Abstract: The rubber compressibility has an important effect on the finite element analysis(FEA) of the rubber mount stiffness. The cylindrical rubber mount is analyzed as an studied object, and the radial stiffness of it is obtained using the finite element method supposing the rubber is incompressible and the radial stiffness is tested on the rig. The calculated stiffness is compared with the tested, and the result is that the calculated is not accorded with the tested very well, the offset is bigger. Based on above depictions, the viewpoint is put forward that the rubber compressibility should be modified properly. The poisson ration is adjusted to modify the compressible model, and when the stiffness from FEA are approximately consisted with that from the experiment, the poisson ration should be 0.42 for the modified rubber model. And then, the rubber compressible model is used on improving the mount, and to analyze the stiffness. At the same time, the experiments were done to verify it. The comparative results are that the FEA stiffness and the tested stiffness of the modified structure is approximately accordant, so it shows the modified method of the rubber compressible model is reasonable, and can be applied to the engineering.

Key words: Compressibility, Finite element method, Poisson ration, Rubber, Stiffness, 3D printing, Bionic Manufacturing, Brain tissue, Microstructure