Computational Technology Resources - CCC

S. Gholibeygi¹, H. Ergün² and B. Ayhan²

¹Graduate School, Civil Engineering Department, Structural Engineering PhD Program, Istanbul Technical University, Turkey
²Mechanics Division, Civil Engineering Department, Civil Engineering Faculty, Istanbul Technical University, Turkey

doi:10.4203/ccc.9.10.1

S. Gholibeygi, H. Ergün, B. Ayhan, "Investigation of Beam Finite Element Models of Octet-Truss Unit Cell Using Homogenization", in P. Iványi, J. Kruis, B.H.V. Topping, (Editors), "Proceedings of the Fifteenth International Conference on Computational Structures Technology", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 9, Paper 10.1, 2024, doi:10.4203/ccc.9.10.1

Keywords: homogenization, average stress method, lattice material, octet truss unit cell, beam finite element simulation, shear stiffness.

Abstract

This study investigates the beam model accuracy of octet-truss lattice solid cell in the calculation of homogenized material properties using the average stress method with Ansys finite element program for a range of relative density 0.01-0.5. While alignment is observed at lower relative densities (less than 0.1), the beam model underestimates results at higher densities, revealing reductions in elastic and shear modulus values. The study critically examines existing beam model modifications in literature, traditionally centred on increasing strut stiffness at joint regions, particularly for lattice materials under compression testing. The studies found in the literature ultimately produced multiple parameter pairs by considering only the modulus of elasticity. The procedure for determining these parameters is graphically illustrated in detail considering also the shear modulus and it is concluded that both modulus values could not be fit to the solid model results with this type of modification. Closed expressions for the moduli of octet-truss lattice material are presented to be used for the relative density range higher than 0.1, to keep the error under ten percent.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 9 PROCEEDINGS OF THE FIFTEENTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: P. Iványi, J. Kruis and B.H.V. Topping Paper 10.1 Investigation of Beam Finite Element Models of Octet-Truss Unit Cell Using Homogenization S. Gholibeygi¹, H. Ergün² and B. Ayhan² ¹Graduate School, Civil Engineering Department, Structural Engineering PhD Program, Istanbul Technical University, Turkey ²Mechanics Division, Civil Engineering Department, Civil Engineering Faculty, Istanbul Technical University, Turkey doi:10.4203/ccc.9.10.1 Full Bibliographic Reference for this paper S. Gholibeygi, H. Ergün, B. Ayhan, "Investigation of Beam Finite Element Models of Octet-Truss Unit Cell Using Homogenization", in P. Iványi, J. Kruis, B.H.V. Topping, (Editors), "Proceedings of the Fifteenth International Conference on Computational Structures Technology", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 9, Paper 10.1, 2024, doi:10.4203/ccc.9.10.1 Keywords: homogenization, average stress method, lattice material, octet truss unit cell, beam finite element simulation, shear stiffness. Abstract This study investigates the beam model accuracy of octet-truss lattice solid cell in the calculation of homogenized material properties using the average stress method with Ansys finite element program for a range of relative density 0.01-0.5. While alignment is observed at lower relative densities (less than 0.1), the beam model underestimates results at higher densities, revealing reductions in elastic and shear modulus values. The study critically examines existing beam model modifications in literature, traditionally centred on increasing strut stiffness at joint regions, particularly for lattice materials under compression testing. The studies found in the literature ultimately produced multiple parameter pairs by considering only the modulus of elasticity. The procedure for determining these parameters is graphically illustrated in detail considering also the shear modulus and it is concluded that both modulus values could not be fit to the solid model results with this type of modification. Closed expressions for the moduli of octet-truss lattice material are presented to be used for the relative density range higher than 0.1, to keep the error under ten percent. download the full-text of this paper (PDF, 11 pages, 754 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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