E. Y. Chen, D. R. Bice, Transition45 Technologies, Inc., Orange, CA; Q. Li, University of Nevada, Reno, Reno, NV; D. C. Dunand, Northwestern University, Evanston, IL
Lattice block structures (LBS) - also called lattice block materials, lattice-truss structures, truss-core sandwiches, and cellular lattices - are three-dimensional-periodic reticulated materials that derive their outstanding mechanical performance from a high-symmetry arrangement of internal trusses connected at nodes. These engineered materials are innovations that offer tremendous opportunities for weight and cost reduction in future aerospace systems, both for commercial and military applications. In this presentation, the structural and mechanical characterization of individual struts and flat panel LBS produced using an aerospace quality investment casting process are reported for the titanium alloys Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo. Testing in compression, bending, and impact show that high strength, ductility and energy absorption are achieved for both individual struts and full panels. Elevated temperature testing results will also be discussed. Finally, the experimental compressive stress-strain behavior of the LBS panels will be compared to finite element modeling (FEM) predictions. This work was supported by NASA-Glenn Research Center.
Summary: Lattice block structures (LBS) are three-dimensional-periodic reticulated materials that derive their outstanding mechanical performance from a high-symmetry arrangement of internal cells of trusses. These engineered materials are innovations that offer tremendous opportunities for weight and cost reduction in future aerospace systems. This presentation covers the room and elevated temperature structural and mechanical properties of individual struts and flat panel LBS produced using an aerospace quality investment casting process for titanium alloys.
