Publication detail

Modeling Mechanical Properties of Titanium Scaffolds with Variable Microporosity

SLÁMEČKA, K. SKALKA, P. POKLUDA, J.

Original Title

Modeling Mechanical Properties of Titanium Scaffolds with Variable Microporosity

Type

journal article in Web of Science

Language

English

Original Abstract

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

Keywords

direct ink writing; finite element modeling; metal fatigue; microporosity; porous metallic materials; titanium scaffolds

Authors

SLÁMEČKA, K.; SKALKA, P.; POKLUDA, J.

Released

1. 10. 2024

Publisher

WILEY-V C H VERLAG GMBH

Location

WEINHEIM

ISBN

1527-2648

Periodical

Advanced Engineering Materials

Year of study

26

Number

19

State

Federal Republic of Germany

Pages from

1

Pages to

8

Pages count

8

URL

https://onlinelibrary.wiley.com/doi/10.1002/adem.202400535

BibTex

@article{BUT189900,
  author="Karel {Slámečka} and Petr {Skalka} and Jaroslav {Pokluda}",
  title="Modeling Mechanical Properties of Titanium Scaffolds with Variable Microporosity",
  journal="Advanced Engineering Materials",
  year="2024",
  volume="26",
  number="19",
  pages="1--8",
  doi="10.1002/adem.202400535",
  issn="1527-2648",
  url="https://onlinelibrary.wiley.com/doi/10.1002/adem.202400535"
}