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通过疲劳试验研究了单面螺纹抽钉干涉配合复合材料连接结构的疲劳性能,分别考虑了紧固件类型、干涉配合量、搭接板材料及铺层次序等影响因素。采用了拉压疲劳试验,拉压比R=-1,循环应力水平则根据静载极限挤压强度值选定。根据疲劳试验循环应力和疲劳寿命曲线(S-N曲线),得到了不同影响因素对疲劳寿命的影响规律。结果表明,选择适当的干涉配合量、紧固件类型及搭接板均能提高结构的疲劳寿命,4种不同主板铺层次序均对结构疲劳寿命影响不大。
The fatigue properties of single-threaded screw interference fit composite connections were studied by means of fatigue tests. Influencing factors such as the types of fasteners, the amount of interference, the materials of overlap plates and the order of layups were respectively considered. Tension and compression fatigue test was adopted, with tension-compression ratio R = -1. Cyclic stress level was selected according to static load ultimate compression strength. According to fatigue test cyclic stress and fatigue life curve (S-N curve), the influence law of different influencing factors on fatigue life is obtained. The results show that the fatigue life of the structure can be improved by selecting the appropriate amount of interference, the types of fasteners and the lapped plates. The order of the four different main boards has little effect on the fatigue life of the structure.