Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2024
Thesis Language: Turkish
Student: Atakan ERATA
Supervisor: Gökhan Küçüktürk
Abstract:
Metal lattice structures are notable for their superior mechanical properties, such as high functionality, specific strength, and customizable mechanical characteristics. Their use as energy absorbers is significant in the aerospace, automotive, and biomedical sectors. Lattice structures offer an ideal framework for customizing the propagation of shock waves and absorption of impact energy. This study aims to investigate the impact of different lattice structures on their energy absorption capabilities by conducting high-impact analyses using finite element software. Within this study, high-impact velocity was applied to lattice structures to examine their energy absorption capabilities. Additionally, parameters influencing the energy absorption capabilities of lattice structures were investigated. Within this study's scope, uniform and graded lattice structures were designed for each lattice type. The lattice structures were designed using the Ntopology software. Four lattice types were designed using existing unit cell structures (BCC, Fluorite, Kelvin Cell, and Truncated Octahedron) from the Ntopology library while a special lattice structure was designed using Solidworks and Ntopology. Explicit analyses were conducted in Ansys under the same boundary conditions for all designs. AlSi10Mg was selected as the material, and the Johnson-Cook material model was used to account for the material's sensitivity to deformation rate during high-speed collisions. As a result of this study, the energy absorption capabilities and the force values resulting from the collisions of lattice structures subjected to high-speed impacts were examined. It was observed that different types of lattice structures with the same relative density and external dimensions exhibited different responses and energy absorption results during high-impact loads.
Key Words : Lattice structures, energy absorption, impact analysis, AlSi10Mg, additive manufacturing