Research On Mechanical Property Of Metal Rubber And Numerical Analysis Of Metal Rubber Cantilever Beam Model

Metal rubber is a new type of shock damping material made of winding,laying metal wires.It has good shock damping performance for its porous structure,and advantages of long service life,high and low temperature resistance,corrosion resistance,strong plasticity,strong damping,and wide bearing range for its metal material,and it has currently been used in aerospace,mechanical engineering,weapon manufacturing,transportation and other areas.Metal rubber relies on the dry friction damping between its internal metal wires comparing with the viscoelastic damping of traditional rubber,and it can better reduce vibration through friction after being loaded.However,the complex contact among the internal metal wires renders the mechanical properties unstable,thus static compression and cyclic loading tests are carried out on metal rubber specimens in view of these problems,and the mechanical properties of metal rubber are analyzed through testing curves.Meanwhile,the metal rubber is numerically simulated,and its static micro and dynamic mechanical model are simulated and analyzed,then the testing results and the simulation results are compared to verify the feasibility of the simulation.Specific works are carried out from the following aspects:1.The three stages(linear elastic stage,soft characteristic stage,and exponential hardening stage)of the metal rubber static loading process are introduced in detail.Different microscopic models of metal rubber(cantilever beam model,Sauveur model,porous material model,microelement spring model)are introduced,and the microscopic model of the cantilever beam is selected as the subsequent simulation model according to the characteristics of each microscopic model.2.Static compression tests for different relative densities of metal rubber are carried out,and the stress-strain curve through sorting out and analyzing the testing data is drawn,then the least square method is used to fit the curve to obtain the constitutive equation of the metal rubber.The metal rubber is subjected to a cyclic loading test,and a stable displacement-load curve is obtained,then the hysteresis loop diagram under different relative densities is drawn.The image shows that the shock damping performance of the metal rubber decreases as the relative density of the metal rubber increases.When the relative density is at 0.4,it is no longer suitable as a shock damping material.Through ANSYS-Workbench,the metal rubber cantilever beam model is used to numerically simulate the cyclic loading test under different relative densities to verify the feasibility of the cantilever beam model.3.According to the shock resistance of metal rubber with different relative densities to different masses,numerical simulation of the macroscopic model of the metal rubber under shock load is carried out through ANSYS-Workbench,and the acceleration response of the metal rubber shock absorber is obtained through the simulation,then the simulation results and experimental results are compared and the errors are discussed and studied.It is found that when the load mass is 1.3kg,the results of the two data are similar,and the simulation test well simulates the process of shock test,however,when the load mass is 2.3kg,the error is bigger.4.According to the shock resistance of metal rubber with different relative densities to different masses,the acceleration response analysis under shock load is carried out through the ANSYS-Workbench simulation platform.The microscopic model of the metal rubber cantilever beam is used to simulate the force of the metal rubber shock absorber under the shock load,and the corresponding time-acceleration curve is drawn.The cantilever beam model is used to simulate the shock test of a metal rubber shock absorber with 2.3kg,and the simulation results are similar with the testing results of others.The validity of the cantilever beam model simulation is verified,and simulation tests for other relative density metal rubber shock absorbers are conducted.We conducted experiments to study the effect of shock load,relative densities,and load mass on the shock protection characteristics of a metal rubber isolator.