闭孔泡沫铝的多轴唯象受压本构参数

张健; 赵桂平; 卢天健

doi:10.6052/0459-1879-15-086

闭孔泡沫铝的多轴唯象受压本构参数

1 西安理工大学土木建筑工程学院西北旱区生态水利工程国家重点实验室培育基地, 西安710048
2 西安交通大学航天航空学院机械结构强度与振动国家重点实验室, 西安710049
3 西安交通大学多功能材料与结构教育部重点实验室, 西安710049

基金项目: 国家自然科学基金项目(11372237, 11402197)、国家重大基础研究计划项目(2011CB610305) 和西安理工大学博士科研启动金(118-211401)资助.

详细信息

通讯作者:
赵桂平, 教授, 主要研究方向:泡沫金属的力学性能. E-mail: zhaogp@mail.xjtu.edu.cn

中图分类号: O34
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出版历程
- 收稿日期: 2015-03-16
- 修回日期: 2015-05-05
- 刊出日期: 2015-07-17

MULTIAXIAL PHENOMENOLOGICAL COMPRESSIBLE CONSTITUTIVE PARAMETERS FOR CLOSED-CELL ALUMINUM FOAMS

1 State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, China
2 State key Laboratory for Strength and Vibration of Mechanical Structure, School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, China
3 MOE key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an 710049, China

Funds: The project was supported by the National Natural Science Foundation of China (11372237, 11402197), the National Basic Research Program of China (2011CB610305) and the Doctoral Scientific Research Startup Foundation of Xi'an University of Technology (118-211401).

摘要

摘要: 基于显微计算机断层扫描影像信息, 逆向重建闭孔泡沫铝试件的三维细观有限元模型, 定量研究闭孔泡沫铝在多轴压缩载荷作用下的大变形力学行为. 讨论了泡沫金属唯象弹塑性本构参数的确定方法, 根据计算结果确定了3 个有代表性的泡沫材料本构模型的本构参数, 并验证了这些本构模型在描述多轴压缩应力状态下的精度. 研究表明, 对于单轴压缩, 3 个本构模型的屈服面均有很好的精度;对于静水压缩, 有限元软件"ABAQUS"的可压缩泡沫本构模型屈服面会发生严重偏离, 陈-卢本构模型"屈服面" 略微低估静水压缩的屈服应力, 而体积强化本构模型的屈服面有很好的精度.
- 可压缩本构关系 /
- 三维细观有限元模型 /
- 逆向工程 /
- 显微计算机断层扫描 /
- 多孔金属材料
Abstract: A three-dimensional (3D) finite element model for real closed-cell aluminum foam specimen was constructed by employing the microfocus X-ray CT system, 3D reconstruction program and the commercially mesh generation program. By changing the boundary conditions of the 3D finite element models for real closed-cell aluminum foam specimen, eleven various stress states including uniaxial (sides coupling), hydrostatic and proportional compression loading were applied for analysis. The yield surface parameters of three compressible elasto-plastic constitutive models were obtained from numerical results. In testing hydrostatic compression, the crushable foam model with isotropic hardening in ABAQUS showed very serious deviation, especially at large strain levels. Chen-!-Lu constitutive models lightly underestimated the hydrostatic yield stress. The present volumetric hardening model was seem to give accurate predictions for both uniaxial and hydrostatic compressions.
- compressible constitutive model /
- three-dimensional mesoscopic finite element model /
- reverse engineering /
- micro computed tomography /
- porous metal materials

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