Abstract
Architectured beam lattice materials whose anisotropy can be tuned by varying the composition of their elementary cell are investigated. As an exemplary prototype of such material architecture, a regular triangular lattice with an elementary cell composed of 12 beams is considered. One out of three possible values of the elastic modulus is assigned to each beam. The structure is fully defined by a vector in the 12D composition‐structure space whose components are given by the elastic modulus values of the beams comprising the elementary cell. The elastic properties of this 2D material are represented by the compliance elasticity tensor with six independent compliance coefficients. Aiming at a specific set of properties thus involves finding the point in the 12D composition‐structure space that corresponds to a given point in the 6D property space. This is a problem of large dimensionality. To solve it, the neural network approach is used. This enables creation of architectured materials with tunable elastic anisotropy. A chiral element combining large twist with additional anisotropy requirements is presented as an example of successful machine‐learning‐based optimization of beam lattices proposed.
Highlights
Architectured beam lattice materials whose anisotropy can be tuned by varying anisotropic response of cells to various mechanical stimuli.[1,2] In engineering the composition of their elementary cell are investigated
Aiming at a specific set of properties involves finding the point in the 12D compositionstructure space that corresponds to a given point in the 6D property space
In the following we show, by considering the case of a regular triangular beam lattice, that this approach offers attractive prospects of developing archimats with controllable and tunable elastic anisotropy
Summary
The main idea behind the proposed beam lattice archimats is that the controllable anisotropy of their properties can be created by manipulating the number and arrangement of beams with different properties for a fixed geometry of the lattice they form. The above-mentioned analysis of Figure 3 shows that the variation of the makeup of the elementary cell of a regular triangle beam lattice can produce materials with different elastic anisotropies. This opens up a possibility of steering mechanical anisotropy through beam lattice design
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