Semi-analytical estimates for overall response of porous elastomer filled with power-law fluid

摘要

? 2022 Elsevier LtdSemi-analytical estimates are derived for effective behavior of porous elastomeric composites, containing square arrangement of mono-disperse circular pores, filled with a non-Newtonian, power-law fluid. The elastomeric composite is kept in a reservoir of same fluid, such that the fluid from pores drains into a reservoir as the elastomer is compressed and upon relaxation of load the liquid gets sucked back into the pores. The estimates are compared with corresponding results obtained from numerical simulations. Finite element analysis software COMSOL multiphysics was used for the numerical simulations. The estimates for stored energy density and dissipation density of the composite match well with the simulation results. Stress–strain curves for the power-law fluid-filled composites are plotted under monotonic and harmonic loadings. Equivalent spring stiffness and damping coefficient, associated with uniaxial plane strain loading of these composites, are determined as a function of material properties of the elastomer and power-law fluid, and microstructural parameters of the unit cell. The derived expressions can be used to develop custom composite materials for suspension, impact protection, and vibration isolation applications. The present work is an extension of a previous work by the authors on overall response of Newtonian fluid-filled elastomers.