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Metals
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Mechanical Properties, Fatigue and Fracture of Metallic Materials
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Mechanical Properties, Fatigue and Fracture of Metallic Materials

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

Deadline for manuscript submissions: 10 August 2025 | Viewed by 5100

Special Issue Editor

Dr. Gbadebo Moses Owolabi

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Howard University, Washington, DC 20059, USA
Interests: fatigue; fracture mechanics; multiscale modeling and simulations; constitutive modeling & finite element applications; additive manufacturing; high strain rate testing and materials characterization; structural health monitoring
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Metals and metallic alloys are the most widely used materials for mechanical components. It is widely accepted that fatigue is the most common failure mode of structural components. Losses due to fatigue failures annually are over several millions to billions of dollars. Apart from these economic losses, fatigue failures are also responsible for causing major safety concerns due to the rapid and often undetectable nature of the final components’ fracture.

This Special Issue will bring together papers focusing on various aspects of the mechanical properties, fatigue and fracture of metals and metallic alloys to facilitate the dissemination of recent advances in the field. We welcome papers relating to all aspects of the mechanical properties, fatigue and fracture behavior of metals and alloys, including, but not limited to, the following topics: novel experimental testing and numerical methods to characterize fatigue crack formation and multistage growth; mechanisms and growth of fatigue cracks from defects; new multiaxial fatigue life prediction methodologies; new methods for notch root analysis; size and gradient effects; prediction of scatter in fatigue behavior of materials due to variability in material microstructure and service conditions; mechanisms of micro- and macrofractures in advanced materials; designs that minimize fatigue damage and failure; multiscale constitutive modeling to simulate fatigue and fracture evolution; high-temperature deformation; techniques to characterize and predict creep fatigue–oxidation interactions; and other topics relating to the failure behavior of metals and alloys.

We also welcome papers with a focus on microstructure-sensitive fatigue design, which represents a rapidly evolving area in computational solid mechanics, and is central to addressing the influence of microstructures and defects on fatigue life and future needs for more predictive fatigue design of mechanical components for various applications.

Dr. Gbadebo Owolabi
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • mechanical properties
  • deformation
  • fatigue
  • fracture
  • metals
  • metallic alloys

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Published Papers (3 papers)

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Research

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19 pages, 12806 KiB  
Article
Fatigue Response of Additive-Manufactured 316L Stainless Steel
by Melody Chepkoech, Peter Omoniyi and Gbadebo Owolabi
Metals 2024, 14(9), 988; https://doi.org/10.3390/met14090988 - 29 Aug 2024
Cited by 1 | Viewed by 1559
Abstract
This study investigated the fatigue performance of 316L stainless steel fabricated via laser powder bed fusion (LPBF). Stress-controlled fatigue tests were performed at different stress amplitudes on vertically built samples using a frequency of 15 Hz and a stress ratio of 0.1. The [...] Read more.
This study investigated the fatigue performance of 316L stainless steel fabricated via laser powder bed fusion (LPBF). Stress-controlled fatigue tests were performed at different stress amplitudes on vertically built samples using a frequency of 15 Hz and a stress ratio of 0.1. The stress amplitudes were varied to provide the cyclic response of the materials under a range of loading conditions. The average fatigue strength was determined to be 92.94 MPa, corresponding to a maximum stress of 185.87 MPa. The microstructures were observed through scanning electron microscopy (SEM) with the aid of electron backscattered diffraction (EBSD), and the average grain size of the as-built samples was determined to be 15.6 µm, with most grains having a <110> preferred crystallographic orientation. A higher kernel average misorientation value was measured on the deformed surfaces, revealing the increased misorientation of the grains. Defects were observed on the fractured surfaces acting as crack initiators while deflecting the crack propagation paths. The fatigue failure mode for the LPBF 316L samples was ductile, as illustrated by the numerous dimples on fracture surfaces and fatigue striations. Full article
(This article belongs to the Special Issue Mechanical Properties, Fatigue and Fracture of Metallic Materials)
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23 pages, 6494 KiB  
Article
The Brittle Fracture of Iron and Steel and the Sharp Upper Yield Point Are Caused by Cementite Grain Boundary Walls
by Thomas L. Altshuler
Metals 2024, 14(8), 871; https://doi.org/10.3390/met14080871 - 29 Jul 2024
Cited by 1 | Viewed by 2068 | Correction
Abstract
Brittle fractures of iron and steel above twinning temperatures are caused by cementite grain boundary wall cracks. These were revealed by an Atomic Force Microscope (AFM). At temperatures below the ductile–brittle transition (DBT), cracks must propagate longitudinally within cementite walls until the stress [...] Read more.
Brittle fractures of iron and steel above twinning temperatures are caused by cementite grain boundary wall cracks. These were revealed by an Atomic Force Microscope (AFM). At temperatures below the ductile–brittle transition (DBT), cracks must propagate longitudinally within cementite walls until the stress is sufficiently high for the cracks to propagate across ferrite grains. Calculations using these concepts correctly predict the stress and temperature at the DBT required for fractures to occur. At temperatures above the DBT for hypoeutectoid ferritic steels, dislocations must fracture the walls transversely. That will permit pent-up dislocations to pass through the fractured region of the walls into the adjoining grains. Subsequently, there is rapid multiplication of dislocations at the opposite side of the walls by emission. This causes a rapid drop in stress toward the lower yield point. Here, the walls completely surround all of the grains. Where the walls are segmented, such as in iron, dislocations can pass around the walls, resulting in a gradual change from elastic to plastic deformation. The Cottrell atmosphere theory of yielding is not supported experimentally. It was the best available until later experiments, including those using the AFM, were performed. Methods are presented here giving yield strength versus temperature and also the parameters for the Hall–Petch and Griffith equations. Full article
(This article belongs to the Special Issue Mechanical Properties, Fatigue and Fracture of Metallic Materials)
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Review

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25 pages, 20474 KiB  
Review
Research Progress on Fatigue Damage and Surface Strengthening Technology of Titanium Alloys for Aerospace Applications
by Weiming Li, Shaoqing Wang, Xiao Yang, Hongbo Duan, Yimeng Wang and Zhong Yang
Metals 2025, 15(2), 192; https://doi.org/10.3390/met15020192 - 12 Feb 2025
Viewed by 1034
Abstract
As advanced structural materials, titanium alloys have found extensive applications in aerospace, medical devices, and precision electronics industries, serving as critical components for achieving lightweight designs in high-end equipment. In aerospace applications, titanium alloy components are frequently subjected to complex thermo-mechanical loading conditions [...] Read more.
As advanced structural materials, titanium alloys have found extensive applications in aerospace, medical devices, and precision electronics industries, serving as critical components for achieving lightweight designs in high-end equipment. In aerospace applications, titanium alloy components are frequently subjected to complex thermo-mechanical loading conditions involving varying temperature levels and multiaxial stress states, which may induce progressive fatigue damage accumulation and ultimately lead to premature fracture failures. This study conducts a systematic investigation into the fatigue damage mechanisms of aerospace-grade titanium alloys under service conditions, with particular emphasis on elucidating the synergistic effects of microstructural characteristics, surface integrity parameters, and operational temperature variations on fatigue behavior. Through comprehensive analysis, the research reveals that surface modification techniques, including shot peening (SP), ultrasonic surface polling process (USRP), and laser shock peening (LSP), significantly enhance fatigue performance through two primary mechanisms: (1) the generated residual compressive stress fields effectively inhibit crack initiation and retard propagation rates; (2) improved surface integrity characteristics, such as reduced roughness and work-hardened layers, contribute to enhanced oxidation resistance thereby preserving structural integrity. Full article
(This article belongs to the Special Issue Mechanical Properties, Fatigue and Fracture of Metallic Materials)
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