PSI - Issue 76

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ScienceDirect

Procedia Structural Integrity 76 (2026) 1–2

5th International Symposium on Fatigue Design and Material Defects FDMD 2025 Editorial Matteo Benedetti a *, Stefano Beretta b , Mauro Madia c , Giovanni Meneghetti d a University of Trento , Department of Industrial Engineering , via Sommarive, 38123 Trento, Italy b Politecnico di Milano, Department of Mechanical Engineering, Via La Masa 1, 20156 Milano, Italy c Bundesanstalt für Materialforschung und –prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany d University of Padova Department of Industrial Engineering, Via Venezia 1 35131, Padova, Italy

Abstract

The fatigue strength and service life of structural components are critically influenced by the presence of defects introduced during manufacturing. These material discontinuities—ranging from pores, inclusions, and surface roughness to microstructural inhomogeneities—act as precursors to fatigue damage, promoting early crack initiation at the microstructural scale. Over the past two decades, the concept of defect-tolerant design has emerged as a powerful framework to bridge the gap between traditional stress-life design methods, conservative safety factors, fracture-mechanics-based residual life assessments, and the limitations of non destructive evaluation (NDE) techniques. This approach is particularly relevant in the context of metal additive manufacturing (AM) , where complex defect populations, anisotropic properties, and novel microstructures challenge conventional fatigue assessment methodologies. Following the successful editions of the Fatigue Design and Material Defects (FDMD) Symposium held in Trondheim (2011), Paris (2014), Lecco (2017), and online in 2021, the 5th FDMD Symposium (FDMD5) was held in Trento, Italy, from May 14 to 16, 2025 . The event attracted an international audience of academic researchers, industry professionals, and

* Corresponding author. Tel.: +39-0461-282457; fax: +39-0461-281977. E-mail address: matteo.benedetti@unitn.it

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 the scientific committee of the FDMD 2025 chairpersons 10.1016/j.prostr.2025.12.279