轴向偏心交变载荷作用下螺纹副滑移研究

摘要

By analyzing the bolt jiont subjected to axial alternating load,the equations between slip angle of screw thread of bolt and the variation in load is established.Based on this,considering the load distribution on the thread of stay bolt under eccentric load,the eccentric load factor is introduced and then the theoretical model on the relationship between slip angle of screw thread and axial eccentric alternate load is obtained.The bolt-joint of M16×2 is calculated with the established theoretical model under specific load and compared with that obtained from finite-element method of Izumi under the same conditions,good agreement is obtained.The slip test of bolt connections under axial alternating loads are performed using vibration shaker,the slippage is measured and compared with the calculated results to validate the correctness of the theoretical formulation.The study provideds a theoretical analysis method to study the self-loosening of stay bolt.%通过对轴向交变载荷作用下的螺栓联接进行分析,建立螺栓螺纹副滑移角度与载荷变化之间的关系方程.考虑偏心载荷作用下拉杆螺栓螺纹载荷的分布规律,引入偏心载荷系数,建立螺纹副滑移角度与轴向偏心交变载荷之间关系的理论模型.针对M16×2螺栓联接,在具体载荷下运用所建的理论模型进行计算,并与同条件下Izumi的有限元研究成果相对比,结果相一致.运用螺栓联接振动试验台,在轴向交变载荷作用下对螺栓连接进行滑移实验,测量滑移量并与理论计算结果进行对比,验证理论推导的正确性,为研究拉杆螺栓自松弛机理提供一种理论分析方法.