薄壁钛管剪应力本构参数识别方法

doi:10.7527/S1000-6893.2015.0289

材料工程与机械制造

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薄壁钛管剪应力本构参数识别方法

闫晶^1,2,3, 吴为^1,2,3

1. 塑性成形技术航空科技重点实验室, 北京 100024;
2. 数字化塑性成形技术及装备北京市重点实验室, 北京 100024;
3. 北京航空制造工程研究所, 北京 100024

收稿日期:2015-09-28 修回日期:2015-10-20 出版日期:2016-09-15 发布日期:2015-11-25
通讯作者: 闫晶男, 博士, 高级工程师。主要研究方向: 航空钣金成形过程建模与仿真。 Tel.: 010-85701254 E-mail: yanjing2008win@163.com E-mail:yanjing2008win@163.com
基金资助:
国家自然科学基金（51305415）

Identification method of shear stress constitutive parameters of Ti-alloy thin-walled tube

YAN Jing^1,2,3, WU Wei^1,2,3

1. Aeronautical Key Laboratory for Plastic Forming Technology, Beijing 100024, China;
2. Beijing Key Laboratory of Digital Plastic Forming Technology and Equipment, Beijing 100024, China;
3. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China

Received:2015-09-28 Revised:2015-10-20 Online:2016-09-15 Published:2015-11-25
Supported by:
National Natural Science Foundation of China (51305415)

摘要/Abstract

摘要：

不同温度下的薄壁钛管剪应力本构参数识别，是研究薄壁钛管差温剪切弯曲过程管材塑性变形行为迫切需要解决的关键问题。提出了一种管材剪切测试的方法。将不同温度下薄壁钛管等温剪切测试、剪切测试过程模拟有限元模型、以及基于距离函数的响应面模型相结合，提出了薄壁钛管不同温度下剪应力本构参数逆向识别方法。采用该方法，识别了TA2薄壁钛管剪应力本构参数。同时建立了TA2薄壁钛管差温剪切弯曲过程模拟3维弹塑性热力耦合有限元模型。分别采用剪应力本构参数和单拉应力本构参数模拟弯管实验过程，评估了有限元模型的可靠性。结果表明：对于剪应力本构参数，温度越高，管材的K值和n值将减小，m值呈现波动的趋势。与单拉应力本构参数相比，剪应力本构参数对温度的变化更敏感，且剪应力本构参数值较小。与单拉应力本构参数相比，使用剪应力本构参数的有限元模型精度较高，模拟精度最大提高了60%。

关键词: 薄壁钛管, 本构参数, 剪应力, 参数识别, 有限元

Abstract:

The identification of shear stress constitutive parameters (SSCPs) of Ti-alloy thin-walled tubes (TATTs) at different temperature levels (DTLs) is a key problem for the research of plastic deformation behavior in these tube shear bending processes under differential temperature fields constraints (DTFCs). A tube shear test method is presented. The TATTs isothermal shear test processes under the DTLs, the finite element (FE) models for simulating these test processes and the response surface models based on distance functions have been combined to present a reverse method for identifying these SSCPs of the TATTs under the DTLs. Then, this method is used for identifying the SSCPs of TA2 TATTs. A 3D coupled thermal-mechanical elastic-plastic FE model for simulating these shear bending processes under DTFCs of the TA2 TATTs is established. An experimental bending process is simulated by this FE model using the SSCPs and the uniaixal tension stress constitutive parameters (UTSCPs) respectively, and the reliability of this FE model is estimated. The results reveal that for SSCPs, the larger the temperature, the smaller the values of K and n; the value of m fluctuates;the effects of temperature on the SSCPs are larger than the UTSCPs and the values of the SSCPs are smaller. The computational precision level of the FE model using the SSCPs is larger than the UTSCPs by 60%.

Key words: Ti-alloy thin-walled tube, constitutive parameter, shear stress, parameter identification, finite element

中图分类号:

V261.3

闫晶, 吴为. 薄壁钛管剪应力本构参数识别方法[J]. 航空学报, 2016, 37(9): 2884-2894.

YAN Jing, WU Wei. Identification method of shear stress constitutive parameters of Ti-alloy thin-walled tube[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(9): 2884-2894.

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E-mail：hkxb@buaa.edu.cn

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薄壁钛管剪应力本构参数识别方法

Identification method of shear stress constitutive parameters of Ti-alloy thin-walled tube

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