PSI - Issue 68

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

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Procedia Structural Integrity 68 (2025) 1166–1172

European Conference on Fracture 2024 Investigating Fracture Behaviour of Single-Cell Lattice Materials via XFEM: Voxel-based Approach Bahman Paygozar*, Recep M. Gorguluarslan Department of Mechanical Engineering, TOBB University of Economics and Technology, Ankara 06560, Turkey Abstract This study uses the extended finite element method (XFEM) and voxel-based approach to numerically investigate additively manufactured single-cell lattice materials' fracture behavior (e.g., crack growth and fracture resistance) under tensile loading. Body centered cubic (BCC) single-cell lattices were manufactured from Polylactic acid (PLA) with a strut diameter of 1.5 mm using the fused filament fabrication (FFF) technique. The micro-CT imaging was utilized to provide detailed information on defects (e.g., voids, gaps, and cracks) inside the lattices, improving the exactness of the models used in the numerical investigations. The 2D micro-CT images were then converted to 3D voxel models through MATLAB programming. The generated models were numerically analyzed using the XFEM technique, in which the crack initiation and propagation were modeled via maximum principal stress (MaxPS) and power-law fracture criteria, respectively. A comparison was made between the results of XFEM analyses obtained from the single-cell solid and voxel BCC lattice models. © 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 ECF24 organizers European Conference on Fracture 2024 Investigating Fracture Behaviour of Single-Cell Lattice Materials via XFEM: Voxel-based Approach Bahman Paygozar*, Recep M. Gorguluarslan Department of Mechanical Engineering, TOBB University of Economics and Technology, Ankara 06560, Turkey Abstract This study uses the extended finite element method (XFEM) and voxel-based approach to numerically investigate additively manufactured single-cell lattice materials' fracture behavior (e.g., crack growth and fracture resistance) under tensile loading. Body centered cubic (BCC) single-cell lattices were manufactured from Polylactic acid (PLA) with a strut diameter of 1.5 mm using the fused filament fabrication (FFF) technique. The micro-CT imaging was utilized to provide detailed information on defects (e.g., voids, gaps, and cracks) inside the lattices, improving the exactness of the models used in the numerical investigations. The 2D micro-CT images were then converted to 3D voxel models through MATLAB programming. The generated models were numerically analyzed using the XFEM technique, in which the crack initiation and propagation were modeled via maximum principal stress (MaxPS) and power-law fracture criteria, respectively. A comparison was made between the results of XFEM analyses obtained from the single-cell solid and voxel BCC lattice models. © 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 ECF24 organizers © 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 ECF24 organizers

Keywords: Additive manufacturing; voxel model; XFEM; crack propagation. Keywords: Additive manufacturing; voxel model; XFEM; crack propagation.

* Corresponding author. Tel.: +90-312-292-4000; fax: +90-312-292-4091. E-mail address: bpaygozar@etu.edu.tr * Corresponding author. Tel.: +90-312-292-4000; fax: +90-312-292-4091. E-mail address: bpaygozar@etu.edu.tr

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 ECF24 organizers 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 ECF24 organizers

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 ECF24 organizers 10.1016/j.prostr.2025.06.183