Fatigue behavior and life prediction of a SiC/Ti-24Al-11Nb composite under isothermal conditions. Ph. D. Thesis

Technical Report · Thu Aug 01 04:00:00 EDT 1991

OSTI ID:5122414

Bartolotta, P A

Metal Matrix Composites (MMC) and Intermetallic Matrix Composites (IMC) were identified as potential material candidates for advanced aerospace applications. They are especially attractive for high temperature applications which require a low density material that maintains its structural integrity at elevated temperatures. High temperature fatigue resistance plays an important role in determining the structural integrity of the material. This study attempts to examine the relevance of test techniques, failure criterion, and life prediction as they pertain to an IMC material, specifically, unidirectional SiC fiber reinforced titanium aluminide. A series of strain and load controlled fatigue tests were conducted on unidirectional SiC/Ti-24Al-11Nb composite at 425 and 815 C. Several damage mechanism regimes were identified by using a strain-based representation of the data, Talreja's fatigue life diagram concept. Results of these tests were then used to address issues of test control modes, definition of failure, and testing techniques. Finally, a strain-based life prediction method was proposed for an IMC under tensile cyclic loadings at elevated temperatures.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
• OSTI ID: 5122414
• Report Number(s): N-91-30566; NASA-TM--105168; E--6459; NAS--1.15:105168
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
FAILURE MODE ANALYSIS
FATIGUE
FIBERS
HIGH TEMPERATURE
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
NIOBIUM ALLOYS
SERVICE LIFE
SILICON CARBIDES
SILICON COMPOUNDS
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
TITANIUM ALLOYS
TITANIUM BASE ALLOYS