Abstract
An effect of the air on the material damping of triaxial woven fabric (TWF) composites has been investigated. Two types of TWF composites, i.e., basic and bi-plain weave, are used as reinforcement. An excitation test of TWF composites is carried out in the atmosphere and in the low-pressure chamber, respectively. Comparing the both of experimental results, the effects of an atmosphere on the natural frequency and on the damping ratio have been discussed. As a result, it may be concluded that the aerodynamic force has a great influence on the damping properties and few influence on the natural frequencies.
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