Study Of Static Buffering And Creep Properties Of The New Rubber Isolator

From the property of rubber material and different constitutive model, combiningthe actual load displacement curve of the new type of rubber material, polyurethane（PU）, the best model suitable for this material is found in this paper, using theevaluation function for rubber material with ANSYS.The main contents of this paper include:1.Analyzing the physical-mechanicalproperties of this PU material.2. Introducing the general creep characteristics of PUmaterial and the internal-external factors affecting its creep.3. The mechanical modeloverview of common viscoelastic material.4. Static basic experiments and creepexperiments of PU sample.5. Static basic experiments and creep experiments of PUvibration isolator.6. The finite-element numerical analysis and calculation of PUvibration isolator.7. Contrast analysis of the results of experiments and finite-elementcalculation on the PU vibration isolator.In order to get a more suitable constitutive model and a better description of thestatic and creep property of PU vibration isolator, a method of phenomenological theorybased on mathematical reasoning is adopted in this paper. Concrete ideas are as follows:firstly, obtain the elastic modulus and creep curves under different load, through thestatic compression and creep experiments of the PU sample (small cylinder).Then,determine the creep parameters related to the creep equation of the selected model byusing the MATLAB to carry out creep curve fittings. In finite element modeling ofPU sample with ANSYS, the creep parameters obtained by fitting these creepparameters are last generated into the creep calculation of the PU sample. If the result isconsistent with the laboratory test results, these parameters are available for continueduse for the material creep calculation of vibration isolator. This provides a new thoughtfor the theory design analysis of the PU vibration isolator.ANSYS is used as a computing tool to solve nonlinear problems of the model inthis paper because of the nonlinear property of PU. Based on the basic requirements ofreducing time and storage, the results by the solution of ANSYS is used again for thecreep calculation of model after solving the static problems. In order to validate theprecision of the finite element solution, experimental study is carried out on physicalmodels. Finally, compare the results of calculation by finite element prediction ofANSYS and test. If the load displacement curve basically agree, it suggests that staticsolution of PU vibration isolator, as well as the creep law analysis and prediction ofvibration isolator can be ideally obtained by the mathematical model built and finiteelement calculation method.Based on the PU vibration isolator model established and the numerical calculation,a method to choose the best constitutive equation suitable for materials used is proposedin this paper. The physical concept is clear, and can be more intuitive, concise andcomprehensive in describing the characteristics of the PU vibration isolator. Thismethod can be applied to other types of vibration isolator and can have a certain guidingsignificance to the application of PU materials in new type vibration isolator design.