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Investigations and Modelling of the Fracture Process in Metallic Materials
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Investigations and Modelling of the Fracture Process in Metallic Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: closed (10 May 2022) | Viewed by 8789

Special Issue Editor

Prof. Dr. Ihor Dzioba

E-Mail Website
Guest Editor
Faculty of Mechatronics and Machine Desing, Department of Machine Design Fundamentals, Kielce University of Technology, Aleja Tysiaclecia Panstwa Polskiego 7, 25-314 Kielce, Poland
Interests: fracture mechanics; experimental methods; numerical modeling; environment influence on materials state
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the current Special Issue, we propose to collect articles on modern methods used in the analysis of the fracture process of metals and their alloys. The problem of accurate analysis of the cracking process is very important because it allows us to understand the mechanisms of crack formation and development in structural elements made of metals. This, in turn, allows us to assess the strength of the elements at the design stage and after long-term service operation in high thermal influence, in corrosive environments and with an active hydrogen. Analysis of the fracture process requires a comprehensive approach—conducting research using various methods aimed at achieving a common goal. Experimental research supplemented with metallographic tests of material microstructure and fractographic ones of fracture surface provides information which is necessary to create numerical models. Calculations of mechanical field distributions made during the simulation of the load of the tested specimens allows us to determine the critical levels of stress and strain field characteristics—the stress triaxility factor, the equivalent plastic strain, and the Lode factor. The comparison of the critical characteristics to those that occur in the tested elements will allow assessing its current state and estimating the remaining time of use. Nondestructive methods of testing—ultrasonic, acoustic emission, and others—also play an important role, allowing for the identification of defects in structural elements and tracking their development during operation.

In this Special Issue are welcome articles that comprehensively consider the problem of the cracking process of metal materials, and articles in which contemporary research methods regarding individual stages of the fracture process are presented.

Prof. Dr. Ihor Dzioba
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

  • fracture process
  • testing methods
  • numerical modeling
  • environment influence

Published Papers (5 papers)

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Research

25 pages, 8977 KiB  
Article
Identification of the Fracture Process in Gas Pipeline Steel Based on the Analysis of AE Signals
by Grzegorz Świt, Ihor Dzioba, Anna Adamczak-Bugno and Aleksandra Krampikowska
Materials 2022, 15(7), 2659; https://doi.org/10.3390/ma15072659 - 4 Apr 2022
Cited by 2 | Viewed by 1184
Abstract
The paper presents the results of tests conducted to identify the damage process in specimens collected from the steel of a gas pipeline. The tests concerned specimens made of S235 steel subject to quasi-static loading—uniaxial tension until failure. Acoustic emission (AE) signals were [...] Read more.
The paper presents the results of tests conducted to identify the damage process in specimens collected from the steel of a gas pipeline. The tests concerned specimens made of S235 steel subject to quasi-static loading—uniaxial tension until failure. Acoustic emission (AE) signals were recorded during the loading process along with force and elongation signals. Sections were collected from previously loaded specimens and subjected to microstructural examinations to determine the nature of material damage at different strain stages. The recorded AE signals were analyzed using the k-means clustering method, as well as time-frequency analysis. The results of metallographic tests and analysis of AE signals identified frequency spectra characteristic of different stages of the process of material damage. Full article
(This article belongs to the Special Issue Investigations and Modelling of the Fracture Process in Metallic Materials)
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17 pages, 7691 KiB  
Article
Evaluation of Corrosion, Mechanical Properties and Hydrogen Embrittlement of Casing Pipe Steels with Different Microstructure
by Olha Zvirko, Oleksandr Tsyrulnyk, Sebastian Lipiec and Ihor Dzioba
Materials 2021, 14(24), 7860; https://doi.org/10.3390/ma14247860 - 18 Dec 2021
Cited by 10 | Viewed by 2667
Abstract
In the research, the corrosion and mechanical properties, as well as susceptibility to hydrogen embrittlement, of two casing pipe steels were investigated in order to assess their serviceability in corrosive and hydrogenating environments under operation in oil and gas wells. Two carbon steels [...] Read more.
In the research, the corrosion and mechanical properties, as well as susceptibility to hydrogen embrittlement, of two casing pipe steels were investigated in order to assess their serviceability in corrosive and hydrogenating environments under operation in oil and gas wells. Two carbon steels with different microstructures were tested: the medium carbon steel (MCS) with bainitic microstructure and the medium-high carbon steel (MHCS) with ferrite–pearlite microstructure. The results showed that the corrosion resistance of the MHCS in CO2-containing acid chloride solution, simulating formation water, was significantly lower than that of the MCS, which was associated with microstructure features. The higher strength MCS with the dispersed microstructure was less susceptible to hydrogen embrittlement under preliminary electrolytic hydrogenation than the lower strength MHCS with the coarse-grained microstructure. To estimate the embrittlement of steels, the method of the FEM load simulation of the specimens with cracks was used. The constitutive relations of the true stress–strain of the tested steels were defined. The stress and strain dependences in the crack tip were calculated. It was found that the MHCS was characterized by the lower plasticity on the stage of the neck formation of the specimen and the lower fracture toughness than the other one. The obtained results demonstrating the limitations of the usage of casing pipes made of the MHCS with the coarse-grained ferrite/pearlite microstructure in corrosive and hydrogenating environments were discussed. Full article
(This article belongs to the Special Issue Investigations and Modelling of the Fracture Process in Metallic Materials)
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17 pages, 6319 KiB  
Article
Analytic Model of Maximal Experimental Value of Stress Intensity Factor KQ for AA2519–AA1050–Ti6Al4V Layered Material
by Maciej Kotyk
Materials 2020, 13(19), 4439; https://doi.org/10.3390/ma13194439 - 6 Oct 2020
Cited by 1 | Viewed by 1582
Abstract
The article presents the results of the author’s tests involving the determination of the maximal experimental value of the stress intensity factor KQ. This value was determined for a layered material obtained as the result of explosive welding of three alloys: [...] Read more.
The article presents the results of the author’s tests involving the determination of the maximal experimental value of the stress intensity factor KQ. This value was determined for a layered material obtained as the result of explosive welding of three alloys: AA2519, Ti6Al4V and AA1050, and separately for each material. In both cases tests were conducted for two temperatures—the ambient temperature (293 K), and cryogenic temperature (77 K). A model for initial assessment of the KQ value of AA2519–AA1050–Ti6Al4V (Al–Ti) layered material has also been presented. The proposed model has been developed so as to enable the determination of the curve course of load–COD for Al–Ti layered material using nominal stresses defined on the basis of a real load–COD course, obtained for the base materials, for both temperature conditions. Full article
(This article belongs to the Special Issue Investigations and Modelling of the Fracture Process in Metallic Materials)
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26 pages, 17258 KiB  
Article
Seismic Behavior of Extended End-Plate Connections Subjected to Cyclic Loading on the Top-Side of the Column
by Liang Luo, Jiangui Qin, Dongzhuo Zhao and Zhiwei Wu
Materials 2020, 13(17), 3724; https://doi.org/10.3390/ma13173724 - 23 Aug 2020
Cited by 9 | Viewed by 2652
Abstract
The extended end-plate connections provide excellent performance in resisting seismic loads in high-risk areas. Most scholars’ experiments and finite element studies on this type of joint are focused on the method of applying displacement loads on the beam tip, while the method of [...] Read more.
The extended end-plate connections provide excellent performance in resisting seismic loads in high-risk areas. Most scholars’ experiments and finite element studies on this type of joint are focused on the method of applying displacement loads on the beam tip, while the method of applying displacement on the column side has not been the subject of further study. However, the load transmission mechanism of this type of connection is not completely consistent in actual engineering, as the design concept of “strong column weak beam” does not apply to all joints. Therefore, in this paper, the lateral displacement of the applied column is used to simulate the seismic horizontal force to study the mechanical properties of the connection joints of the “weak column and strong beam” under the limit state of earthquake action. Based on the two internal columns (IC-EP1/2) and two edge columns (EC-EP1/2), the failure modes, strength, stiffness, moment–rotation curve, skeleton curve, ductility, and energy dissipation of this type of connection were studied. Experiment results indicated that this type of connection features semi-rigid and partial strength joints. The connection rotation angle of all specimens in the test exceeds 0.05 rad, which suggests it is an ideal seismic joints. Besides, the relationship between the thickness of the end-plate and the diameter of the bolt has a greater impact on the failure mode of the joint. The finite element (FE) analysis models were established for the above connection. The numerical model was validated against experimental results and showed acceptable consistency. Full article
(This article belongs to the Special Issue Investigations and Modelling of the Fracture Process in Metallic Materials)
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20 pages, 9408 KiB  
Article
Investigation of the Fracture Process of Explosively Welded AA2519–AA1050–Ti6Al4V Layered Material
by Dariusz Boroński, Ihor Dzioba, Maciej Kotyk, Aleksandra Krampikowska and Robert Pała
Materials 2020, 13(10), 2226; https://doi.org/10.3390/ma13102226 - 13 May 2020
Cited by 6 | Viewed by 1854
Abstract
The study presents an analysis of the cracking process of explosive welded layered material AA2519–AA1050–Ti6Al4V (Al–Ti laminate) at ambient (293 K) and reduced (223 and 77 K) temperatures. Fracture toughness tests were conducted for specimens made of base materials and Al–Ti laminate. As [...] Read more.
The study presents an analysis of the cracking process of explosive welded layered material AA2519–AA1050–Ti6Al4V (Al–Ti laminate) at ambient (293 K) and reduced (223 and 77 K) temperatures. Fracture toughness tests were conducted for specimens made of base materials and Al–Ti laminate. As a result of loading, delamination cracking occurred in the bonding layer of specimens made from Al–Ti laminate. To define the crack mechanisms that occur at the tested temperatures, a fracture analysis was made using a scanning electron microscope. Moreover, acoustic emission (AE) signals were recorded while loading. AE signals were segregated to link their groups with respective cracking process mechanisms. Numerical models of the tested specimens were developed, taking into account the complexity of the laminate structure and the ambiguity of the cracking process. A load simulation using the finite element method FEM allowed calculating stress distributions in the local area in the crack tip of the Al–Ti laminate specimens, which enabled the explanation of significant material cracking process development aspects. Results analysis showed an influence of interlayer delamination crack growth on the process of the Al–Ti laminate specimen cracking and the level of KQ characteristics at different temperatures. Full article
(This article belongs to the Special Issue Investigations and Modelling of the Fracture Process in Metallic Materials)
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