Search

Shape memory alloy pseudo-rubber (SMAPR) is a new kind of porous damping material for isolation and vibration mitigation, with complicated internal structures. In this study, a theoretical model of SMAPR was proposed through layer decomposition according to its micro-structure and fabrication process, as well as the nonlinear stiffness characteristics. First, a contacted micro-curved-beam (CMCB) was built and the relationship between the model parameters and physical quantities of SMAPR was obtained. Then the stiffness equation was derived. Based on the analysis of the non-linear stiffness of SMAPR, the relationship between the quantity of contact points and the compression strain increment was obtained for both of loading and unloading process. Subsequently, the layer constitutive model of SMAPR was proposed and verified. A parametric analysis was conducted to investigate the effects of nominal densities, diameters of SMA wires and coefficient of friction on the behavior of SMAPR. Results show that the proposed model is closer to the real state of SMAPR, and could reflect both of the influence of micro-parameters of SMAPR and fabrication process on the macro-properties. Parametric analysis shows that the elastic modulus of SMAPR increases with the increment of nominal density, diameter of SMA wires and coefficient of friction. [ABSTRACT FROM AUTHOR]