Hybrid Ceramic Matrix Composites: A Study of Transverse Properties and Failure Modes.
Abstract
The purpose of this study was to demonstrate the effects, and ultimately, the advantages of forming a hybrid ceramic matrix composite (HCMC) by adding whiskers to a fiber reinforced ceramic matrix composite (FCMC). The addition of whiskers to a continuous fiber ceramic composite has been shown to produce a hybrid composite that: (1) is more stiffer, (2) resists microcracking until higher loading levels, (3) has improved transverse strength and stiffness and (4) shows improved damage tolerance when compared with fiber reinforced composites (FCMC). The modulus was found to be, on average, 212 + or - 24 GPa for the hybrid system compared to 170 + or - 20 GPa for the FCMC system. The ultimate strength was basically preserved, but the stress at which microcracking was first observed was increased for the hybrid system to 121.4 + or - 19.0, an increase almost threefold over the FCMC system. The transverse microcracking stress was 31.0 + or - 7.0 MPa for the HCMC compared with 16.4 + or - 1.0 MPa for the FCMC. The ultimate strengths were 62.4 + or - 7.0 MPa and 24.2 + or - 6.0 MPa, respectively. The study has indeed demonstrated the benefits from hybridization of ceramic composites and provide a basis for further study. (MM)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 31, 1995
- Accession Number
- ADA302118
Entities
People
- D. R. Carroll
- L. R. Dharani