軸向變密度鋁泡沫件的動態(tài)和靜態(tài)壓縮實驗與有限元模擬分析
[Abstract]:In this paper, the finite element model of deformation and energy absorption characteristics of large scale aluminum foam with variable density is discussed through dynamic and static compression experiments and simulation analysis. The experimental results of quasi-static compression and impact compression on large aluminum foam samples with variable density show that the compression process of aluminum foams with variable density in thickness direction shows the characteristics of layer by layer yield deformation and integral deformation from low density layer to low density layer. The deformation characteristics of aluminum foam with uniform density are obviously different. In this paper, the delamination variable density variable scale finite element model and the approximate density and uniform finite element model for large aluminum foam samples with variable density are established. The comparison and analysis of the calculated results show that the delamination variable density and variable scale finite element model can simulate the yield deformation characteristics of the actual material layer by layer, and the calculated quasi-static and impact compression deformation and energy absorption characteristics of the samples are in agreement with the experimental results. However, the results based on uniform model can not simulate the deformation characteristics of each layer, which is obviously inconsistent with the experimental results and theoretical characteristics. The element size of the layered variable density and variable scale finite element model will affect the simulation results of the yield deformation characteristics layer by layer. The calculated results of the layered finite element model based on the element scale approaching the cellular scale of the actual aluminum foam materials are in good agreement with the experimental results. These results are of great significance to the application of aluminum foam materials with various structures.
【作者單位】: 清華大學(xué)汽車工程系;
【分類號】:TB383.4;TG146.21
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