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Metals
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Fatigue Assessment of Metals
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Fatigue Assessment 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 April 2025 | Viewed by 3209

Special Issue Editor

Prof. Dr. Guoqin Sun

E-Mail Website
Guest Editor
Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
Interests: fatigue assessment; failure analysis; damage mechanics; fatigue modeling

Special Issue Information

Dear Colleagues,

You are invited to contribute to this upcoming Special Issue of Metals, entitled “Fatigue Assessment of Metals”. This issue will compile articles on theoretical and experimental research progress into metal crack initiation, crack propagation, and life estimation, with potential topics ranging from damage mechanism to life evaluation of metal materials and structures.

Fatigue damage is a typical form of metal component damage, and the fatigue damage of structural components often brings disastrous consequences. Preventing the accidental failure of structural components is one of the design objectives of any engineering structure. Based on fatigue tests and the simulation of metal components, the theory and method of fatigue damage assessments of metal materials or components are proposed. These methods promise to provides a bases for structural safety, as well as for the design, material selection, and process selection of metal components, so as to further improve the fatigue resistance of structures and delay or avoid fatigue failure. This work requires the participation of multidisciplinary expertise, including material science, structural analysis, detection technology, structural design, manufacturing technology, computer technology, quality assessment, physics, reliability, etc. In order to solve the complex engineering fatigue problem, it is necessary to involve both micro- and macro-scale theory and experimental methods.

A diverse variety of topics may be addressed under the umbrella of the fatigue assessment of metal materials and structures, including:

(1) Residual strength or life, including the influence of multi-site fatigue damage;

(2) Crack propagation, including the influence of multiple cracks or fatigue damage of multiple parts;

(3) Damage assessment using different fatigue damage detection;

(4) Life prediction includes crack initiation and crack propagation;

(5) Uniaxial and multiaxial fatigue damage assessments of different metal materials and structures;

and various related topics.

We look forward to your contributions to this Special Issue.

Prof. Dr. Guoqin Sun
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 assement
  • strength assessment
  • life prediction
  • crack initiation
  • crack propagation
  • fatigue damage evaluation
  • fatigue modeling
  • fatigue damage mechanism
  • damage detection
  • fatigue failure

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (3 papers)

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Research

20 pages, 23822 KiB  
Article
Fatigue Life Assessment of Corroded AlSi10MgMn Specimens
by Markus Schönowitz, Stefan Fladischer, Peter Oberreiter, Bernd Maier, Florian Grün and Kathrin Bauer-Troßmann
Metals 2024, 14(10), 1135; https://doi.org/10.3390/met14101135 - 5 Oct 2024
Viewed by 669
Abstract
This study investigates the influence of pre-corrosion damage on the fatigue behavior of AlSi10MgMn high-pressure die-cast specimens, using the statistical distribution of corrosion depths. The analysis is conducted on two different surface conditions: an unmachined rough surface (Ra=5.05 [...] Read more.
This study investigates the influence of pre-corrosion damage on the fatigue behavior of AlSi10MgMn high-pressure die-cast specimens, using the statistical distribution of corrosion depths. The analysis is conducted on two different surface conditions: an unmachined rough surface (Ra=5.05μm) and a machined, polished surface (Ra=0.25μm). For the unmachined specimens, the corrosive damage manifests as homogeneously spread localized corrosion, whereas the polished specimens exhibit less uniform but deeper corrosion. The average corrosion depth of the polished specimens is found to be slightly higher (313 μm compared to 267 μm) with a broader depth distribution. Specimens are tested under a constant bending load amplitude in laboratory conditions at a stress ratio of R=0 until fracture. A fracture mechanics-based methodology is developed to assess the remaining fatigue life of corroded specimens, utilizing short and long crack fracture mechanical parameters derived from SENB specimens. This model incorporates a thickness reduction of the critical specimen cross-section based on the corrosion depth distribution and combines it with a small initial crack of the intrinsic defect size (aeff=14μm). Regardless of the surface condition, using the most frequent corrosion depth for thickness reduction provides a good estimate of the long-life fatigue strength, while using the 90th percentile depth allows for a conservative assessment. Full article
(This article belongs to the Special Issue Fatigue Assessment of Metals)
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13 pages, 12945 KiB  
Article
Physical Simulation of Mold Steels Repaired by Laser Beam Fusion Deposition
by Joel de Jesus, José A. M. Ferreira, Carlos Capela, José D. M. da Costa and Luís Borrego
Metals 2024, 14(6), 663; https://doi.org/10.3390/met14060663 - 3 Jun 2024
Viewed by 662
Abstract
In the present work, a study of the fatigue strength of two materials widely used in the production of molds, namely, the AISI P20 and AISI H13 steels, is presented. The tests were performed at a constant amplitude with a stress ratio of [...] Read more.
In the present work, a study of the fatigue strength of two materials widely used in the production of molds, namely, the AISI P20 and AISI H13 steels, is presented. The tests were performed at a constant amplitude with a stress ratio of R = 0 using samples where U-shaped notches were filled with laser beam fusion deposition. Three different sets of deposition parameters for each material were analyzed. Fatigue strength results are presented as S-N curves obtained for filled and non-filled materials. In addition to the assessment of the fatigue strength, metallography, hardness, and the fracture surface of the specimens tested were also evaluated. In general, a high number of metallurgic defects was detected, and consequently, a decrease in the mechanical properties of the materials was observed, especially the fatigue strength. However, the parameter optimization of the repairing laser process produced repaired zones with good metallurgical quality, leading to higher fatigue strength in both of the high-strength steels analyzed. Full article
(This article belongs to the Special Issue Fatigue Assessment of Metals)
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11 pages, 12566 KiB  
Article
Influence of Loading Waveform on the Fatigue Life of 34CrNi3MoVA Steel
by Xiaoyan Guan, Jie Tang and Jianzhi Chen
Metals 2024, 14(1), 110; https://doi.org/10.3390/met14010110 - 16 Jan 2024
Viewed by 1230
Abstract
Mechanical components often experience fatigue loading from various waveform conditions during their operational lifespan. However, the underlying mechanisms through which variations in loading waveform affect the fatigue life of components remain unclear. Thus, this study conducted tension–compression fatigue experiments on 34CrNi3MoVA steel specimens [...] Read more.
Mechanical components often experience fatigue loading from various waveform conditions during their operational lifespan. However, the underlying mechanisms through which variations in loading waveform affect the fatigue life of components remain unclear. Thus, this study conducted tension–compression fatigue experiments on 34CrNi3MoVA steel specimens under the same stress amplitude with different waveforms (cosine, triangular, sawtooth, and reverse sawtooth) to investigate the effects of loading waveform variations on the cyclic strain hardening behaviors, the fatigue fracture failure, and the fatigue life. The results indicated that specimens under different waveforms all exhibited cyclic strain hardening. The fatigue cyclic hardening level progressively increased in the order of cosine, triangular, and sawtooth waveforms, resulting in a continuous increase in cyclic saturation strain amplitude. The analysis of fatigue fractures demonstrated a consistent increase in both the initiation and propagation zone areas in the order of cosine, triangular, and sawtooth waveforms, and the boundary between the propagation and final fracture zones gradually shifted from a straight to a curved shape. The influence mechanisms of cyclic loading waveforms on the fatigue life of specimens were analyzed based on the energy dissipation, leading to the development of a universal fatigue life prediction model applicable to different waveform conditions, the model was then verified with the reverse sawtooth wave specimens and resulted in a prediction error less than 15%. The study is expected to serve as a significant guide for predicting and evaluating the fatigue life of mechanical components under various fatigue loading conditions. Full article
(This article belongs to the Special Issue Fatigue Assessment of Metals)
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