摘要
基于ABAQUS有限元分析软件,首先计算和分析了在变弹性模量和常弹性模量条件下的21-6-9高强不锈钢管绕弯成形过程,并将两种情况下的模拟结果与实验结果进行对比验证,发现采用变弹性模量可使截面畸变率和壁厚减薄率的预测精度分别提高31. 8%和11. 8%。然后在变弹性模量条件下研究了几何参数对管材绕弯成形截面畸变和壁厚减薄的影响。结果表明,当弯曲角不大于45°时,截面畸变率曲线和壁厚减薄率曲线均呈抛物线状;当弯曲角大于45°时,截面畸变率从弯曲平面到初始弯曲平面的分布呈先快速增加,后缓慢减小,再缓慢增加,最后急剧减小的特征;壁厚减薄率从弯曲平面到初始弯曲平面的分布呈先急剧增加,后趋于稳定,最后急剧减小的特征。截面畸变率和壁厚减薄率随相对弯曲半径的减小而增加,相对弯曲半径以不小于2. 0为宜;截面畸变率随管材壁厚的减小,直径的增加或直径和壁厚的等比例增加而增加;壁厚减薄率随管材壁厚的增加先增加后减小,随管材直径的增加或直径和壁厚的等比例增加而减小。
Based on ABAQUS analysis software,the rotary draw bending processes of 21-6-9 high-strength stainless steel tube under the condition of variable elastic modulus and constant elastic modulus were calculated and analyzed firstly,and the simulation results under the above conditions were compared with the experimental results. It is found that the prediction accuracy of cross section deformation ratio and wall thickness thinning ratio is improved by 31. 8% and 11. 8% respectively by using variable elastic modulus. Then,the influences of geometric parameters on the cross section deformation and wall thickness thinning of tube in rotary draw bending were explored under the condition of variable elastic modulus. The results show that when the bending angle is no larger than 45°,the cross section deformation ratio curve and wall thickness thinning ratio curve are parabolic. When the bending angle is larger than 45°,the distribution of cross section deformation ratio from the bending plane to the initial bending plane firstly increases rapidly,then decreases slowly,then increases slowly and finally decreases sharply. The distribution of wall thickness thinning ratio from the bending plane to the initial bending plane firstly increases rapidly,then tends to be stable and finally decreases sharply. Both cross section deformation ratio and wall thickness thinning ratio increase with the decrease of the relative bending radius,and the relative bending radius should be no less than 2. 0. The cross section deformation ratio increases with the increase of tube diameter and with equal proportion of diameter and wall thickness or with the decrease of wall thickness. The wall thickness thinning ratio firstly increases,then decreases with the increase of tube wall thickness,and decreases with the increase of tube diameter and with equal proportion of diameter and wall thickness.
作者
欧阳芳
鲁世强
方军
王克鲁
欧阳德来
OUYANG Fang;LU Shi-qiang;FANG Jun;WANG Ke-lu;OUYANG De-lai(National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,Nanchang 330063,China;School of Materials and Mechatronics,Jiangxi Science and Technology Normal University,Nanchang 330038,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2020年第1期27-37,共11页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51761029)
江西省自然科学基金资助项目(20192BAB216022)
江西省教育厅科学技术研究项目(GJJ150810
GJJ180615)
轻合金加工科学与技术国防重点学科实验室开放基金项目(gf201501001)
关键词
21-6-9高强不锈钢管
几何参数
截面畸变
壁厚减薄
有限元模拟
21-6-9 high-strength stainless steel tube
geometrical parameter
cross section deformation
wall thickness thinning
FE simulation
