Critical fiber size for microcrack suppression in ceramic-fiber/ceramic-matrix composites

✍ Scribed by F. Delale

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 813 KB
• Volume: 31
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(88)90128-2

✦ Synopsis

In this paper the microcracking of ceramic-fiber/ceramic-matrix composites due to residual stresses is studied. Starting with the model of a single fiber embedded in an infinite matrix, the critical fiber size for suppression of interface and radial matrix cracking is determined. The relationship between critical fiber size and the parameters governing microcracking (such as cooling temperature, thermal expansion coefficients of fiber and matrix, Young's moduli of the constituents, etc.) is established. It is shown that a smaller difference between the thermal expansion coefficients of matrix and fiber feads to a larger critical fiber size.

Cooling temperature and the elastic properties of the constituents also affect microfracture.