Axial load distribution and self-loosening behavior of bolted joints were numerically studied in this work. Finite element (FE) models with fine mesh threads were generated by analyzing the clearance of different thread fit qualities and thread profiles of MJ and Spiralock internal threads. By changing the thread clearance value, thread profile, engagement length, pitch value, and friction coefficients, their effects on axial load distribution, loosening behavior, and the dynamic response of bolted joints were explored with accurate three-dimensional FE models. In addition, experiments were conducted to investigate the dynamic response of bolted structures. Numerical results agreed with the theoretical results. For varying friction coefficients between the contact threads and between the bolt head and the bearing surfaces, the clamping force of bolted joints excited by torsional load changed in three cases: continuously decreasing, initially decreasing and then remaining constant, and initially decreasing and then fluctuating. Agreement was achieved by comparing between hysteresis loops generated by numerical and experimental methods.

数值研究了螺栓连接的轴向载荷分布和自松性能。通过分析MJ和Spiralock内螺纹的不同螺纹配合质量和螺纹轮廓的间隙，生成了具有细孔螺纹的有限元（FE）模型。通过更改螺纹间隙值，螺纹轮廓，啮合长度，螺距值和摩擦系数，使用精确的三维有限元模型探索了它们对轴向载荷分布，松弛行为以及螺栓连接动态响应的影响。此外，进行了实验以研究螺栓结构的动力响应。数值结果与理论结果吻合。为了改变接触螺纹之间以及螺栓头和轴承表面之间的摩擦系数，扭转载荷引起的螺栓连接的夹紧力在三种情况下发生变化：连续减小，先减小然后保持恒定，先减小然后波动。通过比较数值方法和实验方法产生的磁滞回线，实现了一致性。