Study On Damage Characteristics Of Rubber Materials Based On Microscopic Simulation

The rubber material has been widely used in various fields because of its excellent fatigue strength,unique softness and excellent sealing and electrical insulation.Rubber products are usually used in the dynamic load.Under the periodically dynamic load,the rubber material gradually produced mesoscopic defects,and then developed into a macroscopic crack.The emergence of cracks not only reduced the bearing capacity of rubber products,but also directly affect the service life of components.In this paper,the meso-level damage of rubber material is studied to further understand the process of meso-level damage in the process of fatigue,and provide the theoretical basis for the improvement,design and manufacture of rubber products.In this paper,based on ABAQUS and other finite element software,the extended finite element method was used to simulate the process of crack propagation and expansion of rubber material which was filled with carbon black at the meso-level.The main research contents were as following:(1)The stress-strain curve,tensile failure strength and plasticity parameters of the rubber material were obtained by testing the mechanical properties of the rubber material until the material was pulled off.Using uniaxial tension,uniaxial compression and plane stretching test data for constitutive model fitting,and it was showed that the third order Ogden model was the most ideal in several constitutive models.And the parameters of the constitutive model of the rubber material were fitted through the experimental data.(2)The 3D-modeling of the single-core model was established by ABAQUS,the random particle adsorption method was programed by Python language,and visual displayed via ABAQUS.The 3D-modeling of multi-core structure of carbon black filled rubber at the meso-level was established.The 3D-modeling was meshed and checked by finite element software,and the single-core model was subjected to the tensile test after the different unit types The results showed that there were no significant differences between the tetrahedral element and the hexahedral element.For the multi-core RVE model,the tetrahedral element can be used for the analysisand calculation.(3)In ABAQUS,the stress and strain distribution of the different structures of the rubber material at the meso-level were obtained and the maximum stress-strain position and the value were obtained by analyzing the loading of the material parameters,load loading and applying the boundary conditions.And the stress and strain curves were plotted against the uniaxial tensile test curves to verify the reliability of the analysis.The results showed that the carbon black had a stronger effect on the rubber properties.The higher the content,the more obvious the enhancement effect,but the hole played the opposite role.The results also showed that the enhancement was not only related to the content,but also closely related.to the interface bond strength.(4)Based on the static analysis,the extended finite element method was used to analyze the different structures of the rubber material at the meso-level,and the location and the extended path of the different structures were obtained.The position of the crack in each structure was basically the same as the position of the stress and strain in the static analysis.The prediction results were in accordance with the existing research results,and the interfacial strength between the different structural carbon blacks and the rubber matrix had a certain effect on the position of the structure at the time of loading.