Niu Ruitao, Yang Yang, Liu Zhen, Ding Ziyang, Peng Han, Fan Yisa
School of Aerospace Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, China.
Institute of Mechanical Engineering, Materials and Transportation, Peter the Great Saint-Petersburg Polytechnic University, Saint-Petersburg 195251, Russia.
Polymers (Basel). 2023 Jul 29;15(15):3232. doi: 10.3390/polym15153232.
Fiber-reinforced polymers (FRPs) have great potential in shipbuilding. As a new type of material, basalt-fiber-reinforced polymer (BFRP) has received increasing attention due to its good economic and environmental performance. In this paper, BFRP single-lap joints (SLJs) bonded by Araldite2011 and Araldite2014 were selected as sample objects, the joints, aged for 240 h, 480 h, and 720 h, were experimentally analyzed in 3.5% NaCl solution/5% NaCl solution at 80 °C. The sequential dual Fickian (SDF) model was used to fit the water absorption process of the dumbbell specimen material. By comparison, the water absorption of the material occurred mainly on the adhesive and the water absorption of Araldite2011 was higher than that of Araldite2014. The decrease in the T of the aged joint adhesive was characterized by DSC, and the TG test showed that the polymer material in the joint was degraded by the damp-heat effect. The quasi-static tensile test showed that the decrease in joint failure strength was positively correlated with the water content of the solution. The Araldite2011 adhesive joint showed better mechanical properties and stability than the Araldite2014 adhesive joint, while the secondary crosslinking of the bound water with the polymer chain resulted in a slight increase in the stiffness of the aged joint. From comprehensive observation of the macro-section and SEM-EDX images, it is concluded that the failure mode of the joint changes from fiber tearing to mixed failure of fiber tearing and adhesive layer cohesion, and the plasticizing effect of the epoxy resin in the adhesive and chemical corrosion of salt ions weakens the adhesive layer's bond strength.
纤维增强聚合物（FRP）在造船领域具有巨大潜力。作为一种新型材料，玄武岩纤维增强聚合物（BFRP）因其良好的经济和环境性能而受到越来越多的关注。本文选取由Araldite2011和Araldite2014粘结的BFRP单搭接接头（SLJ）作为样本对象，对接头在80℃的3.5%NaCl溶液/5%NaCl溶液中老化240小时、480小时和720小时后进行实验分析。采用顺序双菲克（SDF）模型拟合哑铃形试样材料的吸水过程。通过比较，材料的吸水主要发生在胶粘剂上，且Araldite2011的吸水量高于Araldite2014。用DSC表征老化接头胶粘剂的T降低，TG测试表明接头中的聚合物材料因湿热效应而降解。准静态拉伸试验表明，接头破坏强度的降低与溶液含水量呈正相关。Araldite2011胶粘剂接头比Araldite2014胶粘剂接头表现出更好的力学性能和稳定性，而结合水与聚合物链的二次交联导致老化接头的刚度略有增加。通过对宏观截面和SEM-EDX图像的综合观察得出，接头的破坏模式从纤维撕裂转变为纤维撕裂和胶粘剂层内聚破坏的混合破坏，胶粘剂中环氧树脂的增塑作用和盐离子的化学腐蚀削弱了胶粘剂层的粘结强度。
