引入材料参数的弯管中性层偏移解析模型

doi:10.7527/S1000-6893.2015.0110

材料工程与机械制造

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引入材料参数的弯管中性层偏移解析模型

刘碧颖¹, 李恒¹, 李龙¹, 杨合¹, 谷瑞杰²

1. 西北工业大学凝固技术国家重点实验室, 西安 710072;
2. 中国重型机械研究院有限公司, 西安 710032

收稿日期:2015-03-22 修回日期:2015-04-22 出版日期:2016-03-15 发布日期:2015-04-30
通讯作者: 李恒,Tel.:029-88460212-808,E-mail:liheng@nwpu.edu.cn E-mail:liheng@nwpu.edu.cn
作者简介:刘碧颖,女,硕士研究生。主要研究方向:高性能轻量化薄壁构件精确塑性成形。E-mail:liubiyingnwpu@163.com;李恒,男,博士,教授,博士生导师。主要研究方向:高性能轻量化薄壁构件精确塑性成形。Tel:029-88460212-808,E-mail:liheng@nwpu.edu.cn;李龙,男,硕士研究生。主要研究方向:高性能轻量化薄壁构件精确塑性成形。E-mail:1041616749@qq.com;杨合,男,博士,教授,博士生导师。主要研究方向:先进塑性成形技术与计算机仿真。Tel:029-88460212-801,E-mail:yanghe@nwpu.edu.cn;谷瑞杰,男,高级工程师。主要研究方向:先进塑性成形技术与计算机仿真。E-mail:Jackgu0214@163.com
基金资助:
国家自然科学基金面上项目(51275415);国家自然科学基金优秀青年科学基金(51522509)

Analytical model of neutral layer shift in tube bending introducing material parameters

LIU Biying¹, LI Heng¹, LI Long¹, YANG He¹, GU Ruijie²

1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;
2. China National Heavy Machinery Research Institute Co., Ltd, Xi'an 710032, China

Received:2015-03-22 Revised:2015-04-22 Online:2016-03-15 Published:2015-04-30
Supported by:
Nation Natural Science Foundation-Outstanding Youth Foundation(51522509)

摘要/Abstract

摘要：

中性层偏移是表征管材弯曲内外侧不均匀变形程度的关键参数。基于弯管截面力矩平衡条件,建立了引入材料参数的管材弯曲变形中性层偏移解析模型,针对管材数控绕弯和压弯过程对所建模型从多个方面进行了评估,研究了不同几何和材料等管材本征参数下的管材弯曲中性层偏移规律。结果表明:应用于TA18钛管数控绕弯,发现所建解析模型与已有解析方法预测精度相当,但能考虑材料参数影响,且相较于有限元模拟,本文解析模型更接近实验结果;应用于A6063铝合金管和AZ31镁合金管压弯过程,并与Hasegawa解析方法相较,发现本文解析模型能够准确预测拉压不对称对压弯中性层偏移的影响;弯曲半径减小,弯管直径增大,中性层向弯曲内侧移动;拉压屈服强度比减小,厚向异性指数增大,中性层向弯曲内侧移动。

关键词: 弯曲, 中性层偏移, 材料参数, 解析模型, 力矩平衡

Abstract:

Neutral layer shift is the key parameter to feature the degree of unequal bending deformation. Based on the balance of torque, an analytical model for neutral layer shift in tube bending is established by introducing material parameters. The model is assessed from various aspects in rotary draw bending and press bending and the rules of neutral layer shift in tube bending are studied with different geometric and material parameters. The results show that:appling the model to TA18 tube rotary draw bending, it is found that the accuracy of the established model is comparable to that of existing analytical method, but the established model can reflect the influence of material parameters on neutral layer shift and is more closer to the experiment result than finite element method; applied the model to A6063 and AZ31 tube press bending and compared the results with Hasegawa method, it shows that the established model provides better prediction accuracy of neutral layer shift under tension-compression asymmetry; decreasing the bending radius or increasing the bending diameter, the neutral layer shifts inwards; decreasing the ratio of tensile strength to compressive strength or increasing normal anisotropy exponent, the neutral layer also shifts inwards.

Key words: bending, neutral layer shift, material parameters, analytical model, balance of torque

中图分类号:

TG386.3⁺1

刘碧颖, 李恒, 李龙, 杨合, 谷瑞杰. 引入材料参数的弯管中性层偏移解析模型[J]. 航空学报, 2016, 37(3): 1074-1082.

LIU Biying, LI Heng, LI Long, YANG He, GU Ruijie. Analytical model of neutral layer shift in tube bending introducing material parameters[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(3): 1074-1082.

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E-mail：hkxb@buaa.edu.cn

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引入材料参数的弯管中性层偏移解析模型

Analytical model of neutral layer shift in tube bending introducing material parameters

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