• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2018, Vol. 54 ›› Issue (22): 78-85.doi: 10.3901/JME.2018.22.078

• 材料科学与工程 • 上一篇    下一篇

考虑成形方向的航空铝合金修正本构模型的构建

孟莹, 付秀丽, 潘永智, 徐念伟   

  1. 济南大学机械工程学院 济南 250022
  • 收稿日期:2018-05-21 修回日期:2018-07-21 出版日期:2018-11-20 发布日期:2018-11-20
  • 通讯作者: 付秀丽(通信作者),女,1978年出生,博士,教授,硕士研究生导师。主要研究方向为高效加工与表面精度控制。E-mail:me_fuxl@ujn.edu.cn
  • 作者简介:孟莹,女,1994年出生。主要研究方向为高效加工航空轻合金的动态力学性能。E-mail:myingjd@163.com
  • 基金资助:
    国家自然科学基金(51675230)和山东省重点研发计划(2018GGX103029)项目资助。

Modified Johnson-Cook Constitutive Model of Aerial Aluminum Alloy 7050-T7415 Considering the Forming Direction Effect

MENG Ying, FU Xiuli, PAN Yongzhi, XU Nianwei   

  1. School of Mechanical Engineering, University of Jinan, Jinan 250022
  • Received:2018-05-21 Revised:2018-07-21 Online:2018-11-20 Published:2018-11-20

摘要: 为了能够准确地反映材料成形方向对其动态力学性能的影响,利用电子万能试验机及分离式霍普金森压杆(SHPB)装置,对航空铝合金7050-T7451板材沿不同成形方向(法向ND,横向TD,轧向RD)取样,并进行准静态加载试验和动态冲击剪切试验。结果表明:成形方向是影响材料准静态和动态力学性能的重要因素之一,在动态冲击剪切过程中,铝合金7050-T7451表现出一定的应变率敏感性和正应变率强化效应。基于材料的成形方向影响规律,构建包含应变率敏感函数项的修正的Johnson-Cook本构模型,并对比验证修正模型与试验数据的结果,证明了修正的、包含应变率函数项的材料本构模型更适用于描述不同成形方向下的材料动态力学性能,该模型能够为建立精确可靠的各向异性材料仿真模型提供数据支持。

关键词: 本构模型, 成形方向, 动态冲击剪切, 航空铝合金7050-T7451

Abstract: In order to accurately reflect the influence of the forming direction of materials on its dynamic mechanical properties, Quasi-static and dynamic impact shear tests of aerial aluminum alloy 7050-T7451 with different forming directions (rolling direction RD, transverse direction TD and normal direction ND) are performed by electronic universal testing machine and Split Hopkinson Pressure Bar (SHPB). The results show that the forming directions is one of the important factors that affect the quasi-static and dynamic mechanical properties of material. And the material has a certain strain rate sensitivity and positive strain rate strengthening effect in the process of dynamic impact shear. Based on the influence of the forming direction of the material, the modified Johnson-Cook constitutive model based on the strain rate sensitivity item is constructed. The comparison of the results of the modified constitutive model and experimental data proves that the modified constitutive model considering the strain rate sensitivity is more suitable for dynamic mechanical properties of the material under different forming directions. The model can provide data support for establishing accurate and reliable simulation models of anisotropic materials.

Key words: aerial aluminum alloy 7050-T7451, constitutive model, dynamic impact shear, forming direction

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