| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Engineering Ceramics: Microstructure-Property-Performance Relations and Applications
|
| Presentation Title |
Mechanical Testing of Carbon Fiber-Reinforced Silicon Carbide Composites (C/C-SiC): Size effect of bending and tensile strength |
| Author(s) |
Stefan Flauder, Nico Langhof, Stefan Schafföner |
| On-Site Speaker (Planned) |
Stefan Schafföner |
| Abstract Scope |
Ceramic matrix composites (CMC) offer high thermo-mechanical resistance and low density, surpassing the brittleness of monolithic ceramics. A study on carbon fiber-reinforced silicon carbide composites (C/C-SiC) examines the strength dependency on sample size under different loading regimes. Various sample sizes and geometries underwent flexural and tensile tests. The C/C-SiC samples, fabricated by the liquid silicon infiltration (LSI) process with HT-fibers and a 0/90° plain weave fabric reinforcement, were evaluated for their statistical behaviour and sample size's impact on strength. The results show that the bending strength decreases with larger specimen size, but the Weibull modulus was load condition and volume dependent. The tensile strength of about 160 MPa also did not vary that much in the studied volume range. The probable size effect of strength in relation to statistical and quasi-brittle fracture mechanics was discussed. It is shown that the Weibull statistics couldn't adequately describe the strength's size effects. |