【作者】 叶梦思； 李慧芳； 钱才富； 王友刚；

【Author】 Ye Mengsi;Li Huifang;Qian Caifu;Wang Yougang;College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology;Dalian Yiduo Piping CO.,Ltd;

【机构】 北京化工大学机电工程学院； 大连益多管道有限公司；

【摘要】 本文对某两层四波Ω形波纹管的液压成型过程进行了有限元数值模拟,分析了各层管坯成形后的应力场和应变场分布以及波高方向鼓波高度和壁厚减薄率,结果发现:波纹管液压成型过程中,卸载前最大等效应力出现在大圆弧上,卸载后最大等效应力出现在大圆弧与小圆弧过渡处;波纹管在液压成型过程中,最大塑性变形出现在波峰上,最大塑性应变达27%;波纹管液压成型过程中壁厚减薄严重,波峰处可达17%以上。将模拟所得的波形参数与实际液压成型结果相对比,成型厚度、波高方向鼓波高度等参数的相对误差均小于5%,说明采用有限元法对Ω形波纹管液压成型进行数值模拟是有效可信的。更多还原

【Abstract】 In this paper,finite element method was employed to simulate the hydraulic forming process of a two-layered and four-corrugated Ω-shape bellows.The stress and strain distributions during and after the forming process were analyzed.Wave height and wall thickness reduction were obtained from the simulation.Results show that the maximum equivalent stress(Mises stress)occurs at the large arc before unloading.But after unloading,the maximum equivalent stress(Mises stress)occurs at the connection area between the large arc and small arc; During the forming process,the maximum plastic deformation takes place at the bellows peak with the plastic strain being as high as 27%.The wall thickness reduction is serious and the reduction rate could be more than 17% at the bellows peak.The wave height,after-forming wall thickness were also measured from the experiments.It is found that the relative errors of results from the simulation compared with the experiments are less than 5%, implying that finite element simulation for the hydraulic forming of Ω-shaped bellows is effective and dependable.更多还原