基于液压胀形实验及增量理论构建管材本构关系

发布时间：2018-05-14 06:51

本文选题：管材液压成形 + 本构关系　；参考：《锻压技术》2015年02期

【摘要】：为了准确构建管材本构关系,提出一种新的依据管材液压胀形实验数据、运用增量理论构建管材本构关系的方法。通过采用三维应变测量分析系统在线实时测量管材胀形实验中胀形区的三维位移场,并通过计算获得三维应变场、壁厚减薄等,避免了对管材胀形轮廓形状的预先假设。为了验证提出方法的可靠性,将运用增量理论、全量理论及单向拉伸实验确定的管材材料参数分别用于管材液压胀形实验的有限元模拟,并将模拟得到的管材的最大胀形高度、胀形轮廓形状与实验结果进行对比。结果显示,基于增量理论法获得各项结果的偏差均最小,在6.7%范围以内,故基于增量理论的方法能更准确地预测管材材料的本构关系。
[Abstract]:In order to construct the constitutive relation of pipe material accurately, a new method of building the constitutive relation of pipe is built on the basis of the experimental data of tube hydraulic expansion, and the three-dimensional strain measurement analysis system is used to measure the three-dimensional displacement field of the bulging area in the tube expansion experiment in real time by using a three-dimensional strain measurement and analysis system, and the three-dimensional strain field is obtained by calculation and the wall thickness is reduced. In order to verify the reliability of the proposed method, in order to verify the reliability of the proposed method, the incremental theory, the full quantity theory and the pipe material parameters determined by the unidirectional tensile test are applied to the finite element simulation of the tube hydraulic expansion experiment, and the maximum bulging height and bulging contour of the tube are simulated. The results are compared with the experimental results. The results show that the deviation of the results based on the incremental theory is the least, which is within the range of 6.7%. Therefore, the constitutive relation of the material can be predicted more accurately based on the incremental theory.

【作者单位】：桂林电子科技大学机电工程学院;
【基金】：国家自然科学基金资助项目(51271062) 广西自然科学基金资助项目(2013GXNSFAA019305) 制造系统与先进制造技术广西重点实验室开放基金项目(14-045-15-005Z)
【分类号】：TG39

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