Abstract
Compression behavior of porous aluminum was examined by the experiment, elastic and elastic-plastic finite element analyses. The finite element model was constructed by the image-based modeling technique using the three-dimensional images obtained by the micro-focus X-ray computed tomography. Use was made of the voxel meshing which convert a voxel into a cubic finite element for simplicity. The elastic analysis showed that the elastic stress concentration was extremely high and occurred around the junction of cell walls, while the evaluated stiffness was extremely higher than the experimental result. Moreover, the post stress-smoothing filter worked effectively to reduce the error stress arising from the step-like surface shape of the voxel model. The elastic-plastic analysis showed that the actual stress concentration was relatively low and the experimental initial stiffness must be affected by the plastic deformation.
