Author(s): Ribeiro Cardoso Martins Morgado, Teresa Leonor ; Alves, João ; Pereira, António ; Pereira, Manuel ; Martins, Rui F.
Date: 2025
Persistent ID: http://hdl.handle.net/10400.21/21859
Origin: Repositório Científico do Instituto Politécnico de Lisboa
Subject(s): Intrinsic defects; Tomography; Ti-6Al-4V; Additive manufacturing
The present work presents a new approach to studying the structural integrity of a Ti-6Al-4V alloy obtained by Selective Laser Melting (SLM). This approach is based on the intrinsic addictive manufacturing defects analysis obtained by nanotomography, the experimental S-N curve, and the small crack growth Murakami and Endo model. Also, two counting methods of 3D manufacturing intrinsic defects were considered. The simulation of S-N curves and the small crack propagation curves were successfully obtained. New models for predicted fatigue limit were developed, one using the (3D) variable area of the defects observed as the total area and the other using the total project area. The 3D total surface area counting method presents more conservative values on crack propagation studies, so it is recommended for integrity studies of Ti6Al4V alloy obtained by SLM.
