Modelling the effect of oxidation on the creep behaviour of fibre-reinforced ceramic matrix composites

Casás, Lidia M.; Martı́nez-Esnaola, J.M.

doi:10.1016/s1359-6454(03)00189-7

Cited by 104 publications

(41 citation statements)

References 27 publications

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“…In order to study the effect of oxidation on CMCs, it is important to account for the pre form geometry, distribution of porosity and crack density and have sufficient information on the in-situ properties of constituents [1][2]. In other words, a successful approach needs to either represent or attempt to simplify the following: 1) a repeat unit cell that represents the geometry of the fabric, fiber interface coating and matrix distribution, 2) knowledge of in-situ mechanical properties of constituents, 3) distribution of manufacturing porosity and their effect on mechanical properties, and 4) crack density as a function in pre form geometry and the stress within a unit cell.…”

Section: Micromechanics Modelmentioning

confidence: 99%

“…However, before this goal can be achieved, a few issues related to their performance have to be addressed [1][2][3]. Among these issues is the effect of oxidation of their constituents, under conditions of high temperature in an environment that contains oxygen and/or water vapour in an effort to prolong their ability to withstand such environment and enhance their mechanical reliability.…”

Section: Introductionmentioning

confidence: 99%

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An Overview of Ceramic Matrix Composites

2017

IJAERD

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Section: Micromechanics Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Overview of Ceramic Matrix Composites

2017

IJAERD

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“…(23) indicates that there exists an incubation period equal to the time required to grow an oxide layer as thick as the size of the average critical flaw in the virgin fibers. Also note that afterwards, the characteristic fiber strength changes with time as≈t −1/4 .…”

Section: Oxidation Effectsmentioning

confidence: 99%

“…The effects of matrix cracking, ingress of the environment to the interion of the composite, oxidation of the fiber coating and oxidation of the fibers have been consider in the developed model. Casas et al [11] developed a creep−oxidation model for fiber−reinforced CMCs at elevated temperature, including the effects of interface and matrix oxidation, creep of the fibers and the degradation of fiber strength with time. The broken fibers fraction increases with time in an accelerated manner due to fiber strength degradation.…”

mentioning

confidence: 99%

Modeling the Effect of Oxidation on Tensile Strength of Carbon Fiber−Reinforced Ceramic−Matrix Composites

2015

Appl Compos Mater

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An analytical method has been developed to investigate the effect of oxidation on the tensile strength of carbon fiber−reinforced ceramic−matrix composites (CMCs). The Budiansky−Hutchinson−Evans shear−lag model was used to describe the micro stress field of the damaged composite considering fibers failure. The statistical matrix multicracking model and fracture mechanics interface debonding criterion were used to determine the matrix crack spacing and interface debonded length. The fiber strength degradation model and oxidation region propagation model have been adopted to analyze the oxidation effect on tensile strength of the composite, which is controlled by diffusion of oxygen gas through matrix cracks. Under tensile loading, the fibers failure probabilities were determined by combining oxidation model and fiber statistical failure model based on the assumption that fiber strength is subjected to two-parameter Weibull distribution and the loads carried by broken and intact fibers statisfy the global load sharing criterion. The composite can no longer support the applied load when the total loads supported by broken and intact fibers approach its maximum value. The conditions of a single matrix crack and matrix multicrackings for tensile strength considering oxidation time and temperature have been analyzed.

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“…The effect of oxidation on the creep behavior has also been estimated through the introduction of a delay factor in the evolution of the quantity of consumed interphase [7]. All these models have been developed for less complex matrix architectures and/or for a dry atmosphere, since they do not consider the volatilization of the oxide (except [3]).…”

Section: Introductionmentioning

confidence: 99%

Modeling of Simultaneous Oxidation and Volatilization Phenomena Along a Crack in a Self-Healing Multi-constituent Material

et al. 2017

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Abstract. Multi-layer Ceramic Matrix Composites with self-healing capacities have been developed for hightemperature aeronautical applications. However, the use of these sophisticated materials lead to complex thermochemical behavior which requires a proper analysis. Previous models have allowed to determine the quantity of oxygen reaching the fiber at the end of a crack, in a dry atmosphere. The focus of this study was to extend this model to the case of humid atmospheres, for the presence of moisture can lead to the volatilization of the healing oxide. Applications of the model have been performed on a material composed of successive layers of SiC and B 4 C. Changes of the crack wall surface could then be evaluated, as well as the healing or recession behavior, and the evolution of the oxygen concentration. Moreover, the introduction of a uniform equivalent averaged material allowed estimations of the consumption of all constituents, and in particular of carbon interphase, over durations representative of aeronautical service lives.

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Modelling the effect of oxidation on the creep behaviour of fibre-reinforced ceramic matrix composites

Cited by 104 publications

References 27 publications

An Overview of Ceramic Matrix Composites

An Overview of Ceramic Matrix Composites

Modeling the Effect of Oxidation on Tensile Strength of Carbon Fiber−Reinforced Ceramic−Matrix Composites

Modeling of Simultaneous Oxidation and Volatilization Phenomena Along a Crack in a Self-Healing Multi-constituent Material

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