Mechanical Characteristics of Superimposed 316L Lattice Structures under Static and Dynamic Loading

Abstract

Additive Manufacturing (AM) discrete patterns made of stainless steel 316 L offer potential energy absorption for engineering applications, including blast and impact protection systems and aircraft structure. Herein, three different superimposed stainless steel 316 L lattice structures varying rod diameter are manufactured by selective laser melting (SLM). Compression experiments and split Hopkinson pressure bar (SHPB) tests are conducted to determine the quasi‐static and impact behavior of different lattice structures for the strain rate from 10−3 to 1000 s−1. The compressive response, strain rate dependency, and energy absorption capacity of the lattice structures are mechanically characterized. In addition, numerical simulations are conducted to complement the experimental work in which the deformation modes of the lattice under mechanical responses have been studied. The results indicate that vertical truss in structure plays a bearing role in the whole process of compression, which is better than inclined truss structures. Due to the combined effect of two deformation modes in the superimposed structure, it has shown superior energy absorption capacity compared with other structures. The superiority of the superimposed structure provides a new idea for the design of lattice structure.

Spatial Array Configuration Effect of Body‐Centered Cubic Lattice Structures with Finite Unit Cells

“…To compare with the results in Section 3.1.2, n z ¼ 3 is substituted into Equation (9). The final expression is given as follows…”

“…[5][6][7][8] Periodic lattice structures have been studied extensively in engineering applications, because they can offer superior performance such as high stiffness-to-weight and excellent energy absorption than foam structures comprised of plates. [9][10][11][12] A number of previous studies have investigated the mechanical properties of octet, [13] diamond, [14] BCC, [15] and pyramidal [16] lattice structures using theoretical, numerical, and experimental techniques during the past decades.…”

Improved mechanical performance of quasi-cubic lattice metamaterials with asymmetric joints

“…Modern 3d-printing technologies allow to produce the lattice metamaterials with complex geometry of the unit cells that provides their unique mechanical properties such as the ultra-high and tailorable specific stiffness and strength 5,6 , high impact strength [7][8][9] and wide band gaps in the dynamic response [10][11][12] , negative Poisson's ratio, thermal expansion or stiffness [13][14][15] , pronounced non-classical Cosserat-type and Mindlin-type macroscale behavoir [16][17][18][19] , etc. The design of the unit cells in the lattice structures are usually defines the position, size and orientation of the struts to provide some desired topology and related macroscopic response such that the stretch-dominated behavior [20][21][22] , the quasi-isotropic averaged properties 23,24 , the prescribed anisotropy and the symmetric groups 25,26 or the functionally graded structure 27,28 .…”

Study of Energy Absorption Characteristics and Deformation Mechanism of Stretching–Bending Synergistic Lattices Under Dynamic Compression

“…Compared with the traditional OCT and RD, the hybrid lattice cell showed superior energy absorption characteristics for the quasi‐static and dynamic compression tests. Chang et al [ 24 ] designed the hybrid lattice cell by mixing the simple cubic and regular tetrahedron cubic cells. The simulation results showed that the hybrid lattice cell possessed a higher SEA value than that of the basic unit lattice cell.…”