A study for evaluation method of viscoelastic materials under dynamic loading

Indirect impact method using fixed end reflection was newly proposed as the technique for evaluating the dynamic characteristic of viscoelastic materials. A cylindrical specimen is sandwiched between a viscoelastic input bar and a rigid wall, and is tested impacting the input bar. The reflection and the transmission at interfaces as well as the longitudinal wave propagation in viscoelastic bars were analyzed based on the elementary theory in the frequency domain. Some kinds of viscoelastic materials were tested using the proposed method, and the dynamic properties of the materials were evaluated within the frequency of about 15kHz. Moreover, the validity of the proposed method was examined by comparing with the conventional methods. Consequently, it is shown that the proposed method could easily decide the characteristic values of various materials in the elastic region with high accuracy. (C) 2011 Published by Elsevier Ltd. Selection and peer-review under responsibility of ICM11