In defined as unit cells are translated

In nature, a lot of materials that contain lattice structure design. The materials are lightweight structures. Natural tabular structures often have honey- comb like or foam like core, that can increase the resistance of the shell to local buckling failure and supports denser outer cylindrical shell (Gibson,2005). To form lightweight high strength materials, the configurations of lattice structure can refer from the materials. Hexagonal lattice structure are one of example that have some similarities with cellular structure of the wood. The behavior such as stiffness and strength of a species wood depends on its density and applied load. If applied load same direction with the wood, the stiffness and strength will higher compared if the applied load across the wood. Another example is the trabecular bone. The structure of the bone is adapted to the loads applied to it. It grows in response to the magnitude and direction of the load applied (Gibson, 2005). There are two categories divided for architectured materials which is stochastic and periodic structures. For a materials that can characterized by a unit cell that can be translated through the structure are known as periodic materials (Wadley, 2002). Cellular materials that cannot be defined by a single unit cell area are referred to as stochastic foams. Periodic cellular structures are divided into two types. First, periodic materials defined as unit cells are translated into two dimensions are known as prismatic cellular materials (Wadley, 2002). The second type, are periodic materials which have 3D periodictivity. The units cells are translated along three axis and these structures referred to lattice materials (Wadley,2002).

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