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Size effect of carbon fiber-reinforced silicon carbide composites (C/C-SiC) : Part 1 – bending load and statistical effects

Title data

Flauder, Stefan ; Langhof, Nico ; Krenkel, Walter ; Schafföner, Stefan:
Size effect of carbon fiber-reinforced silicon carbide composites (C/C-SiC) : Part 1 – bending load and statistical effects.
In: Journal of the European Ceramic Society. Vol. 41 (2021) Issue 14 . - pp. 6805-6814.
ISSN 0955-2219
DOI: https://doi.org/10.1016/j.jeurceramsoc.2021.07.040

Abstract in another language

This study analyzed the influence of the sample volume, number of tested specimen, and testing method on the
flexural strength of fabric-reinforced ceramic matrix composites. For this purpose, seven different batches of C/CSiC
were prepared with four different sample thicknesses to determine the flexural strengths and Weibull moduli
by three- and four-point flexural tests. The result showed that C/C-SiC exhibits a size effect of strength under
bending load because a decrease of measured flexural strength with increased specimen size was observed. This
size effect was discussed regarding the Weibull weakest link approach and the concept of quasi-brittle materials.
The determined Weibull moduli were comparable for the same load condition but dissimilar for the identical
material if the load condition were changed from three- to four-point bending. Hence, the Weibull modulus was
found to be not an inherent material constant for C/C-SiC and the Weibull weakest link approach seems not
appropriate.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Ceramic matrix composites (CMC); Bending test; Weibull statistics; C/C-SiC; Size effect of strength
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Ceramic Materials
Faculties > Faculty of Engineering Science > Chair Ceramic Materials > Chair Ceramic Materials - Univ.-Prof. Dr.-Ing. Stefan Schafföner
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 500 Natural sciences
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 29 Nov 2021 08:30
Last Modified: 29 Nov 2021 08:30
URI: https://eref.uni-bayreuth.de/id/eprint/68017