Dynamic and static compression tests and FEA analyses of aluminum foam specimen with variable density in the loading direction

doi:10.16511/j.cnki.qhdxxb.2017.25.033

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Journal of Tsinghua University(Science and Technology) ›› 2017, Vol. 57 ›› Issue (7) : 753-762. DOI: 10.16511/j.cnki.qhdxxb.2017.25.033

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Dynamic and static compression tests and FEA analyses of aluminum foam specimen with variable density in the loading direction

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Abstract

Closed-cell aluminum foams with variable densities in the loading direction are widely used. A finite-element mode (FEM) is used to model the foam deformation and energy absorption characteristics with dynamic and quasi-static compression tests. The results show that large aluminum foam specimens with variable densities have density-dependent layered deformation characteristics, which differ from uniform-density aluminum foams. Predictions of an FEM model with a layered variable density and layered element sizes are compared with those of a conventional FEA model with uniform density and element size. The computation results show that the layered gradual deformation characteristics can be simulated by the layered models with quasi-static and dynamic compression simulation results agreeing well with experimental data. The uniform model cannot accurately predict the layered gradual deformation characteristics. The element size of the layered models influences the simulated layered gradual deformation characteristics with simulation results using the layered model with element sizes equal to the foam cell diameter agreeing best with the experimental data. These results will improve engineering designs using aluminum foam materials.

Key words

aluminum foam with variable density / dynamic compressional mechanical characteristics / FE model with layered variable density and element size / layered gradual deformation and energy absorption characteristics

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LÜ Zhenhua, SUN Jingxuan. Dynamic and static compression tests and FEA analyses of aluminum foam specimen with variable density in the loading direction[J]. Journal of Tsinghua University(Science and Technology). 2017, 57(7): 753-762 https://doi.org/10.16511/j.cnki.qhdxxb.2017.25.033

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