Development of Capability for Characterization of Ceramic/Ceramic Composites. Part 2. (High Temperature Characterization of SiCw/SiC Composites and Prediction of Flexural Properties by Energy Method)
Abstract
The fracture and flexural behavior of monolithic SiC and SiC-whisker reinforced SiC composites (SiCw/SiC) have been investigated at room and elevated temperatures. Flexure and fracture tests were conducted in a four-point beam configuration at 230C, 800 deg C and 1200 deg C to study the effects of whisker reinforcements especially in respect of mechanical and thermal stability at high energy environments. Flexural strengths and fracture toughness data within the test temperature range are presented in graphical as well as in weibull form, and experimental observations are analyzed and discussed. Attempts have been made to predict the flexural properties of the composite by coupling the principle of minimization of potential energy and the rule of mixture. The deflection curve of a composite four-point beam coupon is found from an assumed Fourier series solution satisfying the geometric boundary conditions and using the rule of mixture. Strain compatibility conditions are applied to determine the axial displacement field and hence the flexural strain. Stresses on the matrix and fiber are then estimated under the assumption of isostrain conditions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1991
- Accession Number
- ADA251133
Entities
People
- A. Haque
- Hassan Mahfuz
- Shaik Jeelani
- Sirajus Salekeen
Organizations
- Tuskegee University