Modeling Mechanical Properties of Titanium Scaffolds with Variable Microporosity

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F24%3APU152386" target="_blank" >RIV/00216305:26620/24:PU152386 - isvavai.cz</a>

Výsledek na webu

<a href="https://onlinelibrary.wiley.com/doi/10.1002/adem.202400535" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1002/adem.202400535</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/adem.202400535" target="_blank" >10.1002/adem.202400535</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Modeling Mechanical Properties of Titanium Scaffolds with Variable Microporosity

Popis výsledku v původním jazyce

The article introduces a two-level finite element model for metallic scaffolds with porosity at both design and material levels. Despite several additive manufacturing methods producing structures with controlled hierarchical porosity, their functional properties remain largely unknown, hindering industrial utilization. This article examines how material microporosity affects the mechanical properties of a scaffold prepared by direct ink writing from pure titanium with dimensions typical for orthopedic implants. The study focuses on the compressive response of scaffolds with microporosity ranging from 0.05 to 0.65. The article demonstrates the practical application of the model by estimating the effective Young's modulus and the relative length of the fatigue crack initiation stage. Tensile plastic strains at critical sites exhibit a delocalization from around micropores followed by relocalization into thinning interpore walls with increasing microporosity, resulting in the highest fracture strain predicted for microporosities between 0.2 and 0.3. These strains enable the estimation of the length of the fatigue crack initiation stage, which proves to be very short for all microporosities. This emphasizes the crucial role of the crack growth stage in scaffold fatigue life and confirms the potential for additional experiments on scaffolds with microporosities exceeding 0.15 to enhance their fatigue resistance. The article presents a finite element model for metallic scaffolds, investigating the impact of material microporosity on mechanical behavior. Specifically, the study investigates regular microporous titanium scaffolds prepared by direct ink writing, highlighting the effects of strain delocalization and relocalization on fracture strain. Moreover, the model estimates the relative length of the fatigue crack initiation stage in these materials.image (c) 2024 WILEY-VCH GmbH

Název v anglickém jazyce

Modeling Mechanical Properties of Titanium Scaffolds with Variable Microporosity

Popis výsledku anglicky

The article introduces a two-level finite element model for metallic scaffolds with porosity at both design and material levels. Despite several additive manufacturing methods producing structures with controlled hierarchical porosity, their functional properties remain largely unknown, hindering industrial utilization. This article examines how material microporosity affects the mechanical properties of a scaffold prepared by direct ink writing from pure titanium with dimensions typical for orthopedic implants. The study focuses on the compressive response of scaffolds with microporosity ranging from 0.05 to 0.65. The article demonstrates the practical application of the model by estimating the effective Young's modulus and the relative length of the fatigue crack initiation stage. Tensile plastic strains at critical sites exhibit a delocalization from around micropores followed by relocalization into thinning interpore walls with increasing microporosity, resulting in the highest fracture strain predicted for microporosities between 0.2 and 0.3. These strains enable the estimation of the length of the fatigue crack initiation stage, which proves to be very short for all microporosities. This emphasizes the crucial role of the crack growth stage in scaffold fatigue life and confirms the potential for additional experiments on scaffolds with microporosities exceeding 0.15 to enhance their fatigue resistance. The article presents a finite element model for metallic scaffolds, investigating the impact of material microporosity on mechanical behavior. Specifically, the study investigates regular microporous titanium scaffolds prepared by direct ink writing, highlighting the effects of strain delocalization and relocalization on fracture strain. Moreover, the model estimates the relative length of the fatigue crack initiation stage in these materials.image (c) 2024 WILEY-VCH GmbH

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20500 - Materials engineering

Projekt

<a href="/cs/project/GA23-07879S" target="_blank" >GA23-07879S: Výzkum vlivu nitridace na únavové chování aditivně vyrobených titanových hierarchických porézních struktur</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Advanced Engineering Materials

ISSN

1438-1656

e-ISSN

1527-2648

Svazek periodika

26

Číslo periodika v rámci svazku

19

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

8

Strana od-do

1-8

Kód UT WoS článku

001270903300001

EID výsledku v databázi Scopus

2-s2.0-85198725029