Fracture Surface Roughness of Ti-Scaffold Filaments with Different Microporosity

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F25%3A00643881" target="_blank" >RIV/68081723:_____/25:00643881 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.prostr.2025.10.031" target="_blank" >http://dx.doi.org/10.1016/j.prostr.2025.10.031</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.prostr.2025.10.031" target="_blank" >10.1016/j.prostr.2025.10.031</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Fracture Surface Roughness of Ti-Scaffold Filaments with Different Microporosity

Popis výsledku v původním jazyce

Scaffolds are 3D metallic porous structures produced by additive manufacturing that find applications in biomedicine as the bone implants. The previous research has shown that the titanium scaffolds with porous filaments (14% microporosity) exhibited better fatigue resistance than those with compact filaments (6% microporosity). This was primarily attributed to fatigue crack growth shielding mechanisms induced by crack-pore interactions and by an extension of fatigue crack path in the porous filaments. A quantification of these effects demands a determination of fracture surface roughness parameters of both types of filaments, which is the main aim of this article. Selected roughness parameters S <inf>a</inf> (arithmetical mean height), S <inf>v</inf> (maximum valley depth) and S<inf>dr</inf> (developed interfacial area ratio) of fracture surfaces of scaffold filaments after cyclic three-point bending tests were determined using the confocal laser microscope Olympus LEXT™ OLS5100 according to ISO 25178. Each sample was subjected to 7 measurements on small surfaces of size 4500 µm² spread over the fatigue fracture surface and the average value with the standard deviation was computed. All the average values of roughness parameters for the porous samples were found to be higher than those for the compound fibers. These parameters decreased with an increasing number of cycles to fracture N <inf>f</inf> in the range N <inf>f</inf> ϵ (10², 10⁵). The statistical analysis of fracture surface roughness will serve as a benchmark for a currently developed model of the fatigue crack growth in metallic materials of variable porosity which will improve our understanding the mechanistic response of scaffolds and enable the optimization of their microporosity.

Název v anglickém jazyce

Fracture Surface Roughness of Ti-Scaffold Filaments with Different Microporosity

Popis výsledku anglicky

Scaffolds are 3D metallic porous structures produced by additive manufacturing that find applications in biomedicine as the bone implants. The previous research has shown that the titanium scaffolds with porous filaments (14% microporosity) exhibited better fatigue resistance than those with compact filaments (6% microporosity). This was primarily attributed to fatigue crack growth shielding mechanisms induced by crack-pore interactions and by an extension of fatigue crack path in the porous filaments. A quantification of these effects demands a determination of fracture surface roughness parameters of both types of filaments, which is the main aim of this article. Selected roughness parameters S <inf>a</inf> (arithmetical mean height), S <inf>v</inf> (maximum valley depth) and S<inf>dr</inf> (developed interfacial area ratio) of fracture surfaces of scaffold filaments after cyclic three-point bending tests were determined using the confocal laser microscope Olympus LEXT™ OLS5100 according to ISO 25178. Each sample was subjected to 7 measurements on small surfaces of size 4500 µm² spread over the fatigue fracture surface and the average value with the standard deviation was computed. All the average values of roughness parameters for the porous samples were found to be higher than those for the compound fibers. These parameters decreased with an increasing number of cycles to fracture N <inf>f</inf> in the range N <inf>f</inf> ϵ (10², 10⁵). The statistical analysis of fracture surface roughness will serve as a benchmark for a currently developed model of the fatigue crack growth in metallic materials of variable porosity which will improve our understanding the mechanistic response of scaffolds and enable the optimization of their microporosity.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název statě ve sborníku

Procedia Structural Integrity

ISBN

—

ISSN

2452-3216

e-ISSN

—

Počet stran výsledku

6

Strana od-do

"Roč. 74 (2025)"

Název nakladatele

Elsevier B.V.

Místo vydání

Amsterdam

Místo konání akce

Brno

Datum konání akce

23. 6. 2025

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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