Viscoelastic response of tungsten fiber reinforced Zr-based bulk metallic glass matrix composites

Based on the homogenization theory, a mechanical model to calculate the viscoelastic properties of tungsten fiber reinforced Zr-based bulk metallic glass matrix composites (W/Zr-BMGMCs) with periodic microstructure was formulated. The equivalent relaxation modulus of this composite material was then calculated in the Laplace domain combined with the finite element method. The creep compliance in the Laplace domain can be further achieved through the relaxation modulus expressed by Prony series fitted with the method of least squares. Consequently, equivalent composite modulus and creep compliance in the time domain can be obtained by means of inverse Laplace transform. The effects of the volume fraction of tungsten fiber on the equivalent viscoelastic properties of (W/Zr-BMGMCs) were further studied. The results demonstrate that a combined approach of the homogenization theory and the finite element formulation can effectively anticipate the viscoelastic properties of (W/Zr-BMGMCs) with periodic microstructure, and thus provide basis for effective optimization of this kind of composites. ©, 2014, Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals. All right reserved.