锻压技术

双壁间隙组合管整体弯曲成形特征分析

英文标题：Analysis on integral bending characteristics for double-wall gap composite tube

作者：张荣霞吴为曾元松陈福龙

单位：中国航空制造技术研究院塑性成形技术航空科技重点实验室数字化塑性成形技术及装备北京市重点实验室

分类号：TG306；V261.2+8

出版年,卷(期):页码：2021,46(4):166-171

摘要：

采用三维有限元模拟方法，分析双壁间隙组合管整体弯曲成形过程的应力和应变分布、壁厚分布及各组件间的接触，揭示弯曲过程的成形特征。结果显示：相比于单层管，双层管中内层管的等效应变相差不大，但外层管显著增大，说明更容易产生开裂，缺陷控制难度增大；内、外层管的中间填充物，在弯曲过程中与内、外层管之间有相对位移，产生摩擦力，且与外层管之间的摩擦力和弯曲方向相反，导致壁厚减薄量增加，壁厚分布不均匀。通过对实际试验件的壁厚进行测量，验证了有限元模拟结果与试验结果的规律一致，有限元模拟过程对物理试验具有有效的指导作用。

The stress and strain distribution, wall thickness distribution and contact between each component of double-wall gap composite tube during the integral bending process were analyzed by finite element method to reveal the forming characteristics of bending process. The results show that compared with single-layer tube, the equivalent strain of the inner tube for double-layer tube was little different, but the outer tube was significantly larger, indicating that cracks are more likely to occur and the difficulty of detect control is increased. In addition, the middle filler between inner and outer tubes has relative displacement with inner and outer tubes during the bending process to generate the friction force, and the friction force between outer tubes is opposite to the bending direction resulting in an increases in the thinning of wall thickness and the uneven wall thickness distribution. After measuring the wall thickness of test piece, it is verified that the results of finite element simulation are consistent with the rules of test results, and the finite element simulation process has an effective guiding role for physical tests.

基金项目：

航空科学基金（2013ZE25006）

张荣霞（1979-），女，硕士，高级工程师 E-mail：zrxia1979@163.com

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