Simulation Analysis Of The Hysteresis Heat Generation In Damping Rubber

Rubber has been widely used as a damping material due to its excellent hyperelasticity and damping properties.Under cyclic deformation,the hysteresis loss of the material dissipates as heat,which causes self-heating of the material,and then changes the dynamic viscoelastic properties of the material due to their temperature dependence.Thus,the cyclic deformation of rubber material is a thermomechanically coupling process in nature.This paper mainly studies the establishment process of rubber hyperelastic constitutive model,the calculation method and the finite element simulation process of hysteresis loss and selfheating of rubber,and further discusses the calculation method and finite element simulation process of rubber material fatigue by self-heating temperature rise.The specific research work and results are summarized as follows:1.ST,ET and PT tests were used to obtain the ogden constitutive model and related parameters of the rubber material.The accuracy of the constitutive model was verified by finite element simulation combined with experiments.2.A modified Kraus model was used to describe the variation of the dynamic loss modulus of rubber material with temperature,loading frequency and strain amplitude,then the hysteresis heat generation rate of the cyclic loaded rubber was given according to the theory of viscoelasticity and the corresponding calculation program was developed.Finally,the hysteresis heat generation behavior of rubber cylinder specimen and hourglass rubber damper under cyclic load were analyzed through deformation analysis,thermal analysis and thermo-mechanical coupling iterative calculation with ABAQUS finite element software,and the corresponding temperature field and the time history of the self-heating induced temperature rise were obtained for the cases of different load frequencies and strain amplitudes.It is shown that the numerical calculations are in good agreement with the measured values.3.It is a common concerned problem for academic and industrial researchers to evaluate the fatigue life of rubber dampers under cyclic load quickly and effectively.The commonly current used method for fatigue life evaluation is based on the S-N curve,which requires very long and costly fatigue tests.Due to the hysteresis loss during cyclic deformation,the temperature of the material rises,especially showing a sharp increase towards failure.Such sudden rise of temperature can be regarded as the precursor of fatigue failure.In this paper,the S-N curve in the traditional sense was experimentally determined using the maximum principal strain as the fatigue parameter.A link between the hysteresis temperature rise and the maximum principal strain was then established.Consequently,the self-heating temperature rise is connected with the fatigue life,so as to develop a method to efficiently evaluate the fatigue life of rubber structure.And a finite element fatigue simulation was carried out.