Querschnittseinfluss beim Zugversuch von siliziertem kohlenstoffkurzfaserverstärktem Kohlenstoff (C/C‐SiC)

Henrich, M.; Regener, D.; Weiß, Roland

doi:10.1002/mawe.200300659

Cited by 7 publications

(2 citation statements)

References 10 publications

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“…If large enough specimens are tested in four pointbending, the determined bending strength of short fiber CMC can thus be regarded as a geometry independent material property. This is in contrast to tensile tests of short fiber CMC where the tensile strength increased with cross section and did not reach an asymptotic value even for specimens of 200 mm² cross section [5].…”

Section: Four Point Bending Testscontrasting

confidence: 90%

Influence of Specimen Geometry and Surface Quality on the Bending Strength of Short Fiber-Reinforced C/SiC

Koch

Hausherr

Neubrand

2015

MSF

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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.

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Section: Four Point Bending Testscontrasting

confidence: 90%

Influence of Specimen Geometry and Surface Quality on the Bending Strength of Short Fiber-Reinforced C/SiC

Koch

Hausherr

Neubrand

2015

MSF

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“…Henrichs et al presented tensile testing of short fibre reinforced C/C-SiC, measuring a tensile strength of 12 MPa with a standard deviation of 4 MPa. [6]. Flexural testing of similar material from Weiss et al show a flexural strength of 50 MPa with a standard deviation of 15 MPa [7].…”

Section: Introductionmentioning

confidence: 97%

Determination of material properties for short fibre reinforced C/C-SiC

Hausherr

Eitel

Krenkel

2015

MATEC Web of Conferences

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Abstract. Determining the mechanical properties of short fibre reinforced CMC using standard sized coupons has always been a challenge due to a high statistical scattering of the measured values. Although the random orientation of short fibres results in a quasi-isotropic material behavior of 2D-structures with a sufficiently large volume, the small volume typical for test coupons usually results in a non-isotropic fibre orientation in the tested volume. This paper describes a method for manufacturing unidirectional oriented short fibre reinforced CMC materials and presents material properties of UD-C/C-SiC. After verifying the fibre orientation of the CMC using micro-computed tomography, coupons were extracted to determine the orthotropic material properties. These orthotropic material properties were then used to predict the properties of C/C-SiC with randomly distributed short fibres. To validate the method, micro-computed tomography is used to quantitatively determine the fibre orientation within coupons extracted from randomly distributed short fibre C/C-SiC. After mechanical three-point-bending tests, the measured stiffness and bending strength is compared with the predicted properties. Finally, the data are used to devise a method suited for reducing the inherent large spread of material properties associated with the measurement of CMC materials with randomly distributed short fibres.

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C/SiC and C/C‐SiC Composites

Heidenreich

2014

Ceramic Matrix Composites

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Querschnittseinfluss beim Zugversuch von siliziertem kohlenstoffkurzfaserverstärktem Kohlenstoff (C/C‐SiC)

Cited by 7 publications

References 10 publications

Influence of Specimen Geometry and Surface Quality on the Bending Strength of Short Fiber-Reinforced C/SiC

Influence of Specimen Geometry and Surface Quality on the Bending Strength of Short Fiber-Reinforced C/SiC

Determination of material properties for short fibre reinforced C/C-SiC

C/SiC and C/C‐SiC Composites

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