Biography
Prof. Zaoyang Guo
Prof. Zaoyang Guo
Harbin Institute of Technology, China
Title: Micromechanics-Based Constitutive Modeling of Viscoelastic Particle-Reinforced Composites
Abstract: 
The micromechanics-based constitutive models are proposed for viscoelastic particle-reinforced composites in both the infinitesimal deformation and finite deformation regimes. A homogenization framework is first constructed for (finite-strain) viscoelastic composites, where the effective free energy density function of each phase is decomposed into the corresponding volumetric, isochoric and dissipative parts. The long-term (purely elastic) behaviors of both the matrix and particles are described by the incompressible neo-Hookean models in the finite deformation regime. The effective elastic free energy density functions of the two phases are computed based on a recently developed homogenization procedure in Guo et al. (Guo et al. in Mechanics of Materials 70 (2014), 1-17) and the average stress of each phase is can be derived. This homogenization procedure can be applied to the infinitesimal deformation regime. Cubic units with 27 non-overlapping randomly distributed same-sized spheres are constructed as the representative volume element (RVE) models of the particle-reinforced composites. The finite element simulations of various deformations with different strain rates are performed for the RVE models of different particle volume fractions and material parameters to validate the constitutive models. The simulation results show that the constitutive models can well predict the effective viscoelastic responses of the particle-reinforced composites in both the infinitesimal and finite deformation regimes.
Biography: 
Dr. Zaoyang Guo received his Ph.D. degree in Engineering Mechanics from Northwestern University (USA) in 2004. He worked as a lecturer at University of Glasgow (UK) from 2006 to 2010, then as a reader at Newcastle University (UK) from 2010 to 2011. After that, he returned back to China and worked as a professor at Chongqing University in November 2011. He then joined the Institute of Solid Mechanics, Beihang University in July 2014. Prof. Guo moved to the School of Science, Harbin Institute of Technology (HIT), Shenzhen in November 2017. His research interests include mechanics of composites, computational solid mechanics, and biomechanics. He has published more than 60 journal papers in solid mechanics.