Cell Based Deformation Calculation for Porous Material

This paper deals with the calculation of full-field displacement over a surface of metallic foam. Owing to the failure of traditional displacement measurement method which calculates the correlation of intensity pattern between two regions, we propose a cellular based full field displacement calculation. The nodes are extracted from the cell boundary and nodal displacement is found by a thin plate spline based robust point matching. The proposed approach involves multiple-step image processing including cell region segmentation, cell region matching and nodal matching. As a result, the displacement at a given node can be found. Metallic foam is used for assessing the effectiveness and accuracy of the proposed algorithm. The results show that local displacements around cell boundaries on the surfaces of the specimen can be effectively determined with the proposed method, thus it appears that the method is promising for predicting displacements of complex cellular solids.