Abstract

This work is interested in the effect of water immersion on the low-velocity impact behaviour of carbon fiber reinforced epoxy composites. The woven composite laminates are manufactured using the prepreg technique. The specimen preparation and the impact tests are undertaken following the ASTM D 7136 standard. To ensure water saturation, the specimens were immersed in distilled water up to 368 h. The moist specimens were subjected to impact energies ranging between 15 and 85 J. The impact results and the compression-after-impact (CAI) properties are compared with those obtained under dry testing conditions. The moist composites show more significant damage reduction than the dry one. Larger damage area is also expected for wet plates when CAI strength is compared to the strength of notched specimens. Several equations have been proposed namely to model the threshold force, the peak force, the normalised absorbed energy, the normalised CAI strength and the strength of notched plates. All these equations show good agreement with experimental data.

摘要

这项工作对浸水对碳纤维增强环氧树脂复合材料的低速冲击行为的影响很感兴趣。编织复合层压板是使用预浸料技术制造的。试样制备和冲击试验按照 ASTM D 7136 标准进行。为确保水饱和，将试样浸入蒸馏水中长达 368 小时。潮湿的样品经受 15 到 85 J 的冲击能量。将冲击结果和冲击后压缩 (CAI) 性能与在干燥测试条件下获得的结果进行比较。潮湿的复合材料比干燥的复合材料显示出更显着的损伤减少。当将 CAI 强度与缺口试样的强度进行比较时，湿板的损伤面积也更大。已经提出了几个方程，即对阈值力、峰值力、归一化吸收能量、归一化 CAI 强度和缺口板强度进行建模。所有这些方程都显示出与实验数据的良好一致性。