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Metals
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Fatigue, Creep Behavior and Fracture Mechanics of Metals
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Fatigue, Creep Behavior and Fracture Mechanics of Metals

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

Deadline for manuscript submissions: 20 August 2024 | Viewed by 1762

Special Issue Editor

Dr. Riccardo Nobile

E-Mail Website
Guest Editor
Department of Engineering for Innovation, Università del Salento, 73100 Lecce, Italy
Interests: fatigue; welded joints; experimental mechanics; FEM; damage models; low-cycle fatigue; aluminum foam; residual stress
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The comprehension of the fatigue, creep, and fracture behavior of metallic materials is fundamental in order to assess the reliability of structural components. In this field, research progress helps to improve technical problems and constitutes a direct contribution to the safety of society.

All these phenomena have been largely studied, starting from the publication of the first scientific papers about fatigue in the second half of the XIX century and the quick development of the fracture mechanics approach in the latter years of the XX century, up to the development of analytical models of creep in recent years, several theoretical and experimental models have been proposed to pragmatically address these problems. However, technological improvements in the manufacturing process and the introduction of completely new ones, e.g., additive manufacturing, force us to rethink, adapt to, and even develop new analytical, numerical, and experimental tools.

This Special Issue intends to collect several articles on all the aspects that help to determine the failure of metallic materials. Research contributions and reviewer surveys on the identification, evaluation, and measurement of the damage process involving fatigue, creep, and fracture behavior, considering both a theoretical and/or an experimental approach, are welcome. Presentations of industrial cases illustrating the use of analytical, numerical, and experimental techniques for the study of the failure of metallic components in the automotive, aeronautical, and mechanical sector are also welcome.

Dr. Riccardo Nobile
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

  • fatigue
  • creep
  • fracture
  • failure
  • mechanical behavior

Published Papers (2 papers)

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Research

20 pages, 17699 KiB  
Article
Effect of Hydrogen on Fatigue Life and Fracture Morphologies of TRIP-Aided Martensitic Steels with Added Nitrogen
by Tomohiko Hojo, Akihiko Nagasaka, Junya Kobayashi, Yuki Shibayama and Eiji Akiyama
Metals 2024, 14(3), 346; https://doi.org/10.3390/met14030346 - 17 Mar 2024
Viewed by 789
Abstract
The effects of hydrogen on the tensile properties, fatigue life, and tensile and fatigue fracture morphologies of nitrogen-added ultrahigh-strength transformation-induced plasticity (TRIP)-aided martensitic (TM) steels were investigated. The total elongation and number of cycles to failure (Nf) of the hydrogen-charged [...] Read more.
The effects of hydrogen on the tensile properties, fatigue life, and tensile and fatigue fracture morphologies of nitrogen-added ultrahigh-strength transformation-induced plasticity (TRIP)-aided martensitic (TM) steels were investigated. The total elongation and number of cycles to failure (Nf) of the hydrogen-charged TM steels decreased with the addition of nitrogen; in particular, adding 100 ppm of nitrogen decreased the total elongation and Nf of the TM steels. The quasi-cleavage cracking around the AlN occurred near the sample surface, which is the crack propagation region, although dimples appeared at the center of the fracture surface in the tensile samples. The initial fatigue crack initiated at the AlN precipitate or matrix/AlN interface, located at the notch root. During crack propagation, new cracks were initiated at the AlN precipitates or matrix/AlN interfaces, while quasi-cleavage crack regions were observed around the AlN precipitates. The decrease in the total elongation and Nf of the hydrogen-charged TM steel with 100 ppm of added nitrogen might be attributable to the crack initiation around the AlN precipitates formed by a large amount of hydrogen trapped at the AlN precipitates and matrix/AlN interfaces, and to the dense distribution of AlN, which promoted crack linkage. Full article
(This article belongs to the Special Issue Fatigue, Creep Behavior and Fracture Mechanics of Metals)
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17 pages, 5199 KiB  
Article
In Situ Fatigue Damage Monitoring by Means of Nonlinear Ultrasonic Measurements
by Andrea Saponaro and Riccardo Nobile
Metals 2024, 14(1), 11; https://doi.org/10.3390/met14010011 (registering DOI) - 21 Dec 2023
Viewed by 735
Abstract
In the present work, the results of acoustic nonlinear response of ultrasonic wave propagation when monitoring the progress of damage induced by fatigue on notched C45 carbon steel specimens have been reported. Two ultrasound probes were fixed to the specimens during the tests. [...] Read more.
In the present work, the results of acoustic nonlinear response of ultrasonic wave propagation when monitoring the progress of damage induced by fatigue on notched C45 carbon steel specimens have been reported. Two ultrasound probes were fixed to the specimens during the tests. The input signal was sinusoidal type, while the corresponding ultrasound response signal was acquired and recorded at each stage of the test by means of a digital oscilloscope. A nonlinear frequency study was performed on the acquired data to evaluate the change in the second- and third-order nonlinearity coefficients of β1 and β2, respectively, on the tested specimens. Ultrasonic results were correlated to plastic strain at the notch tip in the initial phases of fatigue and stiffness degradation. The results showed a significant increase in second-order nonlinearity β1 in the early stages of fatigue life. Subsequently, starting from about 30–40% of the fatigue life, the nonlinearity of β1 increases. Before final failure, from 80 to 85% of fatigue life, the second-order nonlinearity further increases in the crack propagation stages. The nonlinear parameter of the third-order β2 was less sensitive to damage than the parameter β1, showing a rapid increase only starting from approximately 80 to 85% of the fatigue life. The proposed method proved to be valid for detective damage induced by fatigue and to predict the lifetime of metal materials. Full article
(This article belongs to the Special Issue Fatigue, Creep Behavior and Fracture Mechanics of Metals)
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