一种双悬臂梁柔性销轴的微动疲劳研究
收稿日期: 2019-10-14
网络出版日期: 2021-04-02
基金资助
湖南省自然科学基金(2018JJ4006);长沙株洲湘潭国家自主创新示范区基金(2018XK2302);国家自然科学基金(51705442);湖南省创新型省份建设专项经费(2019GK4025)
Fretting Fatigue of a Kind of Flexible Pin of Double Cantilever Beam
Received date: 2019-10-14
Online published: 2021-04-02
大型齿轮增速箱的行星齿轮轴常采用过盈配合的双悬臂梁柔性销轴结构，而该处的过盈配合结构易产生微动疲劳．通过理论计算获得有效过盈量的最值，再利用有限元软件Abaqus模拟柔性销轴的弯曲受载过程，分析弯曲载荷、过盈量和渗碳层深度3个因素对接触应力、摩擦剪切应力以及滑移幅值的影响情况，探究各因素对微动疲劳损伤的影响程度，并使用SWT(Smith-Watson-Topper)临界平面法对销轴结构的疲劳寿命S-N曲线进行预测．对多组试件进行弯曲载荷疲劳加载试验，获得柔性销轴试验S-N曲线，并分析了试验后的构件表面微动疲劳损伤形貌．研究结果表明：弯曲载荷对疲劳寿命的影响大于过盈量的影响，也大于渗碳层深度的影响．采用SWT法预测的疲劳寿命与由试验获得的疲劳寿命吻合得较好．因此，在工程设计中可采用数值仿真分析对柔性销轴的疲劳寿命进行辅助校核.
杨世平, 董梦瑜, 李飞 . 一种双悬臂梁柔性销轴的微动疲劳研究[J]. 上海交通大学学报, 2021 , 55(3) : 236 -248 . DOI: 10.16183/j.cnki.jsjtu.2019.288
The double cantilever beam flexible pin structure with interference fit is usually adopted by the planetary gear shaft of large gear gearbox, and the interference fit structure at this location is prone to fretting fatigue. The maximum and minimum values of effective interference are theoretically calculated. Besides, the bending load process of flexible pin is simulated by using the finite element software Abaqus. In addition, the influences of bending load, interference and the depth of carburized layer on contact stress, frictional shear traction and slip amplitude are analyzed. Moreover, the influence degrees of various factors on fretting fatigue damage are investigated, and the S-N curve of flexible pin fatigue life is predicted by utilizing the SWT (Smith-Watson-Topper)critical plane theory method. Furthermore, the bending load fatigue loading test is conducted on several groups of specimens, the S-N curve of the flexible pin test is obtained, and the fretting fatigue damage morphology of the component surface is analyzed after the test. The results show that the influence of bending load on fatigue life is greater than that of the interference, and the depth of the carburized layer. The fatigue life of SWT prediction is in good agreement with the test data. Therefore, numerical simulation analysis can be used to help check the fatigue life of the flexible pin in engineering design.
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