Auxetic Lattice Truss Cores Fabricated of LayWood

Structural performance of metallic sandwich beams with hollow truss cores

The article focuses on the structural performance of sandwich beams with hollow truss lattice cores made from a ductile stainless steel. The trusses are arranged in an orthogonal (cross-ply) configuration, in either ±45 (diamond) or 0 /90 (square) orientations with respect to the face sheets. The responses in shear, tension and compression, as well as simply supported and fully clamped bending,...

On the performance of truss panels with Kagom e cores

The performance characteristics of a truss core sandwich panel design based on the 3D Kagom e has been measured and compared with earlier simulations. Panels have been fabricated by investment casting and tested in compression, shear and bending. The isotropic nature of this core design has been confirmed. The superior performance relative to truss designs based on the tetrahedron has been demo...

Hybrid carbon fiber composite lattice truss structures

Lattice truss structures from expanded metal sheet

Metallic lattice truss structures are usually made by perforating a metal sheet with a periodic diamond pattern followed by folding at node rows to create a plate of 3D interconnected trusses. For low relative density lattices, the initial sheet material is inefficiently utilized, and the node area is small raising concerns about node bond robustness under shear or tensile loading. Here, we exp...

Elasto-static micropolar behavior of a chiral auxetic lattice

Auxetic materials expand when stretched, and shrink when compressed. This is the result of a negative Poisson’s ratio n. Isotropic configurations with n 1 have been designed and are expected to provide increased shear stiffness G. This assumes that Young’s modulus and n can be engineered independently. In this article, a micropolarcontinuum model is employed to describe the behavior of a repres...