Abstract:Drived by the need to develop the key components with multifunctional performances such as lightweight, vibration-reduction and electrical conductivity for aviation aircraft, electic control box of vehicle, a copper-steel wire composite metal rubber with double-helix structure was designed and fabricated. The internal crosslinked meso-structure evolution of composite metal rubber was analysed by means of finite element simulation. In order to better understand the dynamic mechanical and the electrical properties of the copper-steel wire composite metal rubber, the experimental platforms for the dynamic loading test with variable excitation condition and the electrical resistance test were established. The damage factor was proposed to evaluate the fatigue failure of composite metal rubber. The effects of copper-steel mass ratio on the dynamic vibration reduction performance, fatigue damage and static/dynamic electrical resistance were invesitigated. The results show that the dynamic stiffness increases and the loss factor decreases with the increase of frequency and amplitude. The larger damage factor, the more sensitivity of dynamic stiffness fluctuation and loss factor fluctuation. The larger copper-steel mass ratio leads to the more serious dynamic wear of internal crosslinked wires. The electrical resistance decreases with the increase of static compression. With the increase of dynamic vibration cycle, the electrical resistance exhibits the increasing evolution, especially for the larger ratio of copper wire.