Toughness assessment of ceramic matrix composites

Bouquet, Michel; Birbis, J.M.; Quenisset, J.M.

doi:10.1016/0266-3538(90)90102-b

Cited by 41 publications

(13 citation statements)

References 3 publications

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“…The principal conclusions were (i) high tensile strength and modulus but poor shear properties, [3][4][5][6][7] (ii) high fracture toughness and notch insensitivity, 3,8 -11 and (iii) R-curve behavior. [11][12][13][14] These fracture characteristics are similar to those of continuous-fiber-reinforced ceramic composites (CFCCs), for example, SiC/SiC or C/SiC. The fracture resistance and notch insensitivity of the CFCCs have been shown to result from the stress redistribution that is generated by nonlinear tensile stressstrain (-⑀) behavior.…”

Section: Introductionmentioning

confidence: 90%

Effect of Shear Damage on the Fracture Behavior of Carbon–Carbon Composites

Goto

Hatta

Takahashi

et al. 2001

Journal of the American Ceramic Society

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The notch insensitivity of carbon-carbon composites (C/Cs) has been believed to result primarily from shear damage near sources of stress concentration. To evaluate this hypothesis, notch sensitivity has been examined for C/Cs with crossply laminates (CP-C/Cs) and quasi-isotropic (QI-C/Cs) laminates. The main difference in both laminates involves their shear behavior: the QI-C/Cs have an almost-linear stress-strain curve and high strength, whereas the CP-C/Cs exhibit strong nonlinearity and low strength. Thus, the effect of shear damage can be extracted by comparison of both materials. Experimental results from the present study have shown that the fracture behaviors of both C/Cs are quite similar. Finiteelement analyses also have revealed that the stress redistribution caused by shear nonlinear deformation is too small to explain its toughening behavior, even in the CP-C/C. From these results, it is concluded that the notch-insensitive behavior of the C/Cs cannot be explained by the already-proposed shear-damage mechanism. To this end, a discussion has been conducted on a new possible toughening mechanism that is capable of generating the R-curve and notch insensitivity.

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Section: Introductionmentioning

confidence: 90%

Effect of Shear Damage on the Fracture Behavior of Carbon–Carbon Composites

Goto

Hatta

Takahashi

et al. 2001

Journal of the American Ceramic Society

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“…Of major interest in the research and application studies of AE in composite systems has been the ability to track damage progression in real time. Issues such as monitoring damage initiation and accumulation through AE have been extensively studied in a variety of composite materials including polymer matrix composites [1,2], metal matrix composites [3,4], and ceramic matrix composites [5,6]. The results, which are based primarily on AE count rates and accumulation of AE events, demonstrated that this major goal in the application of the AE technique to a variety of composite materials has been met very successfully.…”

Section: Introductionmentioning

confidence: 93%

Acoustic Emission Characterization of a Glass-Matrix Composite

Chen

Karandikar

Takeda

et al. 1992

Nondestructive Testing and Evaluation

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Acoustic emission (AE) analyses have been performed on a high compliance, high failure strain randomly oriented carbon reinforced glass matrix composite. The composite exhibits a unique nonlinear stress-strain behavior with high failure strain during both uniaxial tensile and flexural testing. The extensive matrix cracking of this material during loading provides an excellent opportunity to study the fracture mechanism..In this study, two types of composites using similar constituents but different processing procedures resulting in different mechanical behavior, were studied. One composite showed a very pronounced non-linear stress-strain behavior during tensile testing. The curve consists of an initial linear portion, followed by a deviation from linearity and a large amount of longitudinal strain is produced with very little increase in the stress. The second composite did not show similar behavior with the slope of the stress-strain decreases continuously. The apparent different mechanical behavior of the two composites provided an excellent opportunity to use the AE characterization to distinguish two different fracture processes.This study concentrates on monitoring damage initiation and damage progression during tensile and flexural testing using acoustic emission sensors. Detailed examination of AE characterization, including cumulative AE events, event occurrence and its rate as a function of load, and amplitude distribution histograms of events at different load levels, reveals a different emission activities during tensile and flexural loading conditions, indicating different fracture patterns. The examination of amplitude distributions at various loads revealed that the method is sensitive enough to distinguish various fracture processes.

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“…3 can be associated to friction phenomena between microcrack faces and the presence of fragments between the main crack faces. Therefore the sample compliance is better estimated with respect to the 0-displacement 0-load point (Bouquet et al 1990;Lawn and Marshall 1998).…”

Section: Methodsmentioning

confidence: 99%

“…Even if there is have important residual deflections for the cycling test ( Fig. 3), it may be the consequence of the presence of debris between crack faces which are not relevant for any stiffness considerations Bouquet et al (1990). Using the crack length estimation (Eq.…”

Section: Elastic Compliance Methodsmentioning

confidence: 99%

Identification of damage and cracking behaviours based on energy dissipation mode analysis in a quasi-brittle material using digital image correlation

et al. 2011

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Characterizing the crack stability to predict the behaviour of ceramics designed for industrial use is a challenging issue. It requires accurate crack tip detection during the controlled crack propagation of notched bending tests. Different indirect methods are available, like for instance the compliance technique. Recently, techniques based on digital image correlation (DIC) have emerged: finite-element DIC (FE-DIC) with a finite element decomposition of the displacement field, integrated-DIC (I-DIC) based on Williams' series decomposition of the displacement field and regularized-DIC (R-DIC) for mechanical constraints. These full-field techniques enable the quantification of the crack length and the stress intensity factor K I . In this paper, these four methods are compared in terms of measurements of crack lengths and stress intensity factors during a notched bending test. The tested material is a damageable quasi-brittle ceramic at room temperature. The non linearity of the stress-strain law of this microcraked ceramic results in a complex behaviour that is not captured by the compliance method during the bending test. Therefore the linear elastic compliance method leads to a different estimation of crack lengths and stress intensity factors compared to DIC methods. On the other hand, the R-DIC approach handles the non linear material constitutive behaviour. It allows a deeper analysis of the mechanical fields, the energy dissipation and the damage mechanisms during the crack propagation.

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Toughness assessment of ceramic matrix composites

Cited by 41 publications

References 3 publications

Effect of Shear Damage on the Fracture Behavior of Carbon–Carbon Composites

Effect of Shear Damage on the Fracture Behavior of Carbon–Carbon Composites

Acoustic Emission Characterization of a Glass-Matrix Composite

Identification of damage and cracking behaviours based on energy dissipation mode analysis in a quasi-brittle material using digital image correlation

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