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Effect of hygrothermal aging on the mechanical properties of IMA/M21E aircraft-grade CFRP composite
Composites and Advanced Materials ( IF 2.4 ) Pub Date : 2020-05-26 , DOI: 10.1177/2633366x20926520
Kishora Shetty 1 , Ramesh Bojja 2 , Shylaja Srihari 1, 3
Affiliation  

Unidirectional carbon fiber-reinforced plastic (CFRP) IMA/M21E polymer composite was manufactured by standard autoclave curing method. This is a new aircraft-grade CFRP composite presently used in the manufacture of aircraft wing parts. Test specimens as per ASTM standards for weight gain, tensile and compression tests were obtained from this composite laminates. Some of the test specimens were subjected to hygrothermal (hot–wet) aging in an environmental chamber under three different conditions, that is, (i) 45°C/85% relative humidity (RH), (ii) 70°C/85% RH and (iii) 55°C/100% RH until reaching moisture absorption saturation. Matrix-dominated mechanical properties, that is, transverse tensile and longitudinal compression were determined for dry and hygrothermally aged test specimens. During mechanical testing in a servo-hydraulic test machine, the respective hygrothermal conditions were maintained while testing. It was noted that the rate of moisture absorption increases progressively and reaches saturation around 0.76–1.24 wt% depending on the aging conditions. Moisture absorption followed Fickian diffusion behavior in all the conditions of the study. Also, a software program was developed to predict the moisture content and time of saturation. The predicted results from this software program correlated with experimental results. It was observed that the presence of moisture reduced the tensile strength significantly by about 9–31% and compression strength by about 2–8%. Microscopic observation of tested samples was carried out using scanning electron microscope to study the failure behavior.



中文翻译:

湿热老化对IMA / M21E飞机级CFRP复合材料力学性能的影响

单向碳纤维增强塑料(CFRP)IMA / M21E聚合物复合材料是通过标准的高压釜固化方法制造的。这是目前用于飞机机翼零件制造的新型飞机级CFRP复合材料。从该复合层压板获得根据ASTM标准进行的重量增加,拉伸和压缩试验的试样。一些测试样品在环境箱中的三种不同条件下经受了湿热(热湿)老化,即(i)45°C / 85%相对湿度(RH),(ii)70°C / 85相对湿度(%)和(iii)55°C / 100%RH,直到达到吸湿饱和为止。确定了干燥和湿热老化试样的基体主导的机械性能,即横向拉伸和纵向压缩。在伺服液压测试机中进行机械测试时,在测试时保持各自的湿热条件。需要注意的是,根据老化条件,水分吸收率会逐渐增加,并达到约0.76-1.24 wt%的饱和度。在所有研究条件下,水分吸收遵循Fickian扩散行为。此外,还开发了一个软件程序来预测水分含量和饱和时间。该软件程序的预测结果与实验结果相关。据观察,水分的存在使拉伸强度显着降低了约9–31%,压缩强度降低了约2–8%。使用扫描电子显微镜对测试样品进行显微镜观察以研究破坏行为。需要注意的是,根据老化条件,水分吸收率会逐渐增加,并达到约0.76-1.24 wt%的饱和度。在所有研究条件下,水分吸收遵循Fickian扩散行为。此外,还开发了一个软件程序来预测水分含量和饱和时间。该软件程序的预测结果与实验结果相关。据观察,水分的存在使拉伸强度显着降低了约9–31%,压缩强度降低了约2–8%。使用扫描电子显微镜对测试样品进行显微镜观察以研究破坏行为。需要注意的是,根据老化条件,水分吸收率会逐渐增加,并达到约0.76-1.24 wt%的饱和度。在所有研究条件下,水分吸收遵循Fickian扩散行为。此外,还开发了一个软件程序来预测水分含量和饱和时间。该软件程序的预测结果与实验结果相关。据观察,水分的存在使拉伸强度显着降低了约9–31%,压缩强度降低了约2–8%。使用扫描电子显微镜对测试样品进行显微镜观察以研究破坏行为。在所有研究条件下,水分吸收遵循Fickian扩散行为。此外,还开发了一个软件程序来预测水分含量和饱和时间。该软件程序的预测结果与实验结果相关。据观察,水分的存在使拉伸强度显着降低了约9–31%,压缩强度降低了约2–8%。使用扫描电子显微镜对测试样品进行显微镜观察以研究破坏行为。在所有研究条件下,水分吸收遵循Fickian扩散行为。此外,还开发了一个软件程序来预测水分含量和饱和时间。该软件程序的预测结果与实验结果相关。据观察,水分的存在使拉伸强度显着降低了约9–31%,压缩强度降低了约2–8%。使用扫描电子显微镜对测试样品进行显微镜观察以研究破坏行为。据观察,水分的存在使拉伸强度显着降低了约9–31%,压缩强度降低了约2–8%。使用扫描电子显微镜对测试样品进行显微镜观察以研究破坏行为。据观察,水分的存在使拉伸强度显着降低了约9–31%,压缩强度降低了约2–8%。使用扫描电子显微镜对测试样品进行显微镜观察以研究破坏行为。

更新日期:2020-05-26
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