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Fatigue Life under Multiaxial Load Conditions
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Fatigue Life under Multiaxial Load Conditions

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Materials Characterization".

Deadline for manuscript submissions: closed (10 April 2022) | Viewed by 6788

Special Issue Editor

Prof. Marta Kurek

E-Mail Website
Guest Editor
Department of Mechanics and Machine Design, Opole University of Technology, 45-271 Opole, Poland
Interests: fatigue life; multiaxial criteria; S–N curves

Special Issue Information

Dear Colleagues,

A practical aspect of more than 170 years of research on fatigue is the proposal of methods to estimate the fatigue life of materials and structures. Their main purpose is to predict the time of reliable and safe operation of a machine or device already at the design stage.

Currently, the approach to assessing the fatigue life of machinery and equipment components is similar in many areas of civil engineering. Examples include the design of airplanes and rockets, road and rail vehicles, ships, turbines and power generators, civil engineering structures, chemical and process apparatus, working machinery, and other equipment. The proper estimation of the fatigue life of these facilities is a very important problem of modern technology, and incorrect assessments can be the cause of disasters.

Along with the evolution of the knowledge on fatigue, new approaches to predicting fatigue strength and durability have emerged. Despite the constantly growing number of papers and the growing interest of researchers in this issue, so far it has not been possible to develop a clear and effective method of estimating the period of safe operation of elements, systems, and whole devices and structures.

This Special Issue will collect articles on estimating the fatigue life of components under multiaxial load conditions. Fatigue is a multifaceted process and fatigue failure is dependent on several factors, including material type and condition, component geometry, load type, and stress state. Each of these factors may be the main subject of discussion of the presented articles. Works presenting the results of experimental research are welcome. Moreover, fatigue-related articles concerning additively manufactured (AM) components are desirable.

I am pleased to invite you to submit manuscripts. Full articles, communications, and reviews are welcome.

Prof. Marta Kurek
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. Materials is an international peer-reviewed open access semimonthly 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

  • Multiaxial fatigue
  • Metals and alloys
  • S-N curves
  • Multiaxial criteria
  • Fatigue life prediction
  • Microstructure

Published Papers (4 papers)

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Research

19 pages, 5927 KiB  
Article
A Novel Multiaxial Strain-Based Criterion Considering Additional Cyclic Hardening
by Sabrina Vantadori
Materials 2021, 14(10), 2542; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14102542 - 13 May 2021
Cited by 6 | Viewed by 1429
Abstract
The present paper is dedicated to the theoretical evaluation of a loading feature, that may have a significant influence on fatigue phenomenon: non-proportionality. As a matter of fact, considerable interactions between dislocations, leading to the formation of dislocation cells, cause additional cyclic hardening [...] Read more.
The present paper is dedicated to the theoretical evaluation of a loading feature, that may have a significant influence on fatigue phenomenon: non-proportionality. As a matter of fact, considerable interactions between dislocations, leading to the formation of dislocation cells, cause additional cyclic hardening of material. Such a phenomenon is experimentally observed for materials sensitive to non-proportionality. In such a context, the present paper is aimed to propose a novel multiaxial strain-based criterion, the refined equivalent deformation (RED) criterion, which allows to take into account, in fatigue life estimation, both strain amplitude and additional cyclic hardening. The accuracy of the novel criterion is evaluated by considering experimental tests, performed on Ti-6Al-4V specimens, subjected to multiaxial LCF loading. Full article
(This article belongs to the Special Issue Fatigue Life under Multiaxial Load Conditions)
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9 pages, 1328 KiB  
Article
Formulation of Strain Fatigue Criterion Based on Complex Numbers
by Tadeusz Łagoda, Karolina Głowacka, Marta Kurek and Dariusz Skibicki
Materials 2021, 14(5), 1227; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14051227 - 05 Mar 2021
Cited by 2 | Viewed by 1284
Abstract
In the case of many low-cycle multiaxial fatigue criteria, we encounter a mathematical problem of adding vectors of normal and shear strains. Typically, the problem of defining an equivalent strain is solved by weighting factors. Unfortunately, this ignores the fact that these vectors [...] Read more.
In the case of many low-cycle multiaxial fatigue criteria, we encounter a mathematical problem of adding vectors of normal and shear strains. Typically, the problem of defining an equivalent strain is solved by weighting factors. Unfortunately, this ignores the fact that these vectors represent other physical quantities: the normal strain is a longitudinal strain, and the shear strain is a rotation angle. Therefore, the goal of the present work was to propose a method of combining different types of strains by adopting a system of complex numbers. The normal strain was defined as the real part and the shear strain was defined as the imaginary part. Using this approach, simple load states, such as pure bending and pure torsion, have been transformed into an expression for equivalent strain identical to the previously proposed criteria defined by Macha. Full article
(This article belongs to the Special Issue Fatigue Life under Multiaxial Load Conditions)
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25 pages, 1806 KiB  
Article
Validating the Methods to Process the Stress Path in Multiaxial High-Cycle Fatigue Criteria
by Jan Papuga, Eva Cízová and Aleksander Karolczuk
Materials 2021, 14(1), 206; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14010206 - 04 Jan 2021
Cited by 8 | Viewed by 2055
Abstract
The paper discusses one of the key features in the multiaxial fatigue strength evaluation—the procedure in which the stress path is analyzed to provide relevant measures of parameters required by multiaxial criteria. The selection of this procedure affects the complete equivalent stress derived [...] Read more.
The paper discusses one of the key features in the multiaxial fatigue strength evaluation—the procedure in which the stress path is analyzed to provide relevant measures of parameters required by multiaxial criteria. The selection of this procedure affects the complete equivalent stress derived for any multiaxial load combinations. Three major concepts—the minimum circumscribed circle, minimum circumscribed ellipse, and moment of inertia methods—are described. Analytical solutions of their evaluation for multiaxial stress state with components described by harmonic functions are provided. The concepts are validated on available experimental data when included into six different multiaxial fatigue strength criteria. The results show that the moment of inertia results in too conservative results. Differences between both methods of circumscribed entities are much smaller. There are indications however that the minimum circumscribed ellipse solution works better for critical plane criteria and for the criteria based on stress tensor transformation into the Ilyushin deviatoric space. On the other hand, the minimum circumscribed ellipse solution tends to shift integral criteria to the conservative side. Full article
(This article belongs to the Special Issue Fatigue Life under Multiaxial Load Conditions)
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21 pages, 6578 KiB  
Article
Fatigue Life of Aluminum Alloys Based on Shear and Hydrostatic Strain
by Tadeusz Łagoda, Karolina Głowacka and Andrzej Kurek
Materials 2020, 13(21), 4850; https://0-doi-org.brum.beds.ac.uk/10.3390/ma13214850 - 29 Oct 2020
Cited by 5 | Viewed by 1371
Abstract
The main purpose of this paper is to propose, based on the literature review, a new multiaxial fatigue strain criterion, analogous to the Dang Van stress criterion, considering the maximum amplitude of the shear strain and volumetric strain. The proposed strain criterion was [...] Read more.
The main purpose of this paper is to propose, based on the literature review, a new multiaxial fatigue strain criterion, analogous to the Dang Van stress criterion, considering the maximum amplitude of the shear strain and volumetric strain. The proposed strain criterion was successfully verified by fatigue tests in cyclic bending with torsion of specimens made of 2017A-T4 and 6082-T6 aluminum alloy. The scatter of test results for cyclic bending and the combination of cyclic bending and torsion is included in the scatter of tests for the cyclic torsion of the analyzed materials. Fracture surfaces for respective bending and torsion in the 6082-T6 aluminum test with strain control showed that, in the case of bending, cracks can be observed that develop from the surface of the specimen towards the bending plane. They are inclined from the fatigue crack at an angle of 45° in relation to the crack surface and the remaining cracks come from the static fracture. In the case of torsion, however, a conical fracture at 45° and a static torsion zone can be observed. Full article
(This article belongs to the Special Issue Fatigue Life under Multiaxial Load Conditions)
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