摘要
基于三重非线性理论,运用ANSYS Workbench软件,研究O形密封圈沟槽底角对密封性能的影响。在沟槽底角a分别取80°、90°和100°的条件下,仿真分析了介质压力和摩擦系数变化时O形圈的VonMises应力和接触压力分布情况,以此为O形圈密封性能的判定依据。结果表明,在一定的初始压缩率(ε=15%)和摩擦系数(f=0.1)条件下,沟槽底角不同时O形密封圈的最大Von Mises应力和最大接触压力都随着介质压力的升高而增大,其中a=80°和a=100°时的Von Mises应力变化基本相同,且始终大于a=90°时的对应值;与其他两种沟槽底角相比,a=100°时O形圈主密封面上的最大接触压力较大,密封性能更好;在一定介质压力下,沟槽底角不同时O形密封圈在3个密封面上的最大接触压力都随着摩擦系数的增大而先降后升,但始终大于介质压力,从而可以确保其密封性能良好。
Based on triple nonlinear theory,the influence of groove bottom angle of O-ring on its sealing performance was studied by using ANSYS Workbench software. Under the condition that the groove bottom angle a is 80°,90° and 100°,respectively,the distributions of Von Mises stress and contact pressure of O-rings were analyzed with the changing of medium pressure and friction coefficient,and then were taken as the criteria of O-ring’s sealing performance. Simulation results show that,when the initial compression ratio ε=15% and friction coefficient f =0.1,the maximum Von Mises stress and contact pressure of O-rings at different groove bottom angles increase with increasing medium pressure,and Von Mises stress values at a =80° and a =100° are almost the same,which are always larger than that at a =90°. The maximum contact pressure on the main sealing surface is higher and the sealing performance is better when a =100°. Under a certain medium pressure,the maximum contact pressures on all three sealing surfaces of O-rings at different groove bottom angles drop at first and then rise with increasing friction coefficient,but are always higher than the medium pressure,which can ensure the good sealing performance of O-rings.
作者
许浩
曾良才
湛从昌
Xu Hao;Zeng Liangcai;Zhan Congchang(Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education, Wuhan University of Science and Technology,Wuhan 430081,China;College of Machinery and Automation,Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《武汉科技大学学报》
CAS
北大核心
2019年第4期284-289,共6页
Journal of Wuhan University of Science and Technology
基金
国家自然科学基金资助项目(51475338)
