锻压技术

金属薄板单轴弹塑性屈曲变形与回弹的几何参数研究

英文标题：Study on geometric parameters of uniaxial elastoplastic buckling

作者：刘俊丁子祈韩先洪

单位：上海交通大学

分类号：TG30

出版年,卷(期):页码：2019,44(6):24-29

摘要：

针对金属薄板受压时产生的弹塑性屈曲现象，开展理论与实验研究。将薄板屈曲分成加载和卸载两个阶段进行分析，对加载阶段引入余弦函数轮廓假设，对卸载阶段引入平面应变假设，以此建立薄板屈曲的几何特征参数模型。以304不锈钢为例，结合一套多向拉压装置，开展了不同长度的金属薄板屈曲变形与回弹实验。根据本文模型计算试样回弹后的参数，并与实验数据进行对比，其中高度误差小于5.4%，长度误差小于2.5%。进一步对参数分析表明：回弹后的长度与高度均随试样原始长度的增加而增加，且前者接近线性关系；随着板厚增加，回弹后试样高度增加而长度减小。

For the elastoplastic buckling phenomenon of sheet metal under compressive load, both theoretical and experimental studies were conducted. Then, the buckling of sheet metal was divided into loading and unloading stages for analysis, and the geometric characteristic parameter model of sheet metal buckling was established by introducing cosine contour assumption into the loading stage and introducing plane strain assumption into the unloading stage. For 304 stainless steel, experiments on buckling deformation and springback of sheet metal with different lengths were conducted by a set of multi-direction tension and compression device, and the parameters of the specimen after springback were calculated and compared with the experimental data. The results show that the height error is less than 5.4% and the length error is less than 2.5%. Further analysis of the parameters shows that the length and height of the specimen after springback increase with the increasing of the original length of the specimen, and the former is close to the linear relationship. With the increasing of sheet thicknesses, the height of the specimen increases, and the length of the specimen decreases after springback.

基金项目：

国家自然科学基金资助项目（51775336）

刘俊(1994-)，男，硕士研究生 E-mail：yaoyechengming@sjtu.edu.cn 通信作者：韩先洪(1977-)，男，博士，副研究员 E-mail：hanxh@sjtu.edu.cn

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