PSI - Issue 83

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 83 (2026) 286–294

© 2026 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 the scientific committee of the ESIAM26 organizers Keywords: Addictive Manufacturing; Stress Intensity Factor Fatigue; J-Integral; TI-6Al-4V; Fatigue; Finite Element Method. Abstract This work studies mechanical fracture parameters, including the Stress Intensity Factor (SIF), J-Integral (JIT), and critical crack length, using a finite element analysis of a three-point bending specimen. The material used is a Ti-6Al-4V alloy produced by additive manufacturing. The influence of mechanical properties, fracture parameters and the manufacturing direction on structural integrity is the focus of this research. The loading conditions were studied, both with and without contact, while accounting for additive manufacturing directions. The mesh-convergence study was also conducted. The simulations were performed for a three dimensional (3D) model. In conclusion, the finite element analysis using the Contour Integral Method is applicable to parts produced by additive manufacturing; however, special attention should be given to the expected direction of crack propagation. The fourth European Conference on the Structural Integrity of Additively Manufactured Materials (ESIAM26) Fatigue Crack Propagation by Finite Elements Analysis of a Ti6Al4V Teresa Morgado a,b,c,d * , Pedro Matos a , João Alves d,e a Instituto Superior de Engenharia de Lisboa, Rua Conselheiro Emidio Navarro, 1, Lisboa 1959-007, Portugal; a46173@alunos.isel.pt; teresa.morgado@isel.com b UNIDEMI - Research & Development Unit in Mechanical and Industrial Engineering, Campus da FCT/NOVA, Caparica 2829-516, & LASI Intelligent Systems Associate Laboratory, Alameda da Universidade de Guimarães, Guimarães 4800, Portugal; teresa.morgado@isel.com c CINAV – Navy Research Center, Alfeite, Almada 2829-516 Portugal; tlrcmm@gmail.com d UNIRE – Unit for Innovation and Research in Engineering, Rua Conselheiro Emidio Navarro, 1, Lisboa 1959-007, Portugal; tmorgado@dem.isel.ipl.pt;teresa.morgado@dem.isel.pt; jfg.alves@campus.fct.unl.pt e DEMI – Department of Mechanical and Industrial Engineering, Campus da FCT/NOVA, Caparica 2829-516, Portugal; jfg.alves@campus.fct.unl.pt

* Corresponding author. Tel.: +351 218 317 152. E-mail address: teresa.morgado@isel.com; tmorgado@dem.isel.ipl.pt;tlrcmm@gmail.com

2452-3216 © 2026 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 the scientific committee of the ESIAM26 organizers 10.1016/j.prostr.2026.07.033