Nondestructive Methods for Evaluating Damage Evolution and Material Behavior in Metal Matrix Composites
Final technical rept. 15 Aug 93-14 Feb 1997
DAYTON UNIV OH RESEARCH INST
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The overall program consisted of two distinct phases with objectives Phase I Objective To characterize the evolution of isothermal fatigue damage using nondestructive evaluation techniques and correlate this information with residual strength of the composite. Phase II Objective To characterize and compare the evolution of damage due to creep and TMF fatigue of metal matrix composites SCS-6TI-6A1-4V manufactured by Textron Specialty Materials using nondestructive evaluation techniques and thereby derive an inefficiency factor for damage accumulation under in-phase thermomechanical fatigue IP-TMF. Phase I Results The first phase of the program concluded that the usefulness of ultrasonic nondestructive evaluation to assess fatigue damage in a 06 Sigma-1240Ti-6242 composites has been demonstrated through correlation of immersion and in situ ultrasonic data with residual tensile strength. Immersion surface wave scanning proved to be one of the most promising methods for correlating fatigue damage with the residual tensile strength for the composite used in this study. This study demonstrated that in situ nondestructive ultrasonic longitudinal wave and acoustic emission techniques can monitor the onset and accumulation of damage produced by either sustained loading or in-phased thermomechanical fatigue loading in a titanium matrix composite.
- Laminates and Composite Materials
- Test Facilities, Equipment and Methods