Experimental Research on Fatigue Performance of M24 High-Strength Bolts Under Full Pretension
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摘要: 装配式建筑中高强度螺栓因其施工便捷、力学性能优异等特点成为主要连接方式。为研究预拉力对钢结构用高强度螺栓疲劳性能及破坏机理的影响,借助MTS Landmark370.50伺服液压疲劳试验机进行疲劳试验,得到了25个M24高强度螺栓轴拉常幅疲劳试验数据,并对疲劳断口进行电镜扫描分析。结果表明:满预拉力作用下螺栓基本断裂于螺杆与螺母咬合处的螺纹牙底,与无预拉力高强度螺栓疲劳断口相比,预拉力作用下螺栓疲劳断口瞬断区面积占比相对偏大,疲劳源相对单一,瞬断区韧窝密集但相对偏小。揭示了预拉力作用下螺栓疲劳破坏机理,并建立了M24高强度螺栓疲劳设计方法。Abstract: High-strength bolts in prefabricated buildings have become the main connection method due to their convenient construction and excellent mechanical properties. In order to study the influence of pre-tension on the fatigue performance and fatigue failure mechanism of high strength bolts for steel structure, the fatigue test was carried out by MTS Landmark370.50 servo hydraulic fatigue testing machine. The constant amplitude fatigue test data of 25 M24 high strength bolts were obtained, and the fatigue fracture was analyzed by scanning electron microscopy. The results showed that the bolt basically breaks at the bottom of the thread at the bite of the screw and nut under full pre-tension. Compared with the fatigue fracture of high strength bolt without pre-tension, the proportion of the instantaneous fracture area of the fatigue fracture under pre-tension was relatively large, the fatigue source was relatively single, and the dimples in the instantaneous fracture area were dense but relatively small. The fatigue failure mechanism of bolt under pre-tension was revealed, and the fatigue design method of M24 high strength bolt was established.
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