摘要
目的聚脲弹性体作为一种多功能高分子聚合物材料,因其优异的理化性能,常作为建筑涂覆材料用于提高结构的力学性能。故以透明聚脲涂覆玻璃为研究对象,分析其动力学性能。方法通过分离式霍普金森压杆对涂覆不同聚脲厚度的试件开展动态冲击实验,由数据采集系统和高速摄影机对数据进行记录,从而研究透明聚脲涂覆玻璃在冲击荷载作用下的动态力学性能及破坏形态。结果在应变率120、220和400 s^(–1)下聚脲玻璃复合件相较于未涂覆聚脲玻璃的动态压缩强度分别下降了15.8%、16.8%和14.5%,破坏时间相较于未涂覆玻璃延长了240%,且延长的破坏时间与聚脲涂覆厚度呈正比。在不同应变率下聚脲玻璃复合件的耗能系数也均高于未涂覆玻璃,聚脲涂层的厚度也与耗能系数呈正相关趋势。结论聚脲能够减缓玻璃在冲击荷载下的裂纹扩展速度,延长玻璃破坏时间,并且聚脲的高吸能性和延展性使其在高速冲击下比普通玻璃具有更好的耗散能力。
Polyurea elastomer,as a multifunctional polymer material,is often used as a building coating material to enhance the mechanical properties of structures due to its excellent physical and chemical properties.Therefore,the work aims to analyze the dynamic properties of glass coated with transparent polyurea.Dynamic impact tests were conducted on specimens with different polyurea coating thicknesses by a split Hopkinson pressure bar,and data were recorded by a data acquisition system and a high-speed camera,thus studying the dynamic mechanical properties and failure patterns of transparent polyurea-coated glass under impact loads.At strain rates of 120,220,and 400 s^(–1),the dynamic compressive strength of the polyurea-glass composites decreased by 15.8%,16.8%,and 14.5%compared to that of uncoated glass,respectively.The failure time was extended by 240%compared to that of the uncoated glass,and this extended failure time was directly proportional to the thickness of the polyurea coating.The energy dissipation coefficient of the polyurea-glass composites was also higher than that of the uncoated glass at different strain rates,and there was a positive correlation between the thickness of the polyurea coating and the energy dissipation coefficient.The polyurea can slow down the crack propagation speed of glass under impact loads,and extend the failure time of the glass.Due to its high energy absorption and ductility,it exhibits better dissipation capacity than ordinary glass under high-speed impacts.
作者
向怡霖
邱爽
郭辉
陈玉
周自荣
XIANG Yiin;QIU Shuang;GUO Hui;CHEN Yu;ZHOU Zirong(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Sichuan Mianyang 621010,China)
出处
《包装工程》
CAS
北大核心
2024年第19期125-133,共9页
Packaging Engineering
基金
国家自然科学基金面上项目(12272330)
西南科技大学研究生创新基金资助(24ycx2055)。
