Śliwa-Wieczorek Klaudia, Zając Bogusław
Faculty of Civil Engineering, Cracow University of Technology, 24 Warszawska Str., 31-155 Cracow, Poland.
Polymers (Basel). 2021 Aug 27;13(17):2873. doi: 10.3390/polym13172873.
Double lap adhesive connections made of Sika PS and Monolith EP2579-1 were studied experimentally in shear tests. The destructive shear tests were conducted under a quasi-static load at 20 °C and 80 °C. The aim was to study the impact of elevated temperature on the load capacity of the joint and make a comparative analysis of the results for two types of adhesives: polyurethane Sika PS (flexible) and epoxy Monolit EP 2579-1 (rigid). The impact of adhesive layer thickness (t = 1, 2 and 4 mm) on the structural response of the joint was tested in two temperature ranges. A distinct impact of the temperature on the joint deformability was noticed. A visual assessment of the joint failure was performed and the initiation and form of failure was described. At 20 °C, the ultimate loading for epoxy adhesive joint depending on the joint thickness (t) was greater than for the polyurethane joint by, respectively, 282% for t = 1 mm, 88% for t = 2 mm and 279% for t = 4 mm. It was proved that the temperature increases to 80 °C in case of both adhesives reduces the mean destructive force in comparison with the measurements made at 20 °C. For the Sika PS (PUR two-component polyurethane) adhesive, the greatest load capacity decrease was measured for the joint of thickness t = 2 mm (55%), and in case of the epoxy adhesive for the joint of thickness t = 4 mm (89%). It was found that after reaching the destructive force the flexible joints retain a partial load capacity contrary to the rigid joints.
对由西卡PS胶和莫诺利特EP2579 - 1制成的双搭接胶粘剂连接进行了剪切试验研究。破坏性剪切试验在20℃和80℃的准静态载荷下进行。目的是研究温度升高对接头承载能力的影响，并对两种胶粘剂：聚氨酯西卡PS（柔性）和环氧莫诺利特EP 2579 - 1（刚性）的结果进行对比分析。在两个温度范围内测试了胶粘剂层厚度（t = 1、2和4毫米）对接头结构响应的影响。注意到温度对接头变形能力有明显影响。对接头失效进行了目视评估，并描述了失效的起始和形式。在20℃时，环氧胶粘剂接头的极限载荷，对于厚度为t = 1毫米的接头比聚氨酯接头分别大282%，对于t = 2毫米的接头大88%，对于t = 4毫米的接头大279%。结果表明，与在20℃下的测量相比，两种胶粘剂在温度升至80℃时均降低了平均破坏力。对于西卡PS（双组分聚氨酯）胶粘剂，厚度为t = 2毫米的接头测得的承载能力下降最大（55%），而对于环氧胶粘剂，厚度为t = 4毫米的接头下降最大（89%）。研究发现，达到破坏力后，柔性接头与刚性接头不同，仍保留部分承载能力。
