Santos Paulo, Silva Abílio P, Reis Paulo N B
C-MAST-Centre for Mechanical and Aerospace Science and Technologies, University of Beira Interior, 6201-001 Covilhã, Portugal.
University of Coimbra, CEMMPRE, ARISE, Department of Mechanical Engineering, 3030-780 Coimbra, Portugal.
Materials (Basel). 2023 Jun 12;16(12):4332. doi: 10.3390/ma16124332.
The static bending properties, different strain rates and interlaminar shear strength (ILSS) of carbon-fiber-reinforced polymers (CFRP) with two epoxy resins nano-enhanced with carbon nanofibers (CNFs) are studied. The effect on ILSS behavior from aggressive environments, such as hydrochloric acid (HCl), sodium hydroxide (NaOH), water and temperature, are also analyzed. The laminates with Sicomin resin and 0.75 wt.% CNFs and with Ebalta resin with 0.5 wt.% CNFs show significant improvements in terms of bending stress and bending stiffness, up to 10%. The values of ILLS increase for higher values of strain rate, and in both resins, the nano-enhanced laminates with CNFs show better results to strain-rate sensitivity. A linear relationship between the logarithm of the strain rate was determined to predict the bending stress, bending stiffness, bending strain and ILSS for all laminates. The aggressive solutions significantly affect the ILSS, and their effects are strongly dependent on the concentration. Nevertheless, the alkaline solution promotes higher decreases in ILSS and the addition of CNFs is not beneficial. Regardless of the immersion in water or exposure to high temperatures a decrease in ILSS is observed, but, in this case, CNF content reduces the degradation of the laminates.
研究了两种用碳纳米纤维（CNF）纳米增强的环氧树脂的碳纤维增强聚合物（CFRP）的静态弯曲性能、不同应变率和层间剪切强度（ILSS）。还分析了侵蚀性环境，如盐酸（HCl）、氢氧化钠（NaOH）、水和温度对ILSS行为的影响。含有Sicomin树脂和0.75 wt.% CNFs的层压板以及含有0.5 wt.% CNFs的Ebalta树脂的层压板在弯曲应力和弯曲刚度方面有显著提高，高达10%。ILSS值随应变率的增加而增加，并且在两种树脂中，含有CNFs的纳米增强层压板对应变率敏感性表现出更好的结果。确定了应变率对数之间的线性关系，以预测所有层压板的弯曲应力、弯曲刚度、弯曲应变和ILSS。侵蚀性溶液显著影响ILSS，其影响强烈依赖于浓度。然而，碱性溶液会使ILSS下降幅度更大，添加CNFs并无益处。无论浸泡在水中还是暴露在高温下，都会观察到ILSS下降，但在这种情况下，CNF含量会降低层压板的降解。
