Nondestructive Evaluation of Damage in Metal Matrix Composites
VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF ENGINEERING SCIENCE AND MECHANICS
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The major purpose of this work was to develop a technical base for the application of nondestructive evaluation methods to metal matrix composites. Objectives were established 1 To obtain base line data on non-destructive evaluation methods applied to metal matrix, fiber-reinforced composite coupon specimens with controlled, fabricated flaws 2 To investigate ways of modifying NDE methods for application to specimens having geometries other than the flat coupon specimens and 3 To apply appropriate NDE methods to other specimens that would be mechanically tested elsewhere. An evaluation of nondestructive techniques for determining damage in AlFP composite materials was performed and is presented here. The nondestructive techniques examined include X-ray radiography, ultrasonic C-scan, ultrasonic attenuation, video- thermography, replication, stiffness change, eddy current and acoustic emission. To control the location of damage development notches were manufactured into several specimens. After thorough initial nondestructive characterization, the specimens were fatigued in three point bending to initiate damage. The damage in the specimens was monitored at the intermediate fatigue stages by nondestructive evaluation techniques to determine which techniques best characterize the material condition. Replication, radiography and C-scan were determined to be the best NDE techniques used for evaluation of the FPAl composite.
- Laminates and Composite Materials
- Test Facilities, Equipment and Methods