自润滑轴承磨损行为的数值仿真

On the Wear Simulation of Self-Lubrication Bearings

基于大型非线性商业有限元软件ABAQUS,开发了可用于计算自润滑轴承磨损情况的用户子程序。该子程序可以根据接触面上的压力和相对速度等条件计算出各节点的瞬时磨损速度,同时根据磨损量对磨损面上网格进行自动调节,以形成新的接触面和压力分布,从而实现轴承应力分布、局部接触压力、接触面积等物理量随磨损的增加而不断更新。基于ABAQUS和该磨损子程序,模拟了自润滑轴承在运行过程中衬套的长时间磨损情况,计算出了在运行过程中衬套不同区域的磨损量、接触压力和变形并分析他们随时间的演化过程。结果表明:在轴承磨损之后,尤其是经过长时间的磨损,实际接触压力和接触面积相对于初始情况会有很大的改变;基于ABAQUS和该磨损子程序得到的磨损深度以及接触压力等的演化情况与文献中的实验与计算结果相符,验证了建立的模型是有效可靠的。

A wear subroutine used for simulating long time wear behavior of self-lubrication bearing was developed and successfully combined with commercial non-linear FEA software, ABAQUS. This wear subroutine could calculate the instantaneous nodal wear rate from contact pressure and sliding speed ere,and then adjust contact surface profile automatically based on the change of wear depth to form new contact surface and pressure distribution.Thus, stress distribution of bearing,contact pressure,contact area ere.could be updated continuously with the change of wear depth during wear simulation.Based on the new developed wear subroutine,the wear behavior of self lubricated bearing during long time running was simulated,the wear depth,contact pressure and deformation in different regions of bushing during operation were calculated,and the evolution of them with time was analyzed.The simulation resuhs show that after long time wear,the real contact pressure and area is very different with the initial values.The predicted wear depth and contact pressure evaluation are consistent with the resuhs published in literatures,which validates the model is effective and reliablethe.