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Metals
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Computational Mechanics of Fatigue and Fracture in Metallic Materials
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Computational Mechanics of Fatigue and Fracture in Metallic Materials

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

Deadline for manuscript submissions: closed (28 February 2023) | Viewed by 15226

Special Issue Editors

Prof. Dr. José César de Sá

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Guest Editor
Mechanical Department, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
Interests: nonlinear computational mechanics; large deformations in elastoplasticity; finite element architecture; nonlinear contact mechanics; damage and fracture modeling; modelling of material forming; metal forming; glass forming
Special Issues, Collections and Topics in MDPI journals
Dr. Abílio M. P. De Jesus

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Guest Editor
Department of Mechanical Engineering, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
Interests: manufacturing processes; simulation; fracture mechanics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

I would like to invite you to contribute to this Special Issue on “Computational Mechanics of Fatigue and Fracture in Metallic Materials” that aims to address multiple associated aspects, ranging from constitutive model proposals to numerical solution strategies for fatigue crack initiation, propagation, and fracture.

The increased interest in fatigue and fracture understanding is partly prompted by the fact that conventional damage and fatigue models and fracture criteria in many situations fail to accurately predict ductile and fatigue failure, especially for complex loading paths and for new advanced materials. There is the space, but particularly the need, for new ideas and proposals to tackle those limitations and to face the associated computational challenges of fatigue failure modeling, at both the micro and the macro scales.

A diverse variety of topics may be addressed for fatigue crack initiation and propagation and fracture modeling, comprising:

  • Theoretical and numerical aspects related to advanced fully coupled constitutive equations, including time and space discretization, complex loading conditions involving large plastic straining, nonproportional loading and strain rate effects, shear-loading effects;
  • New mathematical formulations and numerical solution strategies for continuous/discontinuous transition, size effects, mesh dependence, solution schemes involving nonlocal methods, phase–field models, cohesive zone models, XFEM and GFEM approaches;
  • Multiscale strategies for modeling fatigue crack initiation and growth and fracture, scale-bridging, and model order reduction techniques;

and various related topics.

We look forward to your contribution to this Special Issue on “Computational Mechanics of Fatigue and Fracture of Metallic Materials”.

Prof. Dr. Jose M.A. Cesar De Sa
Prof. Abílio de Jesus
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. 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
  • fracture
  • ductile damage
  • crack initiation
  • crack growth
  • phenomenological and micromechanics models
  • numerical modelling
  • multiscale modeling
  • continuous/discontinuous transition
  • nonlocal and phase field regularizations

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Published Papers (5 papers)

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Research

13 pages, 6316 KiB  
Article
Research on Tunnel-Boring Machine Main Bearing Fatigue Damage and Vibration Response
by Hongliang Zhang and Chuanyong Qu
Metals 2023, 13(4), 650; https://doi.org/10.3390/met13040650 - 25 Mar 2023
Cited by 3 | Viewed by 2320
Abstract
Based on the damage evolution equation of bearing steel, a user subroutine was developed to simulate the fatigue damage behavior of the TBM main bearing under the condition of low speed and heavy load. In addition, the damage evolution law of the main [...] Read more.
Based on the damage evolution equation of bearing steel, a user subroutine was developed to simulate the fatigue damage behavior of the TBM main bearing under the condition of low speed and heavy load. In addition, the damage evolution law of the main bearing in the time domain and the space domain was studied. Then, a nonlinear spring element was introduced to simulate the interaction between the roller raceway, and the vibration response of the TBM after the main bearing damage was studied using the transient dynamic method. The research shows that the damage risk of the raceway is greater than that of the roller, and the damage risk of the main pushing raceway is greater than that of the other two raceways. The damage of the main bearing will not only lead to the increase in the peak vibration response of the TBM but also cause more frequency components of the response. By monitoring the time domain index of vibration signal, the damage degree to the main bearing can be mastered in real time, providing a reference for the maintenance of the main bearing. Full article
(This article belongs to the Special Issue Computational Mechanics of Fatigue and Fracture in Metallic Materials)
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38 pages, 7813 KiB  
Article
Calculation of Durability and Fatigue Life Parameters of Structural Alloys Using a Multilevel Model of Acoustic Emission Pulse Flow
by Oleg G. Perveitalov, Viktor V. Nosov, Alexey I. Borovkov, Khanukh M. Khanukhov and Nikita V. Chetvertukhin
Metals 2023, 13(1), 4; https://doi.org/10.3390/met13010004 - 20 Dec 2022
Cited by 7 | Viewed by 2930
Abstract
The issues of durability and fatigue life of various structural materials occupy an important place in the operation of equipment and elements subjected to high stresses. To correctly predict its operation time, knowledge of the unique internal structure of a particular piece of [...] Read more.
The issues of durability and fatigue life of various structural materials occupy an important place in the operation of equipment and elements subjected to high stresses. To correctly predict its operation time, knowledge of the unique internal structure of a particular piece of operating equipment is required. To obtain such data, a multilevel model of acoustic emission signal flow is proposed in the article, which is based on the kinetic concept of strength and the selection of various stages of destruction in the kinetics of damage accumulation. The selected information, which accounts for the hypothesis of the linear summation of damage, is used in modern models for calculating fatigue life based on kinetic parameters, e.g., the activation energy of destruction and activation volume. The fracture activation energies, activation volume, destructive load, and fatigue life of various structural alloys and steels were calculated using the proposed acoustic emission model based on static test data from various scientific literature sources. For comparison, several methods of calculating kinetic parameters based on the thermal fluctuation concept of strength were used. In addition, numerical modeling was performed to select the structural lethargy coefficient from the elastic deformation zone. The results of the proposed model are in good agreement with the experimental data and allow—within the framework of more thorough tests and with a more accurate consideration of temperature—for the application of an engineering-based approach with which to evaluate the durability and residual service life of objects. Full article
(This article belongs to the Special Issue Computational Mechanics of Fatigue and Fracture in Metallic Materials)
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9 pages, 3536 KiB  
Article
Simulation of Stress Concentrations in Notches
by Vladimír Chmelko, Michal Harakaľ, Pavel Žlábek, Matúš Margetin and Róbert Ďurka
Metals 2022, 12(1), 43; https://doi.org/10.3390/met12010043 - 25 Dec 2021
Cited by 13 | Viewed by 3647
Abstract
The fatigue life curves of materials are very sensitive to the magnitude of the stress amplitude. A small change or inaccuracy in the determination of the stress value causes large changes or inaccuracies in the calculated fatigue life estimate. Therefore, the use of [...] Read more.
The fatigue life curves of materials are very sensitive to the magnitude of the stress amplitude. A small change or inaccuracy in the determination of the stress value causes large changes or inaccuracies in the calculated fatigue life estimate. Therefore, the use of computer simulations for fatigue life estimation requires a proper model development methodology. The paper is devoted to the problem of the modeling of components in notches using FEM. The modeling parameters significantly influencing the obtained stress results have been defined. Exact analytical solutions served as a benchmark for comparing the accuracy of the stress values obtained using FEM models. For the selected 2D and 3D notched components, diagrams were created for sensitivity analysis of the influence of the mesh element density at the root of the notch in correlation with the exact analytical solution. The findings from model building were applied to model the stress concentration at the root of a V-weld joint in a gas pipeline. Full article
(This article belongs to the Special Issue Computational Mechanics of Fatigue and Fracture in Metallic Materials)
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20 pages, 6573 KiB  
Article
Distortion-Induced Fatigue Reassessment of a Welded Bridge Detail Based on Structural Stress Methods
by Vencislau Quissanga, Guilherme Alencar, Abílio de Jesus, Rui Calçada and José Guilherme S. da Silva
Metals 2021, 11(12), 1952; https://doi.org/10.3390/met11121952 - 3 Dec 2021
Cited by 4 | Viewed by 3102
Abstract
Typically, bridge structural systems are affected by random loads that can cause significant damage. One challenging problem in this field is the high-stress amplitude associated with distortion-induced fatigue. In this study, the hot-spot method and the master S-N curve method were validated for [...] Read more.
Typically, bridge structural systems are affected by random loads that can cause significant damage. One challenging problem in this field is the high-stress amplitude associated with distortion-induced fatigue. In this study, the hot-spot method and the master S-N curve method were validated for the evaluation of fatigue resistance induced by distortion in welded joints of steel bridges. Validation of the master S-N curve method in this research was a necessary prior step for application of the method in real case studies of road bridges, which will be subject to loads of variable amplitudes in the near future, ensuring the basis for the application. The method of validation was based on an important available full-scale fatigue test database, which was generated decades ago to serve as the foundation for the assessment of distortion-induced fatigue. Modelling was carried out based on the finite element method with the aid of ANSYS software, considering the shell and solid elements and equivalent structural stresses. The experimental results were compared with the numerical ones obtained with the two methodologies, and the difference, in terms of global and local tension, was less than 1%. Full article
(This article belongs to the Special Issue Computational Mechanics of Fatigue and Fracture in Metallic Materials)
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12 pages, 3064 KiB  
Article
Lifetime Assessment for Multiaxial High-Cycle Fatigue Using Twin-Shear Unified Yield Criteria
by Haoran Li, Jiadong Wang, Juncheng Wang, Ming Hu and Yan Peng
Metals 2021, 11(8), 1178; https://doi.org/10.3390/met11081178 - 24 Jul 2021
Cited by 1 | Viewed by 1876
Abstract
In this paper, a life prediction model associated with maximum principal stress and equivalent shear amplitude based on twin-shear unified yield criterion for multiaxial high-cycle fatigue is proposed. The equivalent shear amplitude is the normalized format of the equivalent shear amplitude based on [...] Read more.
In this paper, a life prediction model associated with maximum principal stress and equivalent shear amplitude based on twin-shear unified yield criterion for multiaxial high-cycle fatigue is proposed. The equivalent shear amplitude is the normalized format of the equivalent shear amplitude based on clusters of yield criteria embodying Tresca and the linearization of Huber-von Mises, extending the application to metallic materials. Simultaneously, the effect of mean stress on multiaxial high-cycle fatigue is considered in the proposed model. As an assessment of the new prediction model, the criterion is compared with experimental data of aluminum alloy LY12CZ and carbon structural steel SM45C published in the relevant literature, which shows that most of the data are located within an error range of less than two times the data and are in good agreement with the experiment. Moreover, the proposed model is also compared with other models, such as McDiarmid, Liu, and Freitas, to validate its competitiveness. Full article
(This article belongs to the Special Issue Computational Mechanics of Fatigue and Fracture in Metallic Materials)
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