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Influence of specimen geometry and surface quality on the bending strength of short fiber-reinforced C/SiC

Shi, Yuan and Koch, Dietmar and Hausherr, Jan and Neubrand, Achim (2015) Influence of specimen geometry and surface quality on the bending strength of short fiber-reinforced C/SiC. Trans Tech Publications, Switzerland. 20th Symposium on Composites, 01.-03. Juli 2015, Wien, Österreich. doi: 10.4028/www.scientific.net/MSF.825-826.

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Official URL: http://www.scientific.net/MSF.825-826.249


For continuous fiber-reinforced ceramic matrix composites, there is an extensive knowledge of the influence of specimen geometry on the failure mode and the determined strength in bending tests. In contrast, there are almost no studies on this topic for short-fiber-reinforced CMC, and as a consequence no testing standard for bending tests for such materials exists. In the present work, the influence of the specimen cross-section and the span width on the calculated mean and variance of the bending strength of different short fiber CMC (C/SiC with 3 mm and 10 mm fiber length) were examined. Below a certain specimen cross-section a decrease of the determined bending strength was observed. The relationships between the orientation of fiber bundles in the loaded area of the bending sample, the region of failure initiation and measured failure stress was investigated by high resolution X-ray CT in order to obtain further insight into the causes of strength scatter in these materials. The effect of different surface qualities prepared by grinding and milling on the measured bending strength in short fiber C/SiC was found to be negligible.

Item URL in elib:https://elib.dlr.de/97226/
Document Type:Conference or Workshop Item (Speech)
Title:Influence of specimen geometry and surface quality on the bending strength of short fiber-reinforced C/SiC
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Shi, Yuanyuan.shi (at) dlr.deUNSPECIFIED
Koch, Dietmardietmar.koch (at) dlr.deUNSPECIFIED
Hausherr, JanUniversität BayreuthUNSPECIFIED
Neubrand, AchimFraunhofer IWM, Freiburg, GermanyUNSPECIFIED
Date:July 2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.4028/www.scientific.net/MSF.825-826
Page Range:pp. 249-255
Publisher:Trans Tech Publications, Switzerland
Series Name:Materials Science Forum Vols. 825-826 (2015)
Keywords:Bending Strength, C/SiC, Mechanical Testing, Short-Fiber CMC, Standardization
Event Title:20th Symposium on Composites
Event Location:Wien, Österreich
Event Type:international Conference
Event Dates:01.-03. Juli 2015
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials (old)
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Ceramic Composite Structures
Deposited By: Shi, Dr.-Ing. Yuan
Deposited On:18 Nov 2015 14:45
Last Modified:18 Nov 2015 14:45

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