WJ-8扣件系统中弹性垫板的应力松弛性能研究  

Study on stress relaxation characteristics of elastic pad in WJ-8 fastener system

作　　者：罗玉媛[1] 唐功庆[1] 刘佳[1] 姜志国 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029 [2]北京市高分子材料加工重点实验室,北京100029

出　　处：《化工新型材料》2012年第12期152-154,共3页New Chemical Materials

摘　　要：对高速铁路轨道WJ-8扣件中的聚氨酯弹性垫板分别进行长时限压缩15%、20%、25%试验,并测定应力松弛过程。应用五元件广义Maxwell为模型,对应力松弛过程进行了数学回归。结果表明,五元件Maxwell模型可以完美拟合弹性垫板的应力松弛过程。随着应变增加,松弛时间呈下降趋势,即垫板抗形变能力减弱,垫板恢复原有形状能力下降。为WJ-8扣件承载限量预测、模拟工作特性研究和垫板分子结构设计提供理论依据。The polyurethane elastic pads in WJ-8 fastener for high speed railway were compressed by 15%, 20%, 25 % respectively for long time, and then measured the compression stress relaxation. Also, the generalized Maxwell model of five elements was established to do mathematical regression. The results showed that the generalized Maxwell model of five elements fitted perfectly with the behavior of stress relaxation of the elastic pad. The relaxation time was decreased with the addition of strain, indicating the weakness of deformation resistance. The work will provide theoretical basis for predicting the load bearing of fastener, working environment simulation, structure design of the elastic pad.

关 键 词：高速铁路 WJ-8扣件 垫板 Maxwell模型 应力松弛 

分 类 号：U213.532[交通运输工程—道路与铁道工程]