发动机螺栓连接强度有限元分析

用ANSYS校核6缸发动机的连接螺栓和飞轮的强度,结果表明:在预紧工况和最大扭矩工况下,连接螺栓的受力情况基本相同,飞轮的峰值应力出现在飞轮螺纹附近;当螺栓的拧紧力矩为95 N.m时,飞轮螺纹附近区域的最大拉应力为242 MPa,满足强度要求但裕量较小,螺栓最大应力在其材料的许用应力范围内.在实际安装过程中,螺栓拧紧力矩应小于95 N.m.该仿真分析结果可为6缸发动机飞轮制造提供参考.

Finite element analysis on connection strength of diesel engine bolts

The strength of a 6 cylinder engine connecting bolt and flywheel is calculated by ANSYS. The results show that the forces of connecting bolts under preload condition are almost the same with that under the maximum torque conditions, and the peak stress of flywheel is nearby the flywheel thread. When the bolt tightening torque is 95 N·m, the maximum tensile stress nearby the flywheel thread is 242 MPa. It meets the strength requirements, but the strength margin is little. The maximum stress of bolts meets the material allowable stress. In the practical installation process, the maximum tightening torque should be less than 95 N·m. The simulation results provide reference for the flywheel manufacture of 6 cylinder engine.