DETERMINATION OF VISCOELASTIC MODEL FOR CFRP BY WAVE PROPAGATION TESTING

Longitudinal and torsional impact tests were individually performed on two types of CFRP (carbon fibre reinforced plastic) rods with a view to assessing the dynamic properties of the materials. The wave history resulting from the longitudinal impact tests on each CFRP rod was resolved into Fourier components in order to determine the complex tensile compliance. In a similar manner, the complex shear compliance was also obtained from the analysis of torsional impact tests. The viscoelastic models and parameters both for tension and for shear were subsequently determined based on the variations of the complex compliances with frequency. It was found for each material that the 4-element viscoelastic model should be applied to the dynamic behaviour of the materials both in tension and in shear over a wide frequency range.