基于Bazier效应的薄壁管材连续矫直截面变形研究

发布时间：2018-11-13 14:34

【摘要】：薄壁管材在连续矫直过程中会在大弯曲变形阶段发生截面扁化(即Bazier效应),最大扁化量作为重要工艺参数,用以控制截面变形程度防止管材屈曲失稳。而目前现场仍沿用经验图表结合人工经验和反复试矫对其进行估定,亟待建立针对性的最大扁化量数学模型以指导生产,为此在对薄壁管材弯曲扁化变形应变分析的基础上,基于薄壳弹塑性理论及其相关假设,确定管材单位长度的应变能,运用最小势能原理得到最大扁化量解析模型,该模型与管材轴线的弯曲半径、管材的材料参数和几何参数有关。在应用现场试验证明有限元动态仿真可行性的基础上,通过大量仿真试验证明数学模型的正确性,为继续深入研究矫直相关工艺参数的合理设置、完善薄壁管材矫直理论体系奠定基础。
[Abstract]:Section flattening (Bazier effect) occurs in the continuous straightening process of thin-walled tubes, and the maximum flattening amount is used as an important process parameter to control the deformation degree of the section to prevent buckling instability of the pipe. At present, the field still uses the experience chart combined with artificial experience and repeated trial correction to estimate it. It is urgent to establish the mathematical model of the maximum flattening quantity to guide the production. Therefore, based on the analysis of the deformation strain of thin-walled pipe bending flattening, it is urgent to establish a mathematical model of the maximum flattening quantity to guide the production. Based on the elastic-plastic theory of thin shell and its related assumptions, the strain energy per unit length of pipe is determined, and the analytical model of maximum flattening quantity is obtained by using the principle of minimum potential energy, and the bending radius between the model and the tube axis is obtained. The material parameters of the pipe are related to the geometric parameters. On the basis of applying field test to prove the feasibility of finite element dynamic simulation, the correctness of mathematical model is proved by a large number of simulation experiments. In order to further study the reasonable setting of straightening related technological parameters, Perfect the theoretical system of thin-wall pipe straightening lay the foundation.
【作者单位】：东北大学机械工程与自动化学院;
【基金】：国家自然科学基金资助项目(51374063)
【分类号】：TG335.7

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