Fracture toughness of hierarchical hexagonal lattices
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Journal Title
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Insinööritieteiden korkeakoulu |
Master's thesis
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Authors
Date
2022-12-12
Department
Major/Subject
Solid Mechanics
Mcode
Degree programme
Master's Programme in Mechanical Engineering (MEC)
Language
en
Pages
34
Series
Abstract
The enhancement of the hierarchical design for hexagonal lattice in terms of elastic modulus and fracture toughness was investigated by finite element simulations. The finite element models were created by adding triangular lattices to the core of a hex-agonal lattice. Finite element simulations were completed on the models, from which the plots for elastic modulus and fracture toughness of hierarchical design were achieved. The hierarchical hexagonal lattices show enhancement in terms of elastic modulus and fracture toughness compared to non-hierarchical hexagonal lattice. This en-hancement, however, is insufficient to outperform the regular triangular lattice. The results were compared with an existing analytical model for the hierarchical hexagonal lattice from the literature. Although the fitting curve for the data achieved from the analytical model presents the same behaviour as those achieved from the finite element models, significant larger values for both elastic modulus and fracture toughness were observed. One of the reasons being that the assumption made in the analytical model underestimates the mass of the lattice.Description
Supervisor
St-Pierre, LucThesis advisor
Omidi, MiladKeywords
lightweight material, planar lattice, hierarchical structure, hexagonal lattice, fracture toughness, FEA