Researchers in Canada have published the results of their experiments on 3D-printed octet plate lattice structures with tunable absorption properties.
Tunable energy absorption in lattice structures offers significant potential for use in light-weight cell nuclei of energy-absorbing structures. Using structurally graded, multi-material networks, the researchers used plate-based octet unit cells as the basis for their tests to assess their energy-absorbing capabilities during quasistatic compressive loading.
You can see what an octet unit cell looks like in the image below, along with unit cells with various degrees.
Sandwich structures, with lightweight cores attached to face sheets, are commonly used in applications where high flexural stiffness and shock absorption are required. The traditional honeycomb core is a popular choice, but it is susceptible to crushing. The use of octet unit cells with several different geometries can offer a superior solution compared to the traditional honeycomb sandwich panel.
plate thickness
Regarding the effects of unit cell geometry on the lattice, the researchers examined the effects of varying the plate thickness and changing the filament material along the lattice in the direction of the applied compressive force. These alterations created variations in the structure and material composition of plate lattice structures. The study also analyzed the compression stress-strain behavior of these structures, as well as the effects of modifying the geometric parameters of each unit cell.
The unit cells were designed with Solidworks CAD software and printed with an FDM-type printer. The filaments used were different varieties of nylon and nylon composite (with chopped fibers).
Analysis of compression strain and stress behavior revealed a nearly 10% increase in specific energy absorption (SEA) in graded plate thickness designs at higher strains compared to octet arrays. reference. Furthermore, multi-material arrangements significantly altered the start location of structural collapse.
Finite element analysis of the structures was used in the project, and the simulation models showed good agreement with the experimental results. A key finding was the high sensitivity to plate inclination angle, which led to substantial changes in peak stress values and overall SEA control.
These results demonstrate the potential to customize octet lattice designs through additive manufacturing to better suit the expected load and application. By enhancing energy absorption capabilities, lightweight cellular structures can be used in a variety of industries, including automotive, aerospace, and civil engineering, where enhanced energy absorption is critical for safety and performance.
Summary
The study findings highlight the promise of tunable energy absorption in lattice structures for use in lightweight cell nuclei of energy-absorbing structures. Both structurally graded and multi-material lattices were found to offer improvements in deformation. The ability to customize truss structure designs through additive manufacturing further expands the potential applications of these innovative structures.
You can read the full article, titled “3D Printed Octet Plate Lattices for Tunable Energy Absorption”, published in Materials & Design magazine, at this link.
Come and tell us your opinion on our Facebook, Twitterand LinkedIn Pages, and don’t forget to sign up for our weekly Additive Manufacturing newsletter to get the latest stories delivered straight to your inbox.
Leave a Reply