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A new triangular lattice material testing device
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DOI：10.1016/j.ijsolstr.2026.114160.png)
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Abstract
En 中文
A new testing device for triangular (2D), lattice materials is proposed. This lattice belongs to the tensional class of stiff materials with structural applications. The specimen has a triangular shape and has 144 cells. The connection system consists of pivot joints, which are located at the middle of the beams. The device makes use of pantographs, rods, and push bars to impose regular fields at the boundary. It is capable of developing a homogeneous strain field within the specimen, under the Cauchy-Born assumption. Nearly all strain states are accessible with two angular settings, and one force, which is applied by a standard uniaxial testing machine. For now, stress paths are limited to proportional loadings only. Validation tests consists of compression, pure shear and equi-biaxial tests with DIC strain measurement. Under high load, homogeneous local buckling patterns develop that are similar to those predicted by the theory and are not induced by boundary effects.
Keywords:
Lattice material
Testing device
Cauchy-Born hypothesis
Local buckling
All 2D strain directions
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