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The multi-scale nature of architectured materials raises the need foradvanced experimental methods suitable for the identification of theireffective properties, especially when their size is finite and they undergoextreme deformations. The present work demonstrates that state-of-the art imageprocessing methods combined with numerical and analytical models provide acomprehensive quantitative description of these solids and their globalbehaviour, including the influence of the boundary conditions, of themanufacturing process, and of geometric and constitutive non-linearities. Tothis end, an adapted multi-scale digital image correlation analysis is used totrack both elongations and rotations of particular features of the unit cell atthe local and global (homogenized) scale of the material. This permits toobserve with unprecedented clarity the strains for various unit cells in thestructure and to detect global deformation patterns and heterogeneities of thehomogenized strain distribution. This method is here demonstrated on elasticsheets undergoing extreme longitudinal and shear deformations. Theseexperimental results are compared to non-linear finite element simulations,which are also used to evaluate the effects of manufacturing imperfections onthe response. A skeletal representation of the architectured solid is thenextracted from the experiments and used to create a purely-kinematictruss-hinge model that can accurately capture its behaviour. The analysisproposed in this work can be extended to guide the design of two-dimensionalarchitectured solids featuring other regular, quasi-regular or graded patterns,and subjected to other types of loads.

Systematic two-scale image analysis of extreme deformations in soft architectured sheets