Bonsu Alex Osei, Mensah Comfort, Liang Wenyan, Yang Bin, Ma Yunsheng
College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China.
School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200070, China.
Polymers (Basel). 2022 Aug 25;14(17):3480. doi: 10.3390/polym14173480.
This work aims to evaluate the failure mechanisms of plain glass and basalt fiber reinforced composites and a selected glass/basalt hybrid composite sequence subjected to artificial seawater conditions. Sets of plain and five hybrid composite configurations were fabricated by vacuum assisted resin injection technique (VARI), and subjected to seawater aged for 258 days at 30 °C and 70 °C followed by tensile, flexural and charpy impact testing, respectively. Failure analysis for dry and seawater-aged composites were undertaken using scanning electron microscopy (SEM). Results showed that some hybrid laminates with sandwich-like and alternating sequencing exhibited superior mechanical properties and ageing resistance than plain laminates. GB3 ([B2G2]) type hybrid composite with basalt fiber outer plies retained 100% tensile strength and 86.6% flexural strength after ageing, which was the highest among all the laminates. However, GB4 ([BGBG]) type specimen with alternating sequencing retained the highest residual impact strength after ageing. SEM analysis on the failed specimens showed fiber breaking, matrix cracking and debonding caused by fiber-matrix interface degradation due to seawater exposure. However different hybrid configurations to a considerable extent prevented crack propagation across specimens, hence altering the overall damage morphology among different specimens.
这项工作旨在评估普通玻璃和玄武岩纤维增强复合材料以及选定的玻璃/玄武岩混杂复合材料序列在人工海水环境中的失效机制。通过真空辅助树脂注射技术（VARI）制备了普通复合材料和五种混杂复合材料构型的试样，并分别在30℃和70℃下进行258天的海水老化处理，随后依次进行拉伸、弯曲和夏比冲击试验。使用扫描电子显微镜（SEM）对干燥和海水老化后的复合材料进行失效分析。结果表明，一些具有类似三明治结构和交替排列顺序的混杂层压板表现出比普通层压板更好的机械性能和耐老化性。具有玄武岩纤维外层的GB3（[B2G2]）型混杂复合材料在老化后保留了100%的拉伸强度和86.6%的弯曲强度，这在所有层压板中是最高的。然而，具有交替排列顺序的GB4（[BGBG]）型试样在老化后保留了最高的残余冲击强度。对失效试样的SEM分析表明，由于海水暴露导致纤维 - 基体界面降解，从而引起纤维断裂、基体开裂和脱粘。然而，不同的混杂构型在很大程度上阻止了裂纹在试样中的扩展，因此改变了不同试样之间的整体损伤形态。
