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Metals
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Advanced Characterisation of Fatigue Behaviour in Metal Alloys
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Advanced Characterisation of Fatigue Behaviour in Metal Alloys

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

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 7890

Special Issue Editor

Prof. Dr. Pablo Lopez-Crespo

E-Mail Website
Guest Editor
Department of Civil and Materials Engineering, Universidad de Malaga, Malaga, Spain
Interests: fracture mechanics; mechanical behavior of materials

Special Issue Information

Dear Colleagues,

Fatigue is the single most important cause of failure in metal alloys and still causes unexpected failures, such as the accident of Southwest Airlines in April 2018. The costs related to fatigue failures across the different industries are immense, not only in economic terms, but also in terms of human lives. Understanding the different processes that take place at the fatigue crack tip and its surroundings is essential if we are to improve our predictions and thus reduce the number of sudden failures. There are a number of techniques that have been recently developed in other fields that can be applied to further our understanding of the different mechanisms affecting fatigue failure. These include experimental, analytical and numerical methods and a combination of the different approaches. We encourage engineers, as well as academics and scientists, to submit high-quality research papers analysing different fatigue issues from the nano to the macro scales and in a range of materials from traditional metal alloys to those that have been newly developed. Review papers summarising, in a critical way, specific topics affecting the fatigue behaviour of materials are also welcome.

Prof. Dr. Pablo Lopez-Crespo
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 failures
  • crack
  • mechanisms
  • fatigue behavior
  • metal alloys

Published Papers (3 papers)

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Research

11 pages, 2829 KiB  
Article
Numerical Modeling of Plasticity-Induced Fatigue Crack Growth Retardation Due to Deflection in the Near-Tip Area
by Jesús Toribio, Juan-Carlos Matos and Beatriz González
Metals 2021, 11(4), 541; https://doi.org/10.3390/met11040541 - 26 Mar 2021
Cited by 6 | Viewed by 1714
Abstract
This article studies the retardation effect in plasticity-induced fatigue crack growth rate for a low-medium strength steel, due to the appearance of microdeflections in the crack path. To this end, the finite element method was used to model the crack with its kinked [...] Read more.
This article studies the retardation effect in plasticity-induced fatigue crack growth rate for a low-medium strength steel, due to the appearance of microdeflections in the crack path. To this end, the finite element method was used to model the crack with its kinked tip under several stress intensity factor (SIF) ranges. The results allowed a calculation (after a small number of cycles) of the fatigue crack propagation rate for the multiaxial and uniaxial fatigue configurations at the microscopic level. It was observed that the retardation effect rose with an increase in the initial kinked crack tip angle, an increase in the initial projected kinked crack tip length, and with a decrease in the SIF range. Full article
(This article belongs to the Special Issue Advanced Characterisation of Fatigue Behaviour in Metal Alloys)
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20 pages, 11245 KiB  
Article
Advantageous Description of Short Fatigue Crack Growth Rates in Austenitic Stainless Steels with Distinct Properties
by Lukáš Trávníček, Ivo Kuběna, Veronika Mazánová, Tomáš Vojtek, Jaroslav Polák, Pavel Hutař and Miroslav Šmíd
Metals 2021, 11(3), 475; https://doi.org/10.3390/met11030475 - 13 Mar 2021
Cited by 4 | Viewed by 2061
Abstract
In this work two approaches to the description of short fatigue crack growth rate under large-scale yielding condition were comprehensively tested: (i) plastic component of the J-integral and (ii) Polák model of crack propagation. The ability to predict residual fatigue life of bodies [...] Read more.
In this work two approaches to the description of short fatigue crack growth rate under large-scale yielding condition were comprehensively tested: (i) plastic component of the J-integral and (ii) Polák model of crack propagation. The ability to predict residual fatigue life of bodies with short initial cracks was studied for stainless steels Sanicro 25 and 304L. Despite their coarse microstructure and very different cyclic stress–strain response, the employed continuum mechanics models were found to give satisfactory results. Finite element modeling was used to determine the J-integrals and to simulate the evolution of crack front shapes, which corresponded to the real cracks observed on the fracture surfaces of the specimens. Residual fatigue lives estimated by these models were in good agreement with the number of cycles to failure of individual test specimens strained at various total strain amplitudes. Moreover, the crack growth rates of both investigated materials fell onto the same curve that was previously obtained for other steels with different properties. Such a “master curve” was achieved using the plastic part of J-integral and it has the potential of being an advantageous tool to model the fatigue crack propagation under large-scale yielding regime without a need of any additional experimental data. Full article
(This article belongs to the Special Issue Advanced Characterisation of Fatigue Behaviour in Metal Alloys)
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22 pages, 5333 KiB  
Article
Numerical Prediction of the Fatigue Crack Growth Rate in SLM Ti-6Al-4V Based on Crack Tip Plastic Strain
by Fábio F. Ferreira, Diogo M. Neto, Joel S. Jesus, Pedro A. Prates and Fernando V. Antunes
Metals 2020, 10(9), 1133; https://doi.org/10.3390/met10091133 - 23 Aug 2020
Cited by 32 | Viewed by 3603
Abstract
This study presents a numerical model to predict the fatigue crack growth (FCG) rate in compact tension specimens under constant amplitude cyclic loadings. The material studied is the Ti-6Al-4V titanium alloy produced by selective laser melting, which was submitted to two different post-treatments: [...] Read more.
This study presents a numerical model to predict the fatigue crack growth (FCG) rate in compact tension specimens under constant amplitude cyclic loadings. The material studied is the Ti-6Al-4V titanium alloy produced by selective laser melting, which was submitted to two different post-treatments: (i) hot isostatic pressing, and (ii) heat treatment. The developed finite element model uses the cumulative plastic strain at the crack tip to define the nodal release. Two different FCG criteria are presented, namely the incremental plastic strain (IPS) criterion and the total plastic strain (TPS) criterion. The calibration of the elasto-plastic constitutive model was carried out using experimental data from low cycle fatigue tests of smooth specimens. For both proposed crack growth criteria, the predicted da/dN-ΔK curve is approximately linear in log-log scale. However, the slope of the curve is higher using the TPS criterion. The numerical predictions of the crack growth rate are in good agreement with the experimental results, which indicates that cyclic plastic deformation is the main damage mechanism. The numerical results showed that increasing the stress ratio leads to a shift up of the da/dN-ΔK curve. The effect of stress ratio was dissociated from variations of cyclic plastic deformation, and an extrinsic mechanism, i.e., crack closure phenomenon, was found to be the cause. Full article
(This article belongs to the Special Issue Advanced Characterisation of Fatigue Behaviour in Metal Alloys)
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