Kolář Viktor, Müller Miroslav, Tichý Martin, Mishra Rajesh Kumar, Hrabě Petr, Hanušová Kristýna, Hromasová Monika
Department of Material Science and Manufacturing Technology, Faculty of Engineering, Czech University of Life Sciences Prague, Kamycka 129, Suchdol, 16500 Prague, Czech Republic.
Department of Electrical Engineering and Automation, Faculty of Engineering, Czech University of Life Sciences Prague, Kamycka 129, Suchdol, 16500 Prague, Czech Republic.
Polymers (Basel). 2021 Aug 26;13(17):2872. doi: 10.3390/polym13172872.
This study is focused on the mechanical properties and service life (safety) evaluation of hybrid adhesive bonds with shaped overlapping geometry (wavy-lap) and 100% natural cotton fabric used as reinforcement under cyclic loading using various intensities. Cyclic loading were implemented between 5-50% (267-2674 N) and 5-70% (267-3743 N) from the maximum strength (5347 N) measured by static tensile test. The adhesive bonds were loaded by 1000 cycles. The test results demonstrated a positive influence of the used reinforcement on the mechanical properties, especially during the cyclic loading. The adhesive bonds Tera-Flat withstood the cyclic load intensity from 5-70% (267-3743 N). The shaped overlapping geometry (wavy-lap bond) did not have any positive influence on the mechanical performance, and only the composite adhesive bonds Erik-WH1 and Tera-WH1 withstood the complete 1000 cycles with cyclic loading values between 5-50% (267-2674 N). The SEM analysis results demonstrated a positive influence on the fabric surface by treatment with 10% NaOH aqueous solution. The unwanted compounds (lignin) were removed. Furthermore, a good wettability has been demonstrated by the bonded matrix material. The SEM analysis also demonstrated micro-cracks formation, with subsequent delamination of the matrix/reinforcement interface caused by cyclic loading. The experimental research was conducted for the analysis of hybrid adhesive bonds using curved/wavy overlapping during both static and cyclic loading.
本研究聚焦于具有异形搭接几何形状（波浪搭接）且使用100%天然棉织物作为增强材料的混合胶粘剂粘结在不同强度循环载荷下的力学性能和使用寿命（安全性）评估。循环载荷在静态拉伸试验测得的最大强度（5347 N）的5 - 50%（267 - 2674 N）和5 - 70%（267 - 3743 N）之间施加。胶粘剂粘结承受1000次循环加载。试验结果表明，所用增强材料对力学性能有积极影响，尤其是在循环加载期间。Tera - Flat胶粘剂粘结能承受5 - 70%（267 - 3743 N）的循环载荷强度。异形搭接几何形状（波浪搭接粘结）对力学性能没有任何积极影响，只有Erik - WH1和Tera - WH1复合胶粘剂粘结能承受5 - 50%（267 - 2674 N）循环加载值的完整1000次循环。扫描电子显微镜（SEM）分析结果表明，用10%氢氧化钠水溶液处理对织物表面有积极影响。去除了有害化合物（木质素）。此外，粘结基体材料表现出良好的润湿性。SEM分析还表明，循环加载导致了微裂纹形成以及随后基体/增强材料界面的分层。进行了实验研究，以分析在静态和循环加载期间使用弯曲/波浪搭接的混合胶粘剂粘结。
