• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2022, Vol. 58 ›› Issue (12): 75-82,92.doi: 10.3901/JME.2022.12.075

• 材料科学与工程 • 上一篇    下一篇

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胞孔孔径对泡沫铝压缩力学性能影响的仿真研究

庄蔚敏, 王恩铭   

  1. 吉林大学汽车仿真与控制国家重点实验室 长春 130022
  • 收稿日期:2021-08-31 修回日期:2022-01-16 出版日期:2022-06-20 发布日期:2022-09-14
  • 通讯作者: 王恩铭(通信作者),男,1997年出生,博士研究生。主要研究方向为车身结构设计与优化,多孔材料和有限元分析。E-mail:wangem19@mails.jlu.edu.cn
  • 作者简介:庄蔚敏,女,1970年出生,博士,教授,博士研究生导师。主要研究方向为车身结构设计与优化,有限元分析和金属成形技术。E-mail:zhuangwm@jlu.edu.cn
  • 基金资助:
    国家自然科学基金(51775227)和吉林省自然科学基金(20210101054JC)资助项目

Simulation Study on the Influence of Pore Size on the Compression Mechanical Properties of Aluminum Foam

ZHUANG Weimin, WANG Enming   

  1. State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022
  • Received:2021-08-31 Revised:2022-01-16 Online:2022-06-20 Published:2022-09-14

摘要: 为研究胞孔孔径对泡沫铝压缩力学性能的影响,使用基于Voronoi模型的ABAQUS泡沫铝建模插件建立了三维实体泡沫铝模型。根据泡沫铝孔隙率关于胞孔数量及平均壁厚的响应面模型,建立了三种孔隙率(90%、80%、70%)下具有不同胞孔孔径的泡沫铝模型。使用ABAQUS有限元仿真软件进行准静态压缩仿真,对比分析了胞孔孔径对泡沫铝压缩力学性能的影响。在考虑胞孔孔径的影响下,对现有泡沫铝单轴压缩刚塑性硬化模型(R-PH模型)进行了修正。结果表明,相同孔隙率下,具有较小胞孔孔径的泡沫铝在压缩过程中各阶段的应力值更大,其单位体积吸能量增大,最大吸能效率降低,吸能能力减弱,致密应变及平台应力增加;在低孔隙率的泡沫铝中,胞孔孔径对泡沫铝平台应力影响显著;考虑胞孔孔径的修正R-PH模型能很好地预测不同孔隙率及胞孔孔径的泡沫铝的压缩力学行为。

关键词: 闭孔泡沫铝, 三维Voronoi模型, 准静态压缩, 胞孔孔径, 本构模型

Abstract: In order to study the influence of pore size on the compression mechanical properties of aluminum foam, ABAQUS aluminum foam modeling plug-in based on Voronoi model is used to build three-dimensional solid foam aluminum models. According to the response surface model of porosity on cell number and average cell wall thickness, foam aluminum models with different pore sizes under porosity (90%, 80%, 70%) are built. Quasi-static compression simulation with ABAQUS finite element simulation software is used to compare and analyze the influence of pore size on the compressive mechanical properties of aluminum foam. The rigid-plastic hardening model (R-PH model) of aluminum foam under uniaxial compression considering the influence of pore size is modified. The results show that with the same porosity, aluminum foam with smaller pore size has greater stress values at each stage during compression, the energy absorption per unit volume increases but the maximum energy absorption efficiency and the energy absorption capacity decrease, the densification strain and the plateau stress increase. Pore size has a significant influence on the plateau stress of aluminum foam with low porosity. The modified R-PH model considering pore size can well predict the compression mechanical behavior of aluminum foam with different porosity and pore size.

Key words: closed cell aluminum foam, three-dimensional Voronoi model, quasi-static compression, pore size, constitutive model

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