This paper deals with the method of stress wave to measure the elastic modulus, loss modulus and their dispersion relationships against frequency of materials. By means of modulus measurements of two kinds of timber, when the frequency of vibration is higher than the base frequency, the elastic modulus is increased with frequencies; but the loss modulus decreases with frequencies.
YU Guan-xia, RUAN Xi-gen.
Analyses of Dispersion Relations of Dynamic Elastic Modulus in the Wood Materials[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2007, 31(01): 131-134 https://doi.org/10.3969/j.jssn.1000-2006.2007.01.031