Session: 02-01 Mechanical Behavior of Ceramics and Composites

Paper Number: 123432

123432 - Development of High-Temperature, Interlaminar Tension (ILT) Test Methodology for Ceramic Matrix Composites (CMCs) 

The interlaminar properties of ceramic matrix composites (CMCs) are of the critical design parameters in CMC airfoils as gas-turbine hot-section components. However, due to architectural features and other related issues unique to CMC material systems, it has been daunting and challenging tasks to develop high-temperature interlaminar tension (ILT) testing for CMCs in both 2D woven and cross-plied architectures. This work demonstrates how the issues were explored and what efforts were made, leading to development of a diametral-compression test methodology to determine ILT property of CMCs at elevated temperatures. The test methodology was first delved and verified at ambient temperature employing different model materials such as one 2D woven polymer matrix composite (PMC) and two isotropic materials of soda-lime glass and PMMA (polymethyl methacrylate). The test method was then applied to and verified with two different gas-turbine grade CMCs including 2D woven N720/alumina oxide/oxide and 2D cross-plied MI SiC/SiC CMCs at high temperatures of 1000 to 1316 deg. C.  Life prediction testing was also carried out at 1316 deg. C in the MI SiC/SiC CMC to validate the effectiveness of test method for a long-term life prediction testing. The results of all those testing conducted in diametral compression indicated an applicability and feasibility of the high-temperature ILT test methods for strength and life prediction testing in CMC material systems, with provisions of all necessary aspects of affordability and simplicity and technical soundness as an appropriate test methodology.

Presenting Author: Sung Choi Naval Air Systems Command

Presenting Author Biography: - Science & Technology Lead, Fellow of NAVAIR
- Former Chair of Ceramics Committee of IGTI
- Fellow of ASME and American Ceramic Society

Authors:

Jacob Mattison Naval Air System Command
David Faucett Naval Air Systems Command
Sung Choi Naval Air Systems Command