铁路桥梁接缝用密封材料的本构关系  

Constitutive Relationship of Sealing Material for Railway Bridge Joint

作　　者：代冲 DAI Chong(Beijing-Shanghai High Speed Railway Co.Ltd.,Beijing 100038,China)

机构地区：[1]京沪高速铁路股份有限公司,北京100038

出　　处：《铁道建筑》2024年第2期81-85,共5页Railway Engineering

基　　金：京沪高速铁路股份有限公司科技研究项目(京沪科研-2020-17)。

摘　　要：双组分聚氨酯材料适用于铁路桥梁接缝密封,该材料固化后属于各向同性的超弹性体。本文总结分析了基于分子统计热力学和连续介质唯象学理论的常用超弹性体本构模型及其适用范围和局限性。结果表明:铁路桥梁接缝用聚氨酯密封材料的主要变形为拉伸变形;根据铁路桥梁接缝的工作状态和使用条件,采用单轴拉伸、纯剪切等典型力学性能试验拟合密封材料的本构模型时,五参数Rivlin模型模拟效果最好。研究结果为准确仿真接缝用密封材料在实际使用工况下的力学行为提供了参考。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.

关 键 词：铁路桥梁 桥梁接缝 密封 超弹性材料 本构关系 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]