Research on testing method for damping loss factor of non self supporting materials

Based on the differences between time-domained and frequency-domained methods, this article proposes an combined testing method for the DLF of non self-supporting materials by using the Oberst beam method. That is, at low frequencies or small damping frequency points, use the DLF of the composite beam, which is obtained from the time-domained method, to replace the results from the frequency-domained method, then the loss factor of non self-supporting damping materials can be calculated. And it was applied to test the DLF of a certain rubber material, successfully obtaining damping results at four modal frequency points.