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Crystals
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Fatigue Behavior in Metals and Alloys
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Fatigue Behavior in Metals and Alloys

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: closed (15 February 2024) | Viewed by 5145

Special Issue Editors

Dr. Cuiyun Liu

E-Mail Website
Guest Editor
Research Institute for Frontier Science, Beihang University, Beijing 100191, China
Interests: fatigue behavior; in situ characterization; testing and evaluation of materials; micro-nanoprocessing
Dr. Ruixiao Zheng

E-Mail Website
Guest Editor
Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, China
Interests: mechanical properties; microstructure control; ultrafine grained materials

Special Issue Information

Dear Colleagues,

Fatigue, wear, and corrosion are three main failure modes of materials, among which fatigue fracture is a common failure mode. When the material or structural parts reach the fatigue stage, there is no indication in the form of significant deformation or a sudden fracture, which makes overhaul and maintenance more difficult and often leads to the occurrence of major accidents. Material fatigue is closely related to various application fields of modern engineering technology, involving material science, mechanical design, mechanics, metal physics, applied mathematics, and many other disciplines. With the increasing requirement of modern engineering technology for component reliability, fatigue behavior research and anti-fatigue design and application will remain in a core and key position for a long time.

This Special Issue will bring together high-quality research and review articles on the fatigue behavior of metals and alloys. Potential topics include but are not limited to:

  • Fatigue behavior and mechanism;
  • Fatigue failure characteristics;
  • Fatigue of components;
  • Fatigue of materials;
  • Low cycle fatigue;
  • High cycle fatigue;
  • Super-high cycle fatigue;
  • Anti-fatigue process/damage design;
  • 3D characterization of crack;
  • Mechanical fatigue;
  • Thermal fatigue;
  • Corrosion fatigue;
  • Life prediction.

Dr. Cuiyun Liu
Dr. Ruixiao Zheng
Guest Editors

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. Crystals 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 2100 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.

Published Papers (4 papers)

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Research

14 pages, 3069 KiB  
Article
Stress-Based Model for Calculating the Opening Angle of Notch Cracks in a Magnesium Alloy under Multiaxial Fatigue
by Henrique Videira, Vitor Anes and Luis Reis
Crystals 2024, 14(3), 211; https://doi.org/10.3390/cryst14030211 - 23 Feb 2024
Viewed by 786
Abstract
This paper presents a model to calculate the opening angle of crack initiation in notched fractures subjected to multiaxial loading. To validate the proposed model, a study was performed on polished AZ31B-F magnesium alloy specimens under multiaxial high-cycle fatigue loading. The specimens exhibited [...] Read more.
This paper presents a model to calculate the opening angle of crack initiation in notched fractures subjected to multiaxial loading. To validate the proposed model, a study was performed on polished AZ31B-F magnesium alloy specimens under multiaxial high-cycle fatigue loading. The specimens exhibited a notch in the smaller cross-sectional area, which was created with a special drilling jig to promote the formation of fatigue cracks in this localized area of the specimen. The load paths used in the experiments and numerical analyses were proportional and non-proportional, resulting in different stress states in the crack front opening, which were determined by finite element analysis to validate the proposed model. To obtain more accurate numerical results for these estimates, these finite element analyses were performed using the nonlinear Chaboche plasticity model of ABAQUS® 2021 software. A sensitivity analysis was also performed to determine which load component—axial or torsional—has a greater influence on the fatigue strength and contributes significantly to the crack opening process. The results show that the type of load path and the stress level of each load component—axial and torsional—has a strong influence on the opening angle of the notch crack and the fatigue lifetime of the specimen. This result is confirmed not only by the experimentally determined fatigue strength, but also by a fractographic analysis performed on the surface of the specimens for both load paths. Moreover, the results show an acceptable correlation between the experimental results and the estimates obtained with the proposed model and the stresses obtained with the finite element analysis. Full article
(This article belongs to the Special Issue Fatigue Behavior in Metals and Alloys)
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23 pages, 30908 KiB  
Article
Fatigue Behavior and Mechanism Study on Lugs of TC18 Titanium Alloy
by Cuiyun Liu, Bo Liu and Chaoli Ma
Crystals 2023, 13(9), 1320; https://doi.org/10.3390/cryst13091320 - 29 Aug 2023
Viewed by 1016
Abstract
Aerospace structural components are in a complex stress state when they undertake load due to their specific geometric construction. Their fatigue behavior is quite different from the materials that undertake the standard stress state. The research on fatigue behavior of aircraft structures was [...] Read more.
Aerospace structural components are in a complex stress state when they undertake load due to their specific geometric construction. Their fatigue behavior is quite different from the materials that undertake the standard stress state. The research on fatigue behavior of aircraft structures was the foundation of their design and life prediction. Lugs are one of the important connected components of aircrafts. In this paper, the mathematical mechanics’ method was used to calculate the structural feature parameters of TC18 Titanium alloy lugs under several specific loads. The design reference values of structural feature parameters were put forward for lugs. The fatigue behavior and fatigue failure characteristics under specific loads were studied experimentally. The fatigue experiment was conducted to verify the criterion, and the validity of the criterion mentioned above was confirmed by the test results. The fatigue life S-N curves under different loading forms and different mean stresses were researched. The fatigue failure characteristics, such as fatigue crack initiation, propagation, and final fracture, were also studied. These studies provided theoretical support for the anti-fatigue damage design of lugs. Full article
(This article belongs to the Special Issue Fatigue Behavior in Metals and Alloys)
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14 pages, 4455 KiB  
Article
The Effect of Microstructural Defects on High-Cycle Fatigue of Ti Grade 2 Manufactured by PBF-LB and Hydrostatic Extrusion
by Kamil Majchrowicz, Agnieszka Chmielewska, Bartłomiej Wysocki, Sylwia Przybysz-Gloc, Mariusz Kulczyk, Halina Garbacz and Zbigniew Pakieła
Crystals 2023, 13(8), 1250; https://doi.org/10.3390/cryst13081250 - 13 Aug 2023
Cited by 2 | Viewed by 911
Abstract
The aim of this study was to show the effect of manufacturing defects in a commercially pure Ti Grade 2 produced by a laser beam powder bed fusion (PBF-LB) process on its high-cycle fatigue life. For this purpose, the high-cycle fatigue performance of [...] Read more.
The aim of this study was to show the effect of manufacturing defects in a commercially pure Ti Grade 2 produced by a laser beam powder bed fusion (PBF-LB) process on its high-cycle fatigue life. For this purpose, the high-cycle fatigue performance of PBF-LB Ti Grade 2 was compared to its ultrafine-grained (UFG) counterpart processed by hydrostatic extrusion exhibiting a similar mechanical properties under static tensile. The yield strength of the PBF-LB and UFG Ti Grade 2 was 740 and 783 MPa, respectively. The PBF-LB Ti Grade 2 consisted of a typical columnar of prior β grains with an acicular martensite α’ microstructure, while UFG Ti Grade 2 was mainly composed of fine, equiaxed α phase grains/subgrains with a size of 50–150 nm. A residual porosity of 0.21% was observed in the PBF-LB Ti Grade 2 by X-ray computed tomography, and, despite similar yield strength, a significantly higher endurance fatigue limit was noticed for UFG Ti Grade 2 (420 MPa) compared to PBF-LB Ti Grade 2 (330 MPa). Fatigue striation analysis showed that the fatigue crack propagation rate was not affected by manufacturing technology. In turn, the high-cycle fatigue life was drastically reduced as the size of manufacturing defects (such as pores or lack of fusion zones) increased. Full article
(This article belongs to the Special Issue Fatigue Behavior in Metals and Alloys)
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21 pages, 22378 KiB  
Article
Thermal Fatigue Crack Propagation Process and Mechanism of Multicomponent Al-7Si-0.3Mg Alloy
by Zhengjun Wang, Xinyang Liu, Chen Dong, Jie Chen and Lianxiang Liu
Crystals 2023, 13(7), 1068; https://doi.org/10.3390/cryst13071068 - 7 Jul 2023
Viewed by 2047
Abstract
The thermal fatigue behavior of multicomponent Al-7Si-0.3Mg alloys in four different treatment states at typical temperature amplitudes 20 °C→350 °C was studied. The morphology of the second phase particles and crack propagation, and distribution characteristics of dislocations in the thermal fatigue specimens of [...] Read more.
The thermal fatigue behavior of multicomponent Al-7Si-0.3Mg alloys in four different treatment states at typical temperature amplitudes 20 °C→350 °C was studied. The morphology of the second phase particles and crack propagation, and distribution characteristics of dislocations in the thermal fatigue specimens of multicomponent Al-7Si-0.3Mg alloys, were analyzed by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDAX spectrum), and transmission electron microscopy (TEM). The influencing factors, the process, and the mechanism of thermal fatigue crack propagation were mainly studied. The results show that under the same temperature amplitude, the thermal fatigue properties and dislocation densities of the new aluminum alloy and the new aluminum alloy under T6 heat treatment are significantly higher than that of the multicomponent Al-7Si-0.3Mg alloy in cast and refined and modified treatment. The crack growth of thermal fatigue specimen depends on three factors: the temperature amplitude, oxidation, and residual stress. The process of thermal fatigue crack propagation mainly experiences crack initiation and the formation of microcracks, but only a few microcracks continue to expand rapidly or preferentially expand into main cracks. The mechanism of thermal fatigue crack propagation is mainly under the action of thermal stress, the crack tip undergoes a cycle of repeated alternation of sharpening → passivation → sharpening, and the crack continues to move forward from its tip intermittently in the way of propagation → stopping → propagation until fracture failure. Full article
(This article belongs to the Special Issue Fatigue Behavior in Metals and Alloys)
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