Anisotropic damage behavior of SiC/SiC composite tubes: Multiaxial testing and damage characterization

Bernachy‐Barbe, Fabien; Gélebart, Lionel; Bornert, Michel; Crépin, Jérôme; Sauder, Cédric

doi:10.1016/j.compositesa.2015.04.022

Cited by 49 publications

(57 citation statements)

References 18 publications

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“…Together, the hermeticity and fracture response of the CMCs illuminated in these bending experiments (Figure ) fits well within previously described failure behavior as governed by CMC architecture . This behavior appears to fit into four stages.…”

Section: Discussionsupporting

confidence: 87%

Unveiling hermetic failure of ceramic tubes by digital image correlation and acoustic emission

et al. 2019

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A new, in situ hermeticity testing apparatus has been developed to allow helium leak evaluation of ceramic tubes, including nuclear‐grade SiC/SiC fuel cladding ceramic matrix composites (CMC), during four‐point bending with simultaneous monitoring of local deformation and damage, using stereoscopic digital image correlation (DIC) and acoustic emissions. The capabilities of the experimental apparatus are demonstrated using alumina, borosilicate glass, and 4130 steel tubes with representative cladding dimensions and then applied to study the deformation‐hermeticity relationship of SiC/SiC CMCs. Results of three CMCs appear to indicate that matrix cracking occurs near the deviation from linearity strain at strains ranging from 0.04% to 0.06% and is shortly followed by an initial loss of gas tightness by 0.09% bending strain. Leaking increased in distinct steps over 0.1%‐0.2% bending strain, and within this range, results indicate that prior to fiber fracture, it is likely possible to regain gas tightness upon unloading. This technique and uncovered hermetic failure behavior are intended to progress the standardization of a test methodology for nuclear reactor components and to begin to resolve the mechanisms controlling distinct steps of ceramic matrix composite failure.

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Section: Discussionsupporting

confidence: 87%

Unveiling hermetic failure of ceramic tubes by digital image correlation and acoustic emission

et al. 2019

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“…Other nondestructive methods, such as acoustic emission (AE) and electrical resistance have been utilized to study the types of damage that occur in CMCs under various types of loading and environmental conditions . The use of X‐ray computed microtomography to observe damage in various types of CMCs has proven to be a valuable nondestructive techniques …”

Section: Introductionmentioning

confidence: 99%

Damage evolution in SiC/SiC unidirectional composites by X‐ray tomography

2020

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Melt infiltrated SiC/SiC ceramic matrix composite unidirectional (UD) composite specimens were imaged under load using X‐ray microtomography techniques in order to visualize the evolution of damage accumulation and to quantify damage mechanisms within the composite such as matrix cracking and fiber breaking. The data obtained from these in situ tensile tests were used in comparison with current models and literature results. Three‐dimensional (3D) tomography images were used to measure the location and spacing of matrix cracking that occurred at increasing stress increments during testing within two UD composite specimens. The number of broken fibers and the location of each fiber break gap that occurred within the volume of both specimens were also quantified. The 3D locations of fiber breaks were correlated with the location of each matrix crack within the volume of the specimen and it was found that at the stress scanned directly before failure, most of the fiber breaks occur within 100 microns of a matrix crack.

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“…The reported results showed a significant effect of biasing on the elastic modulus and strength properties of the material. Bernachy‐Barbe et al conducted several mechanical tests and reported modulus, tensile, compressive and shear strength data for CVI SiC‐SiC test specimens. Despite these studies, the database for this material is still far from being comprehensive.…”

Section: Introductionmentioning

confidence: 99%

Interlaboratory round robin study on axial tensile properties of SiC‐SiC CMC tubular test specimens

Singh

Gonczy²,

Deck

et al. 2018

Int J Applied Ceramic Tech

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An interlaboratory round robin study was conducted on the tensile strength of SiC‐SiC ceramic matrix composite (CMC) tubular test specimens at room temperature with the objective of expanding the database of mechanical properties of nuclear grade SiC‐SiC and establishing the precision and bias statement for standard test method ASTM C1773. The mechanical properties statistics from the round robin study and the precision statistics and precision statement are presented herein. The data show reasonable consistency across the laboratories, indicating that the current C1773‐13 ASTM standard is adequate for testing ceramic fiber reinforced ceramic matrix composite tubular test specimen. It was found that the distribution of ultimate tensile strength data was best described with a two‐parameter Weibull distribution, while a lognormal distribution provided a good description of the distribution of proportional limit stress data.

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Anisotropic damage behavior of SiC/SiC composite tubes: Multiaxial testing and damage characterization

Cited by 49 publications

References 18 publications

Unveiling hermetic failure of ceramic tubes by digital image correlation and acoustic emission

Unveiling hermetic failure of ceramic tubes by digital image correlation and acoustic emission

Damage evolution in SiC/SiC unidirectional composites by X‐ray tomography

Interlaboratory round robin study on axial tensile properties of SiC‐SiC CMC tubular test specimens

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