Maćkowiak Paweł
Faculty of Mechanical Engineering, University of Science and Technology, 85-796 Bydgoszcz, Poland.
Materials (Basel). 2025 May 6;18(9):2127. doi: 10.3390/ma18092127.
This study investigates the fatigue durability of Plexus MA300 methacrylic adhesive, which is employed in structural joints of metals, plastics, and composites. Cast adhesive specimens were subjected to cyclic tensile loads at a frequency of 5 Hz with a stress ratio = 0.1. Six load levels were tested. Hysteresis loops were recorded during testing and analyzed in detail. Significant differences in fatigue fracture characteristics were observed depending on load level. Specimens subjected to high loads exhibited a characteristic radial structure with a distinct crack initiation point, whereas specimens tested at lower loads showed more uniform, matte fracture surfaces. Hysteresis loop analysis revealed phenomena typical for polymers: creep and damping causing energy dissipation. Various fatigue approaches were compared: stress-based, strain-based, energy-based, and stiffness-based. The highest coefficient of determination (²) was obtained for the model based on strain energy density, indicating its superior utility in predicting the fatigue life of the tested adhesive. The obtained results contribute to the understanding of the fatigue behavior of methacrylic adhesives and provide practical data for structural joint design involving this material class.
本研究调查了用于金属、塑料和复合材料结构接头的普立万MA300甲基丙烯酸胶粘剂的疲劳耐久性。将浇铸的胶粘剂试样在应力比R = 0.1、频率为5 Hz的条件下承受循环拉伸载荷。测试了六个载荷水平。在测试过程中记录滞后回线并进行详细分析。根据载荷水平观察到疲劳断裂特性存在显著差异。承受高载荷的试样呈现出具有明显裂纹起始点的特征性径向结构，而在较低载荷下测试的试样则显示出更均匀、无光泽的断裂表面。滞后回线分析揭示了聚合物典型的现象：蠕变和阻尼导致能量耗散。比较了各种疲劳方法：基于应力的、基于应变的、基于能量的和基于刚度的。基于应变能密度的模型获得了最高的决定系数（R²），表明其在预测测试胶粘剂的疲劳寿命方面具有卓越的实用性。所得结果有助于理解甲基丙烯酸胶粘剂的疲劳行为，并为涉及此类材料的结构接头设计提供实际数据。
