Sonic Fatigue Testing of a Functionally Graded Ti/TiB Material

摘要

The objective of this program was to determine how a functionally graded metal-ceramic material responds to high-frequency loading that is characteristic of sonic fatigue. This material has potential use as skins of aerodynamically heated structure and will experience fluctuating pressure that may result in sonic fatigue. Fatigue cracking starts in the brittle ceramic- rich layer. It was thought that the ductile metal-rich layers would increase the life of the specimen over a monolithic ceramic-rich specimen. This could not be confirmed nor refuted with the limited test data obtained. It was clear that a better sonic fatigue test method is needed for these types of materials. The current test method does not maintain sufficient control of the test.