滚珠式操纵软轴中滚珠接触应力分析  

Study on Contact Stress of Balls in Flexball

作　　者：陈开颜[1] 宋笔锋[1] 喻天翔[1] 张玉刚[1] 

机构地区：[1]西北工业大学航空学院,西安710072

出　　处：《机械科学与技术》2016年第2期171-175,共5页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(51105308);中央高校基本科研业务费专项资金项目(310201401JCQ008)资助

摘　　要：针对芯部滑杆与滚珠之间的多接触问题,基于冲击函数法,应用ADAMS软件进行动力学仿真分析,获得各芯部滑杆与滚珠之间的接触力。选取芯部滑杆受拉时,受接触力最大的dw8号滚珠作为研究对象,在ABAQUS环境下建立接触模型,求解接触应力参数。主要结论如下:1)推拉芯部滑杆时,芯部滑杆上下表面受交变接触应力,且最大应力幅值比滚珠大,使其较滚珠更易出现接触疲劳;2)Mises等效应力由芯部滑杆内部向外先增大后减小,而最大值出现在接触面以下一定距离,故疲劳裂纹多由芯部滑杆内部产生,而逐渐向其表面扩展。In order to acquire the contact force between balls and central rail, the ADAMS software was utilized to perform the dynamic simulation for the multi-contact problem of central rail and balls based on impact function method. The dw8 ball which experienced the maximum contact force was chosen as the research model for the case that the central rail was subjected to tension. Contact stress parameters were obtained with a contact model established in ABAQUS software. It can be concluded that： 1 ） When a central rail is being pushed or pulled, the alternative contact stress will exist on both upper and lower surfaces of the central rail and the stress amplitude is larger than that on the ball, which makes the surface of central rails be prone to contact fatigue damage; 2） The amplitude of Von Mises stress is firstly increased and then decreased from the inner to the outer, and the maximum amplitude occurrs slightly below the contact surface, which explains the reason why the fatigue cracks usually forms inside of the contact body and slowly extends to the surface. The simulation test and conclusions provide useful results for future study of the durability design of flexballs.

关 键 词：滚珠式操纵软轴 动力学仿真 接触应力 接触疲劳 

分 类 号：V249.11[航空宇航科学与技术—飞行器设计]