Theoretical And Experimetal Study On Mechanical Properties Of Composite Metal Rubber

As a type of all-metal damping material,metal rubber has been widely applied to vibration abatement in various fields such as aerospace,warships,weapons equipment because of its high damping ratio and resistance to high and low temperature.However,among the current metal rubber products,the main design feature is single metal wire,which leads to a narrow selection of variable parameters in the design of metal rubber products with specific damping and stiffness.Based on this,in this dissertation,the concept of "composite metal rubber" made of many kinds of wires is put forward innovatively.The theoretical model of composite metal rubber is established;The quasi-static and dynamic tests of metal rubber materials are carried out and the changes in the influence of a variety of parameters on the mechanical properties of the composite metal rubber are obtained,the theoretical model is perfected in combination with the experimental data;Finally,the composite metal rubber is applied to a rotor system,and the performance of vibration and performance stability is verified.The specific content is summarized as follows.First,the concept of composite metal rubber which is made of many kinds of wires is put forward innovatively.According to the distribution pattern of wire in the composite metal rubber,the concept of "equivalent element" of composite metal rubber is put forward based on force and deformation equivalent;The three contact states of the equivalent element are unified by using the state factor,and the method of calculating the macroscopic state factor by experimental data is put forward innovatively;Based on this,the theoretical analysis model which can reflect the stiffness and damping capacity of the composite metal rubber material is established,which provides a design basis for the production of composite metal rubber products with certain performance expectation.Secondly,the quasi-static test is carried out on the composite metal rubber units.The tangent modulus and dissipation factor of the composite metal rubber are obtained by hysteresis loop;The macro quasi-static mechanical behavior of composite metal rubber material under the change of relative density,loading direction,strain amplitude and metal wire ratio is studied,the change law of mechanical of properties of the new material under various parameters is understood.Then,the dynamic mechanical properties of the composite metal rubber are tested.Using the equivalent relation of "same vibration amplitude,same dissipative energy",the composite metal rubber is equivalent to "spring-viscous damping system" and"spring-hysteresis damping system" respectively,the transformation relation between damping performance parameters of two equivalent systems is also obtained;Based on summarizing the existing test methods,by introducing phase information,a test method for dynamic mechanical properties of composite metal rubber materials has been perfected.The expression of dynamic mechanical properties,such as amplitude ratio,structural stiffness,equivalent viscous damping,dynamic loss factor and hysteresis damp:ing coefficient are derived.The influence law of relative density,loading direction,component proportion,loading mass and excitation level on dynamic mechanical properties of composite metal rubber is studied.Finally,under the guidance of the above design methods and specifications,the composite metal rubber material proposed in this dissertation is combined with the traditional squirrel cage elastic support,and is applied to a simulated rotor system,and the vibration damping performance and performance stability verification of the composite metal rubber are carried out.