温度-荷载作用下玻璃纤维增强塑料-泡沫夹层结构Ⅰ型断裂韧性分析
发布时间:2018-06-27 09:00
本文选题:夹层结构 + 双悬臂梁 ; 参考:《南京工业大学学报(自然科学版)》2017年01期
【摘要】:以玻璃纤维增加塑料(GFRP)-泡沫夹层结构为研究对象,在不同温度条件下,采用拉伸试验确定聚氨酯泡沫芯材料的拉伸性能;经差示扫描量热分析法(DSC)测试GFRP树脂的玻璃化转变温度;通过双悬臂梁(DCB)试验研究,测试不同温度(30、50、70和90℃)条件下,夹层结构的I型裂纹扩展形态和界面应变能释放率,分析温度对GFRP-泡沫夹层结构界面数性能的影响。结果发现:GFRP树脂的玻璃化温度为90℃;温度对聚氨酯泡沫的拉伸强度和拉伸模量影响较小;随着温度的升高,GFRP-泡沫夹层结构的荷载呈下降趋势,界面应变能释放率的峰值越来越大。运用能量释放率断裂准则判别裂纹扩展符合理论要求。
[Abstract]:The tensile properties of polyurethane foam core materials were determined by tensile test under different temperature, taking glass fiber reinforced plastics (GFRP)-foam sandwich structure as the research object. The glass transition temperature of GFRP resin was measured by differential scanning calorimetry (DSC), and the mode I crack growth morphology and interfacial strain energy release rate of sandwich structure were measured by double cantilever beam (DCB) test at different temperatures (30 鈩,
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