Metal/Carbon-Fiber Hybrid Composites—Damage Evolution and Monitoring of Isothermal Fatigue at Low and Elevated Temperatures
Metal/Carbon-Fiber Hybrid Composites—Damage Evolution and Monitoring of Isothermal Fatigue at Low and Elevated Temperatures
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DOI：
10.3390/jcs6030067
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发表时间：
2022-02
影响因子：
3.3
通讯作者：
B. Khatri;Jan Rehra;S. Schmeer;U. Breuer;F. Balle
中科院分区：
文献类型：
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作者：
B. Khatri;Jan Rehra;S. Schmeer;U. Breuer;F. Balle
碳纤维增强聚合物 (CFRP) 是航空结构应用的标准轻质复合材料。在 CFRP 中添加金属纤维形成金属/碳纤维混合复合材料 (MCFRP) 已被证明可以改善弹性和塑性性能，并可以在材料的使用寿命内采用非破坏性方法进行结构健康监测。本文讨论了这些混合复合材料在 -55、25 和 120 °C 下的疲劳实验结果。使用高压釜方法制造的多向 CFRP 和 MCFRP 层压板在不同的疲劳载荷条件下进行了测试和比较，同时监测温度和电阻。另外还对 MCFRP 中选定的亚稳态奥氏体钢纤维进行了磁相测量。结果表明，由于钢纤维的存在，混合复合材料的延展性得到改善，从而在疲劳载荷下具有更好的性能，并且具有更少的脆性失效行为。根据亚稳态奥氏体钢纤维的化学成分，观察到温度和塑性变形相关的相变，这可能会产生一种在混合复合材料的使用寿命内无损结构健康监测的方法。
Carbon-fiber-reinforced polymers (CFRPs) are the standard lightweight composite material for structural applications in aviation. The addition of metallic fibers to CFRPs to form metal/carbon-fiber hybrid composites (MCFRPs) has been shown to improve the elastic and plastic properties and to enable a non-destructive method for structural health monitoring over the material’s service life. In this paper, the results from the fatigue experiments on these hybrid composites at −55, 25 and 120 °C are discussed. Multidirectional CFRP and MCFRP laminates, fabricated using the autoclave method, were tested and compared under different fatigue loading conditions, while being simultaneously monitored for temperature and electrical resistance. Magnetic phase measurements were additionally carried out for the chosen metastable austenitic steel fibers in the MCFRPs. The results show that the improved ductility of the hybrid composite due to the presence of the steel fibers leads to better performance under fatigue loads and a less-brittle failure behavior. Based on the chemical composition of the metastable austenitic steel fibers, a temperature and plastic deformation-dependent phase transformation was observed, which could potentially lead to a method for non-destructive structural health monitoring of the hybrid composite over its service life.