Dynamic Young's modulus measurement by incident wave extracting for viscoelastic materials under variable water pressure

Abstract

This study presents a method for measuring the complex Young's modulus of viscoelastic materials under several water pressures. A Butterworth impulse is generated by an electromagnetic shaker and is employed to excite a bar-like sample which was attached inside the pressure vessel. The broadband mechanical parameters (including the storage modulus and loss factor) under variable water pressure conditions (0.1-5MPa) for two types of viscoelastic materials were obtained by incident wave extracting. The experimental results agree well with those obtained using a standard dynamic mechanical thermal analyzer and those obtained using resonant method, which proved that the method proposed in this study can directly determine the Young's modulus at frequencies ranging from 500 to 5000Hz under variable water pressure. This method provides simplified processing for underwater dynamic mechanical parameters measurements.