Effect of thickness and reinforcement configuration on flexural and impact behaviour of GFRP laminates after exposure to elevated temperatures
Effect of thickness and reinforcement configuration on flexural and impact behaviour of GFRP laminates after exposure to elevated temperatures
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DOI：
10.1016/j.compositesb.2018.08.054
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发表时间：
2019-01-15
影响因子：
13.1
通讯作者：
Oskouei, Asghar Vatani
中科院分区：
文献类型：
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作者：
Bazli, Milad;Ashrafi, Hamed;Oskouei, Asghar Vatani
本研究研究了玻璃钢层合板在高温下的弯曲和冲击行为。研究了纤维长度和取向度、层压板厚度和曝光时间对其性能的影响。共进行了540次三点弯曲试验和夏比冲击试验，以获得其力学性能。此外，还用扫描电子显微镜对降解机理进行了分析。最后，运用方差分析和线性贝叶斯回归方法对各变量的贡献率进行了统计分析，并建立了概率模型。结果表明，一般情况下，玻璃钢层板的弯曲和冲击性能随暴露温度和时间的增加而降低，随着层板厚度的减小而降低。研究还发现，单向纤维的层合板在高温下的性能最好，而纤维随机分布的层合板是最脆弱的类型。机织纤维层压板的性能几乎介于这两种类型之间。然而，所有类型的层合板在300摄氏度时几乎失去了所有的弯曲强度和冲击能量吸收能力。
This study investigates the flexural and impact behaviour of GFRP laminates after exposure to elevated temperatures. The effect of fibre's length and orientation, laminate's thickness, and exposure time is studied. A total number of 540 tests in terms of three-point bending and Charpy impact tests were conducted to obtain the mechanical properties. In addition, SEM analyses were carried out to investigate the degradation mechanisms. Finally, statistical study was conducted to investigate the contribution of each variable and develop probabilistic models using ANOVA and linear Bayesian regression method. The results showed that generally the flexural and impact properties of GFRP laminates decrease by increasing the temperature and time of exposure as well as decreasing the laminates' thickness. It is also observed that laminates with unidirectional fibres have the best performance under elevated temperatures, while laminates with randomly distributed fibres are the most vulnerable type. The performance of laminates with woven fibres are almost between those two other types. However, all types of the laminates lost almost all their flexural strength and impact energy absorption capacity at 300 degrees C.