Finite Element Analysis on the Unloading Elastic Modulus of Aluminum Foams by Unit-cell Model

2nd Annual Applied Science and Engineering Conference

工业技术;自然科学

Triawan, F.^1 ; Budiman, B.A.^2,3 ; Juangsa, F.B.^4 ; Prananto, L.A.^5 ; Aziz, M.^6

Department of Transdisciplinary Science and Engineering, School of Environment and Society, Tokyo Institute of Technology, Tokyo, Japan^1

Faculty of Mechanical and Aerospace Engineering, Institut Teknologi Bandung, Bandung, Indonesia^2

National Center for Sustainable Transportation Technology, Institut Teknologi Bandung, Bandung, Indonesia^3

Department of Mechanical Engineering, School of Engineering, Tokyo Institute of Technology, Tokyo, Japan^4

Department of Mechanical Science and Engineering, School of Engineering, Tokyo Institute of Technology, Tokyo, Japan^5

Institute of Innovative Research, Tokyo Institute of Technology, Tokyo, Japan^6

关键词: Accuracy and precision;    Compressive tests;    Deformation Characteristics;    Engineering structures;    Plastic materials;    Structural imperfections;    Uni-axial loading;    Unit cell modeling;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/288/1/012069/pdf
DOI  :  10.1088/1757-899X/288/1/012069

来源: IOP

【 摘 要 】

This paper presents finite element analyses (FEA) on the unloading elastic moduli of aluminum foams under uniaxial loading and bending conditions. The unit-cell model of Gibson and Ashby was utilized in the FEA with elasto-perfectly plastic material. Compression, tension, and bending tests simulations were carried out using Abaqus software. The non-linearity effect caused by structural imperfection/buckling of unit-cell was incorporated. From the compressive test simulation, it was confirmed that the results showed good agreement with the referred experimental data. This means that the developed FE model can be regarded as an RVE model of aluminum foams. Then, the deformation characteristic and elastic modulus obtained from all simulations were compared and examined. As the results, the elastic modulus obtained from bending test demonstrated higher value than that of under uniaxial loads. This discrepancy increases gradually as the relative density decreases. The mechanism responsible for generating the discrepancy in stiffness was discussed. Furthermore, this work points out the necessity of measuring both Young's and flexural moduli for designing an engineering structure using foam materials especially when accuracy and precision are demanded.