Fatigue Behavior of a Cross-Ply Ceramic Matrix Composite at Elevated Temperatures Under Tension-Tension Loading
Abstract
A study was conducted which investigated the behavior of a Nicalon/ Calcium-Aluminosilicate (Nicalon/CAS) cross-ply ((0/90)2S) ceramic matrix composite at elevated temperatures under tension-tension fatigue loading. Tension-tension fatigue tests were performed with a load ratio of R = 0.10 and a frequency of 10 Hertz at 700 deg C and 850 deg C. These results were compared to results from a previous study conducted at room temperature. Material behavior and damage was recorded by fatigue life curves, elastic modulus' maximum and minimum strain, acetate replication techniques, and post-mortem fractography. Analysis of these results showed identical matrix dominated damage behavior at RT and 700 deg C. Ultimate failure was caused by an accumulation of matrix damage, most of which occurred on the first cycle. However, at 8500C, significantly less damage occurred to the matrix and failure was fiber dominated. Fiber debonding was identified as the major damage mechanism responsible for final failure at this elevated temperature. Ceramic matrix composite, Tension-tension fatigue elevated temperature, Fiber debonding.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1993
- Accession Number
- ADA275466
Entities
People
- Richard J. Tuznik
Organizations
- Air Force Institute of Technology