PSI - Issue 80

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2025) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia

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Procedia Structural Integrity 80 (2026) 169–176

Fracture, Damage and Structural Health Monitoring Modelling Fatigue Crack Growth in Porous Metals Pavel Šandera a , Marta Kianicová b , Karel Slámečka a,c,d , Jana Horníková a *, Michal Kotoul a,b , Jaroslav Pokluda a,b,c a Faculty of Mechanical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czechia b Faculty of Special Technology, Alexander Dubček University of Trenčín, Ku kyselke 469, 911 06 Trenčín, Slovakia c Central European Institute of Technology, Brno University of Technology, Purkyňova 123, 612 00 Brno, Czechia d Institute of Physics of Materials ASCR v.v.i, Žižkova 22, 616 00 Brno, Czechia

© 2025 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 Ferri Aliabadi Abstract Scaffolds are advanced 3D metallic porous structures produced by additive manufacturing that find applications in biomedicine as bone implants. Our previous research has shown that the titanium scaffolds with porous filaments (14 % porosity) exhibited markedly better fatigue resistance than those with compact filaments (5 % porosity). This article presents a first version of the model of fatigue crack growth in porous metallic materials which should reflect the difference between the crack paths in porous and compact filaments and provide an interpretation of their fatigue resistance, particularly based on computed parameters S dr (the developed interfacial area ratio) and R L (the crack path length). S dr -values for the porous material were found to be distinctly higher than those for the compact material, thus indicating higher shielding effects and higher fatigue life of porous filaments compared to the compact ones. The values of S dr previously measured on fracture surfaces of several scaffold filaments fractured under cyclic compression tests correspond well to those predicted by the model. R L -values determined for the porous material are also significantly higher than those computed for the compact material. The calculated values of R L and S dr nearly follow the well known approximative formula connecting these parameters. © 202 5 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 Professor Ferri Aliabadi Keywords: porous metal, fatigue, crack-pore interaction, surface roughness, fracture morphology.

* Corresponding author. Tel.: +420 541 142 866 E-mail address: hornikova@fme.vutbr.cz

2452-3216 © 202 5 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 Professor Ferri Aliabadi

2452-3216 © 2025 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 Ferri Aliabadi 10.1016/j.prostr.2026.02.016