温度荷载作用下GFRP-泡沫夹层结构Ⅱ型界面断裂韧性分析

摘要

研究不同温度对玻璃纤维增强复合材料(GFRP)-泡沫夹层结构的Ⅱ型界面断裂韧性的影响,首先分析不同温度对GFRP以及聚氨酯泡沫的压缩性能的影响.再按照端部开口弯曲试件(ENF)的方法测量GFRP-泡沫夹层结构的荷载-位移曲线.试验结果表明:随着温度的升高,极限承载能力逐渐降低.通过能量释放率(G)判据来分析界面的分层情况,并基于试验现象和数据的进一步分析,计算出界面应变能释放率(GⅡ),通过不同温度下GⅡ值的比较发现:当温度升高时,界面的应变能释放率逐渐降低.%This paper studied the effects of different temperatures on glass fiber enhanced composite (GFRP)-foam sandwich structure of mode II interface fracture toughness,the first analysis of the different temperature of GFRP and polyurethane foam compression performance impact.The load-displacement curve of GFRP-foam sandwich structure by end notched flexure (ENF) method was measured.The experimental results showed that the ultimate bearing capacity gradually decreasedwith the increase inthe temperature.The stratification of the interface was analyzed byusing the energy release rate (G) criterion.Based on the experimental observation and data analysis,the interfacial strain energy release rate GⅡ was calculated.The strain energy release rate at the interface of GⅡ was decreased gradually with the increase of temperature by comparing the values of GⅡ.