalon/SiC composites with multilayered PyC-SiC interlayers have been fabricated and studied. 10,11) Also, Hi-Nicalon TM /SiC minicomposites with nanoscale (PyC-SiC) n interlayers have been developed. 12) One of the main advantages of the multilayers in SiC/SiC composites is the possibility to provide much complex interfacial cracking mechanisms and thus, to improve the materials performance.…”

Section: Introductionmentioning

confidence: 99%

Hi-Nicalon<SUP>TM</SUP> Fiber-Reinforced CVI-SiC Matrix Composites: I Effects of PyC and PyC-SiC Multilayers on the Fracture Behaviors and Flexural Properties

Yang¹,

Araki²,

Noda³

et al. 2002

Mater. Trans.

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The flexural properties of 2D plain-woven Hi-Nicalon TM fiber reinforced SiC/SiC composites with various PyC and PyC-SiC multilayers were studied at ambient temperature. The composites were fabricated by chemical vapor infiltration process (CVI). The interlayers were deposited by isothermal CVI process from methane for PyC layer and CH 3 SiCl 3 (MTS) for SiC layer. The effects of the various interlayers on the fracture behaviors and flexural properties were investigated. The PyC layer thickness showed significant influence on the flexural strength and an optimum PyC layer thickness was defined to be ∼ 150 nm. Fiber/matrix interfacial debonding occurred at the very fiber surface for single PyC layered composites while several interfacial debonding and cracking behaviors were observed with the PyC-SiC multilayered composites.

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“…There are different methods for calculating the critical Jintegral value, J IC , (58,(87)(88). The majority of them are based on the calculation of the energy absorbed by pre-cracked specimens, determined on the basis of the area under the load -crack opening displacement curves (87).…”

Section: Determination Of Fracture Parametersmentioning

confidence: 99%

“…The majority of them are based on the calculation of the energy absorbed by pre-cracked specimens, determined on the basis of the area under the load -crack opening displacement curves (87). The J-integral values MEChANICAL BEhAVIOUR Of STRUCTURAL CERAMICS As Fig.…”

Section: Determination Of Fracture Parametersmentioning

confidence: 99%

Comportamiento mecánico de materiales cerámicos estructurales

Bueno¹,

Baudı́n²

2007

Bol. Soc. Esp. Ceram. Vidr.

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The use of ceramic materials in structural applications is limited by the lack of reliability associated with brittle fracture behaviour. In order to extend the structural use of ceramics, the design of microstructures which exhibit flaw tolerance due to toughening mechanisms which produce an increase in crack growth resistance during crack propagation has been proposed. This work is a review of the mechanical behaviour of structural ceramic materials and its characterisation. Firstly, the basic brittle fracture parameters and the statistical criteria to determine the probability of exceeding the safety factors demanded for a particular application are analysed. Then, the toughening mechanisms which can be developed in the materials through microstructural design as well as the mechanical characterisation of toughened ceramics are discussed. The experimental values of linear elastic fracture toughness parameters (critical stress intensity factor, K IC , and critical energy release rate, G IC ) are not intrinsic properties for toughened materials and depend on crack length and the loading system. In this work, the different mechanical parameters proposed to characterise such materials are reviewed. The following fracture parameters are analysed: work of fracture (γ WOF ), critical J-integral value (J IC ) and R-curve. For the determination, stable fracture tests are proposed in order to ensure that the energy provided during the test is no more than the necessary one for crack propagation.Keywords: Microstructure, Strength, Weibull modulus, Fracture toughness, Toughening mechanisms. Comportamiento mecánico de materiales cerámicos estructuralesEl uso de los materiales cerámicos en aplicaciones estructurales está limitado por la falta de fiabilidad asociada a su comportamiento frágil durante la fractura. Para extender su aplicación se ha propuesto el diseño de microestructuras que presenten tolerancia a los defectos debido a la actuación de mecanismos de refuerzo. Este trabajo es una puesta al día sobre el estudio del comportamiento mecánico de los materiales cerámicos estructurales y su caracterización. En primer lugar, se revisan los parámetros de fractura utilizados para caracterizar materiales frágiles y los criterios de control estadístico que permiten determinar la probabilidad de que se sobrepasen los factores de seguridad exigidos en cada aplicación. A continuación, se discuten los mecanismos de refuerzo que se pueden desarrollar en los materiales cerámicos a través del diseño microestructural. En los materiales cerámicos en los que la actuación de mecanismos de refuerzo conduce a un comportamiento significativamente distinto del puramente frágil, los parámetros derivados del tratamiento lineal elástico (factor crítico de intensidad de tensiones, K IC , y tasa crítica de liberación de energía, G IC ), determinados experimentalmente, dejan de ser propiedades intrínsecas del material, independientes del tamaño de grieta y el sistema de carga. El presente trabajo revisa los parámetros mecánicos propuestos para...

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Fracture Toughness of 2‐D Woven SiC/SiC CVI‐Composites with Multilayered Interphases

Cited by 148 publications

References 17 publications

Chemical Vapor Infiltrated SiC/SiC Composites (CVI SiC/SiC)

Chemical Vapor Infiltrated SiC/SiC Composites (CVI SiC/SiC)

Hi-Nicalon<SUP>TM</SUP> Fiber-Reinforced CVI-SiC Matrix Composites: I Effects of PyC and PyC-SiC Multilayers on the Fracture Behaviors and Flexural Properties

Comportamiento mecánico de materiales cerámicos estructurales

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