Influence of air and material damping on dynamic elastic modulus measurement
In this paper, air and material damping effects on the dynamic elastic modulus measurement of a flexural vibrating beam with free ends are evaluated, according to the Bernoulli-Euler beam equation. The theoretical analysis indicates that the measured elastic modulus is not substantially influenced by material damping. However, the measured modulus decreases with an increasing extent of air damping. In addition to theoretical analysis, experimental results for glass and alumina specimens also show that air damping decreases the measured modulus.
KeywordsPolymer Alumina Elastic Modulus Theoretical Analysis Measured Modulus
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