Loss Factors Measured in Metal Matrix Composite Materials.
Final rept. 14 Sep 82-30 Nov 83,
BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA
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The resonant dwell technique was used to measure loss factors at the fundamental frequency of a number of cantilever beam samples 100 to 200 Hz. Nine different metal matrix composites, three unreinforced base metals, and eight configurations of FPAL203ZE41AMg were tested at three temperatures and four peak sample stress levels below 30,000 psi. The results indicate increasing loss factor with increasing stress level. Loss factors of all composites except graphitealuminum composites were lower than those of the corresponding base metal. For FPZE41Mg composites, higher losses were observed with heat treatment, lower fiber volume fraction, and or - 2212 deg fiber orientation. Trends of loss factor with temperature varied with material type. Author
- Laminates and Composite Materials