PET泡沫三明治结构准静态弯曲和疲劳性能试验研究
Experimental study on quasi-static bending and fatigue properties of PET foam sandwich structure
王锴 1贾晓航 2张蓓 3余磊 2张豪 2姚如洋2
作者信息
- 1. 重载快捷大功率电力机车全国重点实验室,湖南株洲 412001
- 2. 湖南大学整车先进设计制造技术全国重点实验室,湖南长沙 410082
- 3. 湖南大学整车先进设计制造技术全国重点实验室,湖南长沙 410082;长安大学信息工程学院,陕西西安 710064
- 折叠
摘要
在材料尺度下,借助试验手段获得了聚对苯二甲酸乙二醇酯(PET)泡沫三明治结构各组分材料(PET泡沫芯层、铝合金面板以及胶粘剂)的力学性能,以及PET泡沫的玻璃化转变温度和微观拓扑形态.在结构尺度下,在不同温度下进行了三点弯曲准静态试验,探究了温度对弯曲性能的影响,揭示了温度对变形响应过程的影响机理;同时,开展了常温下的三点弯曲疲劳试验,分析了载荷水平和加载频率对失效模式、疲劳寿命和刚度退化等指标的影响;在此基础上,开展了计及温度效应的三点弯曲疲劳试验,探究了环境温度对PET泡沫三明治结构疲劳性能的影响.结果表明,温度效应会显著影响PET泡沫三明治结构在准静态和疲劳弯曲载荷作用下的变形和破坏机理.
Abstract
At the material scale,the mechanical properties of each component of polyethylene terephthalate(PET)foam sandwich struc-ture(PET foam core,aluminum alloy panel and adhesive),as well as the glass transition temperature and micro topological morphology of PET foam were obtained by experiments.At the structural scale,the three-point bending quasi-static experiments at different temperatures were conducted,and the influence of the temperatures on bending properties and influence mechanisms of temperature on deformation re-sponse process were investigated;meanwhile,three-point bending fatigue experiments were conducted at room temperature to analyze the effects of loading level and frequency on failure modes,fatigue life,stiffness degradation and other indicators;on this basis,three-point bending fatigue experiment considering temperature effect was conducted to explore the influence of environmental temperature on fatigue properties of PET foam sandwich structure.The results show that the deformation and failure mechanisms of PET foam sandwich structure under quasi-static and fatigue bending may be significantly influenced by temperature effect.
关键词
PET泡沫三明治结构/三点弯曲/疲劳/温度效应Key words
PET foam sandwich structure/three-point bending/fatigue/temperature effect引用本文复制引用
基金项目
湖南省自然科学基金资助项目(2022JJ40083)
长沙市自然科学基金资助项目(kq2202157)
博士后面上资助项目(2022M721090)
重载快捷大功率电力机车全国重点实验室开放课题(GZKFKT2022-013)
出版年
2024
NETL
NSTL
万方数据