SEDL / STP / STP1309-EB / STP11821S

Characterization of Damage Progression in Ceramic Matrix Composites Using an Integrated NDE/Mechanical Testing System

John, R
Research Engineer, University of Dayton Research Institute, Dayton, OH

Buchanan, DJ
Assistant Research Engineer, University of Dayton Research Institute, Dayton, OH

Stubbs, DA
Associate Research Engineer, University of Dayton Research Institute, Dayton, OH

Herzog, JA
Undergraduate Student Assistant, University of Dayton Research Institute, Dayton, OH

Pages: 16    Published: Jan 1997

Download this paper for $25 PDF (340K)          View License Agreement
Abstract

This paper discusses the use of an unique integrated Nondestructive Evaluation (NDE)/Mechanical test system to characterize the damage progression in a ceramic matrix composite (CMC) under tensile and fatigue loading conditions. During the tests, the effects of damage were characterized in situ using conventional extensometry, and ultrasonic surface and longitudinal wave transducers. The surface wave technique clearly identified the proportional limit of the composite, while the longitudinal wave technique captured the overall deformation behavior during the tension tests. Both ultrasonic NDE techniques showed equal or greater sensitivity to damage progression in the CMC compared to conventional extensometer-based modulus data.