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摘要：
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针对大口径薄壁小弯曲半径管件在航空航天领域日益迫切的需求,在对数控弯曲过程的实验和理论分析基础上,选用动态显式有限元平台ABAQUS/Explicit,以50mm×1mm(外径×壁厚)系列不锈钢和铝合金大口径薄壁小弯曲半径管件为例,实现了包括弯管、抽芯、卸模回弹的完整的数控弯曲有限元模型的建立,结合实验研究对比讨论了大口径小弯曲半径管件弯曲过程建模的难点和解决方法。
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With the increasingly insistent demand for the thin-wall tube with large diameter and small bending radius in the field of aerospace industry,a whole 3D explicit FEM model of the bending process including bending,retracting and unloading(springback) has been established based on the experiment and analytical research with the dynamic explicit FEM code ABAQUS/Explicit.In the modeling,the bending process for 50mm×1mm(out diameter×wall thickness) series of stainless and aluminum tubes are considered.Then combined with the experimental comparison,the difficulty faced with in FE modeling and the corresponding resolving method are discussed.
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基金项目：
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国家杰出青年科学基金(50225518);;
国家自然科学基金(59975016、50175092);;
高等学校优秀青年教师教学科研奖励计划与高校博士点基金(20020699002);;
航空科学基金资助项目(04H53057)
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作者简介：
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参考文献：
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[1]杨合,孙志超,林艳,等.面向21世纪的先进塑性加工技术与管成形研究发展[J].塑性工程学报,2001,8(2):86 88.
[2]Trana Kristoffer.Finite element simulation of the tube hydro-forming processs-bending,performing and hydroforming[J].Journal of Materials Processing Technology,2002,127(3):401 408.
[3]Yang H,Lin Y.Wrinkling analysis for forming limit of tubebending processes[J].Journal of Materials Processing Tech-nology,2005,152(3):363 369.
[4]Li H,Yang H,Zhan M,et al.Wrinkling limit based on FEM vir-tual experiment during NC bending process of thin-walled tube[J].Materials Science Forum,2004,471 472:498 502.
[5]Information on http://www.bendtooling.com/bending_for-mulas.htm.
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