摘要
Foam-cored sandwich materials have been widely used in the civil engineering due to their advantages such as lightweight,high strength,and excellent anti-corrosion ability. However,the interfacial bonding strength of foamcored sandwich materials is weakened at elevated temperatures. In practice,the effect of high temperature cannot be ignored,because the composites and foams are sensitive to the change of temperature in the environment. In this study,a series of single-leg bending beams were tested at different temperatures to evaluate the influences of high temperatures on Mode Ⅰ/Ⅱ mixed interfacial fracture of foam core sandwich materials. The temperature was from29 ℃ to 90 ℃,covered the glass transition temperature of composites and foam core,respectively. The Mode Ⅰ/Ⅱ mixed interfacial crack prorogation and its corresponding interfacial strain energy release rate were summarized.
泡沫芯夹层材料以其轻质、高强、耐腐蚀等优点在土木工程中得到了广泛的应用。然而,泡沫芯夹层材料的界面结合强度在高温下有所减弱。在实际应用中,由于复合材料和泡沫材料对环境温度的变化非常敏感,高温的影响是不可忽视的。在本研究中,通过一系列单臂弯曲梁在不同温度下的试验来评估高温对泡沫芯夹层材料Ⅰ/Ⅱ型混合界面断裂的影响。温度范围为29~90℃,覆盖了复合材料和泡沫芯的玻璃化转变温度。总结了Ⅰ/Ⅱ型混合界面裂纹扩展及其相应的界面应变能释放速率。
基金
supported in part by the National Key Research and Development Program of China(No.2017YFC0703001)
the National Natural Science Foundation of China(No. 51678297).
作者简介
Corresponding author:Prof.WANG Lu is doctoral supervisor and associ ate dean at college of civil engineering,Nanjing Tech Uni versity.His research focuses on sandwich structures,timber structures and structural fire design,E-mail address:kevinlwang@njtech.edu.cn。
