Advances in Multiaxial Fatigue and Metallurgical Characterization of Metals

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Failure Analysis".

Deadline for manuscript submissions: closed (30 September 2025) | Viewed by 621

Special Issue Editors

IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
Interests: fatigue testing; multiaxial fatigue; ultrasonic fatigue testing; additive manufacturing; product design
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Guest Editor
Department of Mechanical Engineering, University of Coimbra, 3030-788 Coimbra, Portugal
Interests: fatigue behavior; additive manufacturing; multiaxial fatigue; damage accumulation; notch effect; low-cycle fatigue
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Guest Editor
1. IDMEC, Instituto Superior de Engenharia de Lisboa, Polytechnic University of Lisbon, 1959-007 Lisbon, Portugal
2. Unit for Innovation and Research in Engineering, Polytechnic University of Lisbon, 1959-007 Lisbon, Portugal
Interests: decision-making; energy systems; innovation management; project management; risk management; soft computing; sustainable development
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Special Issue Information

Dear Colleagues,

Understanding multiaxial fatigue in metals is essential for improving the performance, durability, and safety of structural components. While significant progress has been made in developing models to predict fatigue life, the intricate relationship between microstructures, stress states, and environmental influences remains a challenge. This Special Issue aims to bring together the latest research on the fundamental aspects of multiaxial fatigue, metal characterization, and metallurgical phenomena that shape fatigue behavior. We invite original research articles, reviews, and theoretical studies that provide new insights into fatigue damage mechanisms, the role of microstructure in fatigue performance, and advanced characterization techniques. Emphasis will be placed on fatigue behavior across various metallic systems, including ferrous and non-ferrous alloys, transition metals, and advanced metal compounds.

We look forward to your valuable contributions to this important field of research.

Topics of interest include (but are not limited to) the following:

  • Multiaxial fatigue in metals: damage mechanisms, stress–strain analysis, and life prediction models.
  • Microstructural influences on fatigue behavior: grain size effects, phase transformations, and dislocation dynamics.
  • Metallurgical aspects of fatigue: influence of alloying elements, precipitation hardening, and thermomechanical processing.
  • Fatigue performance of ferrous and non-ferrous metals: iron, nickel, aluminum, titanium, and magnesium alloys.
  • Advanced characterization techniques: electron microscopy, X-ray diffraction, and atom probe tomography in fatigue studies.
  • Cyclic deformation and fracture mechanisms: crack initiation, propagation, and fatigue failure analysis.
  • Environmental effects on fatigue: corrosion–fatigue interactions, high-temperature fatigue, and oxidation effects.

This Special Issue will provide a platform for fundamental research that deepens our understanding of multiaxial fatigue and metallurgical science, promoting advancements in metal research across academia and industry.

Dr. Luis Reis
Dr. Ricardo Branco
Prof. Dr. Vitor Anes
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

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Keywords

  • multiaxial fatigue
  • metallurgy
  • microstructure and fatigue
  • ferrous and non-ferrous metals
  • alloy fatigue behavior
  • crack initiation and propagation
  • environmental fatigue effects
  • advanced material characterization

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Published Papers (1 paper)

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Research

19 pages, 4788 KB  
Article
Effect of Hardening Rate on the Bendability and Fracture Response of AA6082 Aluminum Extrusions in the VDA238-100 Tight Radius Bend Test
by Jacqueline Noder, Kenneth Cheong, Cliff Butcher, Paul Rometsch and Warren J. Poole
Metals 2025, 15(11), 1199; https://doi.org/10.3390/met15111199 - 28 Oct 2025
Viewed by 224
Abstract
Understanding the microstructure–property relationship in aluminum extrusions is crucial to leverage their potential in automotive lightweighting. The sensitivity of the processing history to the microstructure and through-thickness variations poses a major challenge since it leads to strong directionality in plasticity and fracture. Reliable [...] Read more.
Understanding the microstructure–property relationship in aluminum extrusions is crucial to leverage their potential in automotive lightweighting. The sensitivity of the processing history to the microstructure and through-thickness variations poses a major challenge since it leads to strong directionality in plasticity and fracture. Reliable characterization of the mechanical response under relevant stress states is crucial for the development of modeling strategies and performance ranking in alloy design. To this end, tensile and 3-point bend tests were performed for an aluminum extrusion produced on a laboratory-scale extrusion press at Rio Tinto Aluminium. Direct measurements of surface strains during bending using stereoscopic digital image correlation revealed that a larger bend angle in the VDA238-100 test does not necessarily imply a higher fracture strain. The T4 sample tested in the extrusion direction sustained a bend angle of 104° compared to 68° in T6 for the same nominal bend severity (ratio of sheet thickness to punch radius), despite comparable major fracture strains of 0.60 and 0.58, respectively. It is proposed that the work-hardening behavior governs the strain distribution on the outer bend surface. The higher hardening rate in the T4 condition helped distribute deformation in the bend zone more uniformly. This delayed fracture to larger bend angles since strain is accumulated at a lower rate. To assess whether the effect of the hardening behavior is manifest at a microstructural lengthscale, microcomputed tomography (μ-CT) scans were conducted on interrupted bend samples. The distribution and severity of damage in the form of cracks on the outer bend surface were distinct to the temper and thus the hardening rate. Full article
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