Constitutive Relationship of Sealing Material for Railway Bridge Joint
Polyether-type two-component polyurethane material is suitable for railway bridge joint sealing,which belongs to the isotropic hyperelastic material after curing.This paper summarizes and analyzes commonly used hyperelastic constitutive models based on molecular statistical thermodynamics and continuum phenomenology theory,as well as their applicability and limitations.The results indicate that the main deformation of polyurethane sealing materials used for railway bridge joints is tensile deformation.According to the working state and usage conditions of railway bridge joints,typical mechanical performance tests such as uniaxial tension and pure shear were used to fit the constitutive model of sealing materials,and the five parameter Rivlin model showed good simulation effect.The research results provide a reference for accurately simulating the mechanical behavior of sealing materials for joints under actual usage conditions.
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