考虑温度和应变率效应的PET泡沫单轴压缩力学性能  

Uniaxial Compressive Mechanical Properties of PET Foam Considering Temperature and Strain Rate Effects

作　　者：金希红 毛敏捷 张豪 霍新涛 王锴 JIN Xihong;MAO Minjie;ZHANG Hao;HUO Xintao;WANG Kai(State Key Laboratory of Heavy Duty AC Drive Electric Locomotive Systems Integration,Zhuzhou 412001,China;College of Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China;College of Automotive and Transportation Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]大功率交流传动电力机车系统集成国家重点实验室,湖南株洲412001 [2]湖南大学机械与运载工程学院,湖南长沙410082 [3]合肥工业大学汽车与交通工程学院,安徽合肥230009

出　　处：《材料科学与工程学报》2024年第1期91-98,共8页Journal of Materials Science and Engineering

基　　金：中国中车株洲电力机车有限公司科技研发资助项目(2020KJ12)。

摘　　要：PET泡沫作为一种典型的热塑性泡沫材料,具有优异的力学性能及环保可回收特性,这使其在航空航天、船舶、轨道交通等领域具有较广泛的应用前景。PET泡沫单轴压缩性能受温度及应变率影响显著,然而目前依然缺乏可作为其工程分析与建模基础的足够的实验数据。为此,基于单轴压缩工况,开展了温度(20~100℃)和应变率(10-3~150 s-1)对其力学性能影响的研究。实验结果表明:PET泡沫具有温度软化效应和应变率敏感效应,其单轴压缩性能在玻璃化转变温度前后下降较为明显,动态压缩相较于准静态压缩力学性能有所提升。最后,基于实验数据,建立可以预测PET泡沫在不同温度下准静态压缩应力-应变关系的本构模型。本研究能够为PET泡沫材料的工程应用提供结构设计的基础数据和本构模型。As a typical thermoplastic foam material,PET foam has excellent mechanical properties and environmental recyclability,which makes it have great application prospects in aerospace,shipbuilding,rail transit and other fields.The uniaxial-compression performance of PET foam will be significantly affected by temperature and strain rate.However,there is still a lack of sufficient experimental data,which is the basis for its engineering analysis and modeling of PET foam.Thus,an experimental study on PET foam in uniaxial compression is conducted to reveal the effects of temperature(20-100℃)and strain rate(10-3 to 150 s-1)on the mechanical properties.The experimental results show that the PET foam exhibits temperature softening and strain-rate sensibility.The uniaxial compression property decreases sharply around the glass transition temperature,and the dynamic compressive properties are slightly improved for PET foam compared with the quasi-static compression.Finally,a constitutive model is developed based on the experimental data,in order to predict the quasi-static compressive stress-strain responses of PET foam at different temperatures.This study can provide the basic data and constitutive model of structural design of PET foam in the engineering application.

关 键 词：PET泡沫 温度效应 应变率效应 压缩性能 本构模型 

分 类 号：TQ328[化学工程—合成树脂塑料工业]