| Citation: | LI Houzhenqiang, ZHANG Yadong, ZHANG Jinhua, et al. Reconstruction and application of three-dimensional mesoscopic model of aluminum foam based on CT[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(1): 160-168. doi: 10.13700/j.bh.1001-5965.2016.0959(in Chinese)
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In order to obtain a more realistic mesoscopic analysis model of closed-cell aluminum foam, a new methodology for the finite element modeling based on computed tomography (CT) images is presented. First, the optimal threshold between base material and air was developed using Otsu algorithm by analyzing the images obtained from the CT scanning of closed-cell aluminum foam. Then, the mesoscopic finite element model was directly established based on the thought of mapping grid. As a result, the reconstruction of three-dimensional mesoscopic analysis model of metal foams is achieved. Finally, the numerical simulations of quasi-static compression and dynamic test of closed-cell foam are carried out respectively based on the mesoscopic analysis model. The results demonstrate that the internal deformation of closed-cell aluminum foam distributes throughout the whole specimen, which is closely bound up with their 3D structure under quasi-static compression, while it is close to the loading end and remarkably behaves with localization under dynamic compression. The methodology of modeling can describe mesoscopic structure realistically and provide a more detailed simulation analysis on the stress state, deformation and failure of closed-cell aluminum foams under quasi-static and dynamic loading.
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