PSI - Issue 41

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Author name / Structural Integrity Procedia 00 (2019) 000–000

Fabio Distefano et al. / Procedia Structural Integrity 41 (2022) 470–485 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the MedFract2Guest Editors. Keywords: lattice structures, additive manufacturing, compressive behaviour, SEM analysis, finite element method.

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Nomenclature D

cell diameter strut diameter strut length

t

L A ρ c

face size

unit cell density unit cell volume material density geometry volume relative density

V c ρ m V m E c σ c E m σ m

ρ c/ ρ m

microlattice elastic modulus microlattice compressive strength material elastic modulus material compressive strength yield stress at a reference strain rate

A B σ y ε u σ u n

strain hardening constant strain hardening coefficient

yield strength

true ultimate stress true ultimate strain Young’s modulus Poisson’s ratio

E

ν

σ m ε m

engineering tensile strength

engineering strain at the tensile strength

ε b ε 0 C m

elongation at break

strain rate

strain rate strengthening coefficient thermal softening coefficient

σ MAX σ med TEA SEA F MAX

compressive strength

crush strength

total energy absorbed specific energy absorbed

peak force

1. Introduction One of the goal research in biomechanical field is to design scaffolds, which promote bone regeneration and osteointegration. Unlike many other tissues can regenerate by itself, the bone's ability for self-repair of massive defects can be limited because of deficiencies in blood supply or in the presence of systemic disease (Abbasi et al., 2020). The penetration, proliferation, differentiation and migration abilities of bone-lining cells are affected by the size and geometry of the scaffold's pores (Efraim et al., 2019). Cellular solids are materials with voids deliberately integrated in their structure (Gibson and Ashby, 1988). Among them, microlattice are topologically ordered cellular solids based on one or more repeating unit cells (Zadpoor, 2019),