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Metals
Special Issues
Characterization and Modelling of Fracture and Fatigue in Metallic Materials
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Characterization and Modelling of Fracture and Fatigue 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 (30 November 2022) | Viewed by 6324

Special Issue Editors

Dr. Pavel Konopík

E-Mail Website
Guest Editor
COMTES FHT a.s., Průmyslová 995, 334 41 Dobřany, Czech Republic
Interests: fracture mechanics; fatigue and damage; small-size specimens; mechanical testing; DIC methods; stress triaxiality; ductile fracture
Prof. Dr. Jan Džugan

E-Mail Website
Guest Editor
COMTES FHT a.s., Průmyslová 995, 334 41 Dobřany, Czech Republic
Interests: mechanical testing; fracture toughness; small-size specimens; material models; local property determination; additive manufacturing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In order to ensure the prevention of sudden and catastrophic failures in industrial and civil metallic structures (such as pipes, vessels, machinery, engines, rotating components, automobiles, trains, turbine blades, ship hulls and bridges), numerous researchers have dedicated their studies to understanding the phenomena of fracture and fatigue for more than a century. During this time, the field of the fracture and failure of metallic materials has progressed significantly owing to the development of new theories, and advances in computational methods and experimental techniques, and corrective, diagnostic and preventive tools have matured. However, with the development of new materials, technologies and manufacturing processes, revolutionary advancements in the fracture and fatigue failure of metallic materials are required.

This Special Issue aims to collect a wide range of original contributions on various aspects of fatigue and fracture for metallic materials. Articles on both experimental and modelling aspects of fatigue and fracture related to the following topics are particularly welcomed:

  • Additively manufactured metals;
  • Functionally graded materials;
  • Advanced conventional metals;
  • Surface modification technological processes (e.g., laser shot peening);
  • Novel testing techniques and modeling for fracture and fatigue investigation (e.g., small sample test techniques and local approaches);
  • Local strain analyses by digital image correlation (DIC);
  • The modeling and simulation of degradation processes;
  • The structural integrity of metallic components;
  • Fatigue strength and fatigue limits;
  • Fatigue design (infinite lifetime, fail-safe, safe-life or damage tolerance concepts);
  • Metallic structural components containing defects;
  • Ductile damage (e.g., fracture locus determination, triaxiality and Lode angle influence on the failure);
  • Crack initiation and propagation under cyclic loading;
  • Fracture toughness assessment and its applications (e.g., subsize specimens and thin sheets);
  • New approaches for FLC/FLD diagrams;
  • Dynamic loading;
  • The improvement of material properties to increase resistance against brittle fracture.

Dr. Pavel Konopík
Prof. Dr. Jan Džugan
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 (fatigue strength, fatigue limits, fatigue design and analyses, etc.)
  • Fracture (brittle fracture, ductile fracture, fracture loci, FLC/FLD, failure analysis, etc.)
  • Fracture mechanics
  • Additive manufacturing
  • Functionally graded materials (FGMs)
  • Miniature specimens
  • Crashworthiness
  • Structural integrity
  • DIC technique
  • Material models
  • Notch sensitivity
  • Crack propagation
  • Metallic materials

Published Papers (3 papers)

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Research

10 pages, 6392 KiB  
Article
Digital Image Correlation Technique to Aid Monotonic and Cyclic Testing in a Noisy Environment during In Situ Electrochemical Hydrogen Charging
by Aleksander Omholt Myhre, Aleksander Sendrowicz, Antonio Alvaro and Alexei Vinogradov
Metals 2023, 13(1), 30; https://doi.org/10.3390/met13010030 - 22 Dec 2022
Cited by 2 | Viewed by 1385
Abstract
Hydrogen is receiving growing interest as an energy carrier to facilitate the shift to a green economy. However, hydrogen may cause the significant degradation of mechanical properties of structural materials, premature strain localisation, crack nucleation, and catastrophic fracture. Therefore, mechanical testing in hydrogenating [...] Read more.
Hydrogen is receiving growing interest as an energy carrier to facilitate the shift to a green economy. However, hydrogen may cause the significant degradation of mechanical properties of structural materials, premature strain localisation, crack nucleation, and catastrophic fracture. Therefore, mechanical testing in hydrogenating conditions plays a vital role in material integrity assessment. Digital image correlation (DIC) is a versatile optical technique that is ideally suited for studying local deformation distribution under external stimuli. However, during mechanical testing with in situ electrochemical hydrogen charging, gas bubbles inherent to hydrogen recombination are created at the sample surface, causing significant errors in the DIC measurements, and posing significant challenges to researchers and practitioners utilising this technique for testing in harsh environments. A postprocessing technique for the digital removal of gas bubbles is presented and validated for severe charging conditions (−1400 mV vs. Ag/AgCl) under monotonic and cyclic loading conditions. Displacement fields and strain measurements are produced from the filtered images. An example application for measuring the crack tip opening displacement during a slow strain rate tensile test is presented. The limitations of the technique and a comparison to other bubble mitigation techniques are briefly discussed. It was concluded that the proposed filtering technique is highly effective in the digital removal of gas bubbles during in situ electrochemical hydrogen charging, enabling the use of DIC when the sample surface is almost completely obscured by gas bubbles. Full article
(This article belongs to the Special Issue Characterization and Modelling of Fracture and Fatigue in Metallic Materials)
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18 pages, 6431 KiB  
Article
Simultaneous Improvement in Mechanical Properties and Fatigue Crack Propagation Resistance of Low Carbon Offshore Structural Steel EH36 by Cu–Cr Microalloying
by Xingdong Peng, Peng Zhang, Ke Hu, Ling Yan and Guanglong Li
Metals 2021, 11(11), 1880; https://doi.org/10.3390/met11111880 - 22 Nov 2021
Cited by 3 | Viewed by 1692
Abstract
Improving the mechanical performance of low-carbon offshore steel is of great significance in shipbuilding applications. In this paper, a new Cu-Cr microalloyed offshore structural steel (FH36) was developed based on EH36. The microstructure, mechanical properties, and fatigue crack propagation properties of rolled plates [...] Read more.
Improving the mechanical performance of low-carbon offshore steel is of great significance in shipbuilding applications. In this paper, a new Cu-Cr microalloyed offshore structural steel (FH36) was developed based on EH36. The microstructure, mechanical properties, and fatigue crack propagation properties of rolled plates of FH36, EH36, and normalizing rolled EH36 plates (EH36N) manufactured by a thermo-mechanical control process (TMCP) were analyzed and compared (to simplify, the two rolled specimens are signified by FH36T and EH36T, respectively). FH36T showed an obvious advantage in elongation with the value of 29%, 52.2% higher than the EH36T plates. The normalizing process led to a relatively lower yield stress (338 MPa), but substantially increased the elongation (33%) and lessened the yield ratio from 0.77 to 0.67. Electron back-scattered diffraction (EBSD) analysis showed that SFs of the deformation texture of FH36T and EH36N along the transverse direction (TD) and normal direction (ND) were much higher than those of the EH36T plate, which enhanced the lateral movement ability in the width and thickness direction, enhancing the ductility. Moreover, FH36 plates showed a better fatigue crack propagation resistance than rolled EH36 plates. The formation of the jagged shape grain boundaries is believed to induce a decrease of effective stress intensity factor during the fatigue crack propagation process. Full article
(This article belongs to the Special Issue Characterization and Modelling of Fracture and Fatigue in Metallic Materials)
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18 pages, 3133 KiB  
Article
A Methodology to Determine the Effective Plastic Zone Size Around Blunt V-Notches under Mixed Mode I/II Loading and Plane-Stress Conditions
by Ali Reza Torabi, Behnam Shahbazian, Mirmilad Mirsayar and Sergio Cicero
Metals 2021, 11(7), 1042; https://doi.org/10.3390/met11071042 - 29 Jun 2021
Cited by 6 | Viewed by 2400
Abstract
The determination of the ductile failure behavior in engineering components weakened by cracks and notches is greatly dependent on the estimation of the plastic zone size (PZS) and, particularly, the effective plastic zone size (EPZS). Usually, time-consuming complex elastic–plastic analyses are required for [...] Read more.
The determination of the ductile failure behavior in engineering components weakened by cracks and notches is greatly dependent on the estimation of the plastic zone size (PZS) and, particularly, the effective plastic zone size (EPZS). Usually, time-consuming complex elastic–plastic analyses are required for the determination of the EPZS. Such demanding procedures can be avoided by employing analytical methods and by taking advantage of linear elastic analyses. In this sense, this work proposed a methodology for determining the PZS around the tip of blunt V-notches subjected to mixed mode I/II loading and plane-stress conditions. With this aim, firstly, existing approximate mathematical expressions for the elastic stress field near round-tip V-notches reported in the literature are presented. Next, Irwin’s approach (fundamentally proposed for sharp cracks) and a yield criterion (von Mises or Tresca) were applied and are presented. With the aim of verifying the proposed methodology, elastic–plastic finite element analyses were performed on virtual AISI 304 steel V-notched specimens. It was shown that the analytical formulations presented cannot estimate the complete shape of the plastic zone. However, the EPZS, which is crucial for predicting the type of ductile failure in notched members, can be successfully estimated. Full article
(This article belongs to the Special Issue Characterization and Modelling of Fracture and Fatigue in Metallic Materials)
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