Experiment And Simulation Research On The Metal-net Rubber Buffer Under Impact Load

The Metal-net rubber material is a porous elastic dry friction damping material,which is made of fine metal wires and has a spatial network structure similar to rubber materials with good elasticity and metal characteristics.This kind of material can dissipate the impact load energy by relying on the deformation and dry friction of its own metal wire,thereby acting as a vibration isolation and buffering effect.It meets the requirements of military and civil applications such as ships,artillery,vehicles,aerospace,etc.Therefore,Metal-net rubber has a wide range of application prospects and research value in the field of impact resistance.This paper takes the mechanical properties of Metal-net rubber under impact load as the research object.The research content is as follows:1.A large-density cylindrical through-hole Metal-net rubber element was prepared.The relative density,compression amount and loading speed were used as control variables to conduct mechanical experiments on the large-density cylindrical through-hole Metal-net rubber element to analyze the relative density and compression.The change law of the amount and experimental loading speed on the equivalent stiffness and energy dissipation coefficient of the large-density cylindrical through-hole Metal-net rubber element.2.Using the Hopkinson rod experimental device,conduct dynamic compression experiments on the large-density cylindrical through-hole Metal-net rubber components,and analyze the relative density and strain rate to the equivalent dynamic stiffness of the largedensity cylindrical through-hole Metal-net rubber components The function equation between the equivalent dynamic stiffness and the strain rate of the large-density cylindrical through-hole Metal-net rubber element is obtained.3.According to the buffer design theory and impact dynamics theory under impact load,a high-density cylindrical through hole Metal-net rubber buffer is designed.Taking the relative density,preload,load,the pulse peak value and pulse width of acceleration shock excitation as control variables,the single pulse acceleration impact experiment is carried out on the large density cylindrical through hole Metal-net rubber,and the relative density is analyzed,Amplitude of monopulse shock excitation,The effects of pulse width,preload and load on the Metal-net rubber buffer are studied.4.The finite element model of high-density cylindrical through hole the Metal-net rubber buffer was established.According to the experimental parameters and fitting equations,the simulation analysis of high-density cylindrical through hole the Metal-net rubber buffer was carried out.By controlling the relative density,load,single pulse impulse excitation peak value and other variables,the simulation analysis of the rubber buffer was carried out,the acceleration impact experiment of high-density cylindrical through hole the Metal-net rubber is simulated,and the influence of relative density,load and impulse peak value on the shock resistance characteristics of high-density cylindrical through hole the Metal-net rubber buffer is analyzed.