Finite Element Analysis Of Compression Heat Generation And Thermodynamic Coupling Of Carbon Black Filled Rubber

Carbon black filled rubber material is a composite vulcanized rubber material,which is widely used on rubber engineering product.It has many advantages such as simple preparation technology,excellent vibration reducing performance,low cost.However,due to the intrinsic viscoelastic,Carbon black filled rubber not only exhibits outstanding damping capacity,but also exists obvious temperature rise phenomenon.For instance,when the tire rolling with high speed,the temperature at tire shoulder.When working on high temperature and high frequency,the surviving life of tire decreases heavily.Therefore,studying heat-up property of rubber and predicting the temperature distribution are quite important for rubber material heat-up property investigation and rubber made component temperature prediction.Meanwhile,it is also important to analyze the internal temperature distribution,controlling the upper limit value of temperature,further directing formula design and analyzing material thermal damage.For this reason,We test and analyse the heat build up property of carbon black filled rubber,meanwhile calculate the energy dissipation.Finally,the thermal coupled finite model is built and the temperature and thermal transfer distribution are predicted.At the same time,the mechanism of heat build up is investigated.(1)Different phr of carbon filled compound rubber are made,and they are tested by RPA and vulkameter to analyze the relationship between dosage of carbon black and rheology property as well as vulcanization property.Furthermore,the quasi-static mechanical property,dynamic loss modulus,compress heat generation change with increased dosage of carbon black are analyzed.We also test the thermal conductivity and specific heat of vulcanized rubber.The result shows that as the dosage of carbon black increasing,the loss modulus of compound rubber and vulcanized rubber increase.The heat built up phenomenon become serious.Meanwhile,the thermal conductivity rise up,and the specific heat fall off.(2)The rubber dynamic compress model and thermal couple model are built.The detail process and matters need attention during modeling are illustrated.When building the mechanical model,It mainly concludes creating pedestal,pressure head,and rubber cylinder component,model assembling,setting contact condition,3D meshing,applied cycling loading.When building the thermal coupling model,It mainly concludes creating thermal step,applied thermal loading,defining convection and contact thermal boundary condition.Finally,submit the model to calculate.(3)The dynamic compression thermal mechanical coupling model of carbon black filled rubber was established.Fitting the hyperelastic property of vulcanized rubber with hyperelastic constitutive equation,calculating the stress and strain distribution.Work out energy dissipation rate at different conditions by MTS.The result shows that at the constant strain condition,the energy dissipation directly depends on the change of loss modulus.The FEA calculate data is well accordance with teat date.Meanwhile,the temperature distribution is predicted.This work not only analyzes the carbon filled amount affecting on dynamic property of rubber,but also predicts the rubber cylinder compression heat generation,revealing the mechanism of heat generation and transfer.It has significant engineering application value.