Microstructural and mechanical properties of filler-added coal-tar pitch-based C/C composites: the damage and fracture process in correlation with AE waveform parameters

Siron, Olivier; Chollon, Georges; Tsuda, Hiroshi; Yamauchi, H; Maeda, Kei; Kosaka, Katsuaki

doi:10.1016/s0008-6223(99)00270-5

Cited by 42 publications

(29 citation statements)

References 15 publications

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“…As shown, the macroscopic linear elastic behavior of the load versus displacement is accompanied by exponential-type profile of the cumulative AE counts irrespective of the density degree. This type of AE features accumulation was also reported by Siron et al [14] on unidirectional C/C composites for the 90°off-axis tensile tests, as well as by Gareth et al [13] in polygranular graphite IMI-24 (spherical particles with coal-tar pitch binder) subjected to compressive load. As mentioned, the three stages of the damage progress are well reflected in the AE curve.…”

Section: Discussionsupporting

confidence: 83%

“…This AE finding indicates an existing threshold below which no damage is initiated. Siron et al [14] found also that AE events were detected above a critical strain for unidirectional C/C composites.…”

Section: Flexural and Acoustic Propertiesmentioning

confidence: 95%

“…Following the AE events analysis suggested by Siron et al [14] for C/C composite, Fig. 12 depicts an illustration of test time, amplitude and duration of the events recorded during loading up to fracture of high porosity uniform bend specimen.…”

Section: Fracture Resistance and Acoustic Propertiesmentioning

confidence: 99%

“…The high range is related to a sharp increase in the duration time (1000-4500 ls) up to the final fracture. Based on the fracture surface study and in corresponding to Siron et al [14] one can assume that three basic failure modes control the fracture of such composite as related to the mentioned order ranges of amplitude and duration: micro-cracking of the multilayered matrix, fiber failure (bundle failure) and initiation and propagation of macrocracks.…”

Section: Fracture Resistance and Acoustic Propertiesmentioning

confidence: 99%

“…This phenomenon was attributed to recovery processes (basal plane shear and microcracking) that occur upon unloading and at zero stress. Recently, Siron et al [14] characterized the damage and fracture process in correlation with AE waveform parameters of filleradded coal-tar pitch-based C/C composites, under quasi static loading. They concluded that the initiation and propagation of interfiber micro-cracks are ascribed to the low duration and low/medium amplitude events while delamination cracks were associated to medium duration and amplitude and high duration and amplitude related to macrocrack initiation and propagation.…”

Section: Introductionmentioning

confidence: 99%

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Fracture characterization of C/C composites under various stress modes by monitoring both mechanical and acoustic responses

Bussiba¹,

Kupiec²,

Piat

et al. 2008

Carbon

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IntroductionCarbon/carbon (C/C) composites recognized also as carbon fiber reinforced carbon are characterized by their higher specific strength and stiffness of up to 3000°C in non-oxidizing atmospheres, as compared to other ceramic matrix composites. In addition, the low coefficient of thermal expansion, high thermal conductivity and high thermal shock resistance, have made this material an excellent candidate for aerospace and defence applications for more than three decades. The most popular applications that this unique composite is being used for are: brake discs, rocket nozzles, leading edges of re-entry vehicles, furnace heating, and thermal management components in space vehicles [1].The severe environmental conditions (mechanical and thermal) which critical engineering structures such as those made of C/C composites have to face, require special attention from manufacturing processes to improve their service in performance [2] aspects. As well-known, defects and flaws may be initiated and may grow as a result of the above conditions and this can upset the mechanical balance of fiber, matrix and interface that gives composites their high performance profile. For the first, the determination of the optimal parametric process, quality control using destructive and non-destructive techniques and mutual properties becomes important. For the second, damage degree development, degradation in performance residual strength, etc., have to be assessed from the structural integrity and life prediction points of view. EVA-STAR (Elektronisches Volltextarchiv -Scientific Articles Repository)

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Section: Discussionsupporting

confidence: 83%

Section: Flexural and Acoustic Propertiesmentioning

confidence: 95%

Section: Fracture Resistance and Acoustic Propertiesmentioning

confidence: 99%

Section: Fracture Resistance and Acoustic Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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