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基于自由胀形的弯曲管材变形行为

孔德帅 郎利辉 阮尚文

孔德帅, 郎利辉, 阮尚文等 . 基于自由胀形的弯曲管材变形行为[J]. 北京航空航天大学学报, 2017, 43(7): 1395-1402. doi: 10.13700/j.bh.1001-5965.2016.0525
引用本文: 孔德帅, 郎利辉, 阮尚文等 . 基于自由胀形的弯曲管材变形行为[J]. 北京航空航天大学学报, 2017, 43(7): 1395-1402. doi: 10.13700/j.bh.1001-5965.2016.0525
KONG Deshuai, LANG Lihui, RUAN Shangwenet al. Deformation behavior of a bent tube based on free expansion[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(7): 1395-1402. doi: 10.13700/j.bh.1001-5965.2016.0525(in Chinese)
Citation: KONG Deshuai, LANG Lihui, RUAN Shangwenet al. Deformation behavior of a bent tube based on free expansion[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(7): 1395-1402. doi: 10.13700/j.bh.1001-5965.2016.0525(in Chinese)

基于自由胀形的弯曲管材变形行为

doi: 10.13700/j.bh.1001-5965.2016.0525
基金项目: 

国家科技重大专项 2014ZX04002041

国家自然科学基金 51175024

详细信息
    作者简介:

    孔德帅  男, 博士研究生。主要研究方向:充液成形技术

    郎利辉  男, 博士, 教授, 博士生导师。主要研究方向:液压柔性成形技术与装备

    通讯作者:

    郎利辉, E-mail:lang@buaa.edu.cn

  • 中图分类号: TG394

Deformation behavior of a bent tube based on free expansion

Funds: 

National Science and Technology Major Project 2014ZX04002041

National Natural Science Foundation of China 51175024

More Information
  • 摘要:

    随着制造业轻量化的发展趋势,复杂弯曲异形充液成形管件的应用日益广泛。为了更好地研究弯曲异形复杂管件在充液成形过程中的变形规律,进行可靠的工艺设计。本文通过结合薄膜理论和塑性变形理论对弯曲管件在自由胀形状态下的应力应变进行了理论解析,并通过有限元(FE)分析对理论计算模型进行了验证。FE分析结果与理论模型基本吻合。同时分析了管材在绕弯过程的硬化行为,并探索了在不同的弯曲硬化状态下弯曲管材在自由胀形过程下的破裂位置的规律,并且用实验进行了验证,实验结果与FE分析结果吻合。

     

  • 图 1  环壳胀形理论模型

    ABCD——管材截面在水平和竖直方向上的顶点。

    Figure 1.  Theoretical model of an internally pressurized torus

    图 2  参数k随相对弯曲半径的变化规律

    Figure 2.  Parameter k's variation pattern with relative bending radius

    图 3  参数k沿截面圆环向的变化规律

    Figure 3.  Parameter k's variation pattern in circumferential direction

    图 4  应变增量沿截面圆环向的变化规律

    Figure 4.  Strain increment variation pattern in circumferential direction

    图 5  应力分布的理论分析与有限元结果对比

    Figure 5.  Comparison of stress distribution between theoretical analysis and FE results

    图 6  环壳与弯管自由胀形状态下的应力分布

    Figure 6.  Stress distribution of torus and bent tube in free-expansion state

    图 7  典型的弯曲模具结构

    Figure 7.  Typical bending mold structure

    图 8  典型位置沿轴向等效应变分布规律

    Figure 8.  Equivalent strain distribution rule in axial direction at typical location

    图 9  管材弯胀过程中所需内压力及各截面应变增量分布

    Figure 9.  Internal pressure needed during tube bending and expansion process and strain increment distribution at cross-sections of a bent tube

    图 10  弯管胀形典型单元的应变路径

    Figure 10.  Strain paths at different typical points of a pressurized bent tube

    图 11  弯管的自由胀形实验

    Figure 11.  Free-expansion experiment of bent tubes

    图 12  过度弯曲的管材自由胀形过程中的应变路径

    Figure 12.  Strain paths of a bent tube losing most of formability during free expansion process

    图 13  过度弯曲的管材自由胀形过程典型截面上的等效应力和应变增量分布

    Figure 13.  Equivalent stress and strain increment distribution of a bent tube losing most of formability at typical cross-section during free expansion process

    图 14  过度弯曲的管材自由胀形过程实验样件

    Figure 14.  Experimental sample of a bent tube losing most of formability during free expansion process

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出版历程
  • 收稿日期:  2016-06-20
  • 录用日期:  2016-09-21
  • 刊出日期:  2017-07-20

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