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3Dhotbed: Harnessing 3D Technologies and Data to Teach the History of the Book

Description: Presentation at the 2017 Texas Conference on Digital Libraries. This presentation includes the case study of developing 3D models of the tools, hosting the resulting data in the digital library, and the pedagogical opportunities the project has afforded.
Date: May 24, 2017
Creator: McIntosh, Marcia; Jacobs, Courtney E. & O'Sullivan, Kevin
Partner: UNT Libraries

Loading Mode Dependent Effective Properties of Octet-truss Lattice Structures Using 3D-Printing

Description: Cellular materials, often called lattice materials, are increasingly receiving attention for their ultralight structures with high specific strength, excellent impact absorption, acoustic insulation, heat dissipation media and compact heat exchangers. In alignment with emerging additive manufacturing (AM) technology, realization of the structural applications of the lattice materials appears to be becoming faster. Considering the direction dependent material properties of the products with AM, by directionally dependent printing resolution, effective moduli of lattice structures appear to be directionally dependent. In this paper, a constitutive model of a lattice structure, which is an octet-truss with a base material having an orthotropic material property considering AM is developed. In a case study, polyjet based 3D printing material having an orthotropic property with a 9% difference in the principal direction provides difference in the axial and shear moduli in the octet-truss by 2.3 and 4.6%. Experimental validation for the effective properties of a 3D printed octet-truss is done for uniaxial tension and compression test. The theoretical value based on the micro-buckling of truss member are used to estimate the failure strength. Modulus value appears a little overestimate compared with the experiment. Finite element (FE) simulations for uniaxial compression and tension of octet-truss lattice materials are conducted. New effective properties for the octet-truss lattice structure are developed considering the observed behavior of the octet-truss structure under macroscopic compression and tension trough simulations.
Date: May 2015
Creator: Challapalli, Adithya
Partner: UNT Libraries