Study on Contact Characteristics Between Rubber Asperity and Metal Surface Considering Creep Characteristics
Metal-rubber contact widely exists in sealing structure,and the interaction between asperities on the sealing contact surface directly affects the contact characteristics of the entire sealing interface,thereby affecting its sealing per-formance.Based on a single asperity of rough seal interface,the contact characteristics between the rubber asperity and the metal surface was studied by combining theoretical analysis and simulation research,considering the creep characteristics of rubber.Based on the results of compression creep experiment of rubber material,a calculation model of rubber creep was established.The finite element model between the hemispherical asperity and the metal plate was established,the simulation was conducted by considering the creep properties,and the contact characteristics were analyzed and compared with the calculated values of Hertz contact theory.The results show that with the increase of creep time at the creep stage,the con-tact radius,normal deformation and maximum equivalent creep strain all increase,and the maximum contact pressure de-creases,which may lead to the decline of sealing performance.With the increase of loads,the contact radius,normal deform-ation,maximum contact pressure and maximum equivalent creep strain all increase,but the increasing trend gradually de-creases.The equivalent modulus between the rubber asperity and metal surface decreases with the increase of creep time,and increases with the increase of loads.
seal interfaceasperityrubbercreepcontact characteristics
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