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内高压成形矩形断面圆角应力分析
引用本文:刘钢,苑世剑,滕步刚.内高压成形矩形断面圆角应力分析[J].机械工程学报,2006,42(6):150-155.
作者姓名:刘钢  苑世剑  滕步刚
作者单位:哈尔滨工业大学材料科学与工程学院,哈尔滨,150001;哈尔滨工业大学材料科学与工程学院,哈尔滨,150001;哈尔滨工业大学材料科学与工程学院,哈尔滨,150001
摘    要:采用力学分析和数值模拟方法对圆角部位在内高压成形过程中的应力分布和变形机理进行分析,揭示出圆角和直边过渡区的减薄以及开裂的力学机理。提出内高压成形中圆角和直边的过渡区材料最易满足塑性屈服条件, 并发生厚度方向的压缩应变,因此在过渡区易发生剧烈的减薄变形;并且当管材壁厚与圆角半径的比值大于0.5 时,直边区和圆角区的屈服条件差别较大,引起变形不均匀性增大,更易导致过渡区的过度减薄和开裂。分析结果有助于指导内高压成形零件设计和工艺设计,改善矩形断面零件内高压成形件产品质量。

关 键 词:内高压成形  过渡圆角成形  轻量化构件  局部减薄  开裂
修稿时间:2005年7月4日

STRESS ANALYSIS ON CORNER OF RECTANGULAR SECTION IN TUBE HYDROFORMING
LIU Gang,YUAN Shijian,TENG Bugang.STRESS ANALYSIS ON CORNER OF RECTANGULAR SECTION IN TUBE HYDROFORMING[J].Chinese Journal of Mechanical Engineering,2006,42(6):150-155.
Authors:LIU Gang  YUAN Shijian  TENG Bugang
Abstract:The stress distribution and deformation pattern of the comer are analyzed by mechanical analysis and numerical simulation, and then the mechanism of thinning and cracking at the transition region is disclosed. It is presented that the material at the transition region is the easiest region to satisfy plastic yielding conditions and produce thickness compressive strain. Therefore severe thinning deformation is easy to occur at the transition region and when the ratio of wall thickness to corner radius is bigger than 0.5, the difference of yielding conditions between straight side and corner is more significant so that the deformation nonuniformity is increased, and is easier to induce the excessive thinning and cracking. The result is useful for lightweight part design and process design of tube hydroform-ing (internal high pressure forming) to improve product quality.
Keywords:Tube hydroforming Transition corner forming Lightweight component Local thinning Fracture
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