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Assessment of the Strength of Materials and Structure Elements
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Assessment of the Strength of Materials and Structure Elements

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

Deadline for manuscript submissions: 20 December 2025 | Viewed by 2297

Special Issue Editors

Prof. Dr. Ihor Dzioba

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Guest Editor
Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology, Av. 1000-An. of Polish State 7, 25-314 Kielce, Poland
Interests: fracture mechanics; strength and fracture toughness of materials; true stress–strain relationships; FEM analysis; in-service degradation of materials
Special Issues, Collections and Topics in MDPI journals
Dr. Sebastian Lipiec

E-Mail Website
Guest Editor
Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology, Av. 1000-An. of Polish State 7, 25-314 Kielce, Poland
Interests: fracture mechanics; FEM analysis; true relationship stress–strain; constitutive equations; fracture toughness
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In this Special Issue, we intend to include a number of articles presenting methods for assessing the material condition of structural components made of steel, including after long-term service. This issue is important because structural components exhibit pronounced microstructural anisotropy, resulting in variations in mechanical properties, which, in turn, affect the strength and integrity of structural components. Long-term operation at elevated temperatures and/or exposure to corrosive or hydrogen-forming environments leads to material degradation, reduced strength properties and fracture toughness, which can result in failure. Currently, various methods based on experimental studies of material characterization, microstructural determination, acoustic emission, numerical modelling and other techniques are used to assess material condition. 

In our Special Issue, we invite authors to publish their original research and analysis results on the assessment of current material conditions and the residual resurgence of structural elements estimated from experimental and numerical studies.

Prof. Dr. Ihor Dzioba
Dr. Sebastian Lipiec
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. 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

  • in-service degradation
  • microstructure
  • strength
  • fracture toughness
  • FEA simulations

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Published Papers (2 papers)

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Research

15 pages, 7843 KiB  
Article
Assessment of the Structural Integrity of the Portal Crane Elements After Long-Term Operation
by Ihor Dzioba, Olha Zvirko, Robert Pała and Oleksandr Oliynyk
Materials 2024, 17(24), 6133; https://doi.org/10.3390/ma17246133 - 15 Dec 2024
Viewed by 613
Abstract
Evaluating the current technical condition and residual life of structures that may have reached or exceeded the end of their design life is a challenging issue in many industrial sectors. This paper focuses on the assessment of the structural integrity of structural elements [...] Read more.
Evaluating the current technical condition and residual life of structures that may have reached or exceeded the end of their design life is a challenging issue in many industrial sectors. This paper focuses on the assessment of the structural integrity of structural elements of a seaport portal crane after operation for about 33 years. Test specimens were extracted from two crane elements, a jib (element A) as the most seriously loaded unit and, for comparison, a boom (element B) as the less loaded one, and machined in two different orientations, longitudinal and transversal. Both crane elements were made of a low-carbon rolled steel. The analysis was performed according to the FAD approach of FITNET Procedures. The basic level of analysis was used. For this purpose, the strength and fracture toughness characteristics of the steel from tested elements were determined experimentally. The strength and plasticity properties of the steel of both elements were similar. At the same time, the fracture toughness characteristics differ for the elements A and B and for the longitudinal and transverse specimen directions. The results of the FAD (FITNET) analysis performed for the elements containing a central crack loaded by tensile stress showed that they are not susceptible to failure. The relative length of cracks for which the critical state will be reached is also estimated. Full article
(This article belongs to the Special Issue Assessment of the Strength of Materials and Structure Elements)
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19 pages, 12138 KiB  
Article
Strength and Fracture Toughness of TIG- and Laser-Welded Joints of Low Carbon Ferritic Steels
by Tadeusz Pała and Wiktor Wciślik
Materials 2024, 17(16), 3956; https://doi.org/10.3390/ma17163956 - 9 Aug 2024
Cited by 1 | Viewed by 1359
Abstract
This paper presents the results of experimental testing of joints welded using conventional TIG and laser methods. The welded components were sheets of the low-carbon steels 13CrMo4-5 and 16Mo3. Welded joints were made using different levels of linear welding energy. In the case [...] Read more.
This paper presents the results of experimental testing of joints welded using conventional TIG and laser methods. The welded components were sheets of the low-carbon steels 13CrMo4-5 and 16Mo3. Welded joints were made using different levels of linear welding energy. In the case of laser welding, a bifocal beam with longitudinal positioning of the focal lengths in relation to the welding direction was used. Experimental tests on welded joints included a bending test and determination of hardness distribution, mechanical properties, and fracture toughness, as well as microstructural research in the material of the various joint zones. Based on the determined strength characteristics, the true stress–strain relationships were defined, and a numerical model of the laser joints was developed in Abaqus 6.12-3. The modelled joint was subjected to loading to determine the most stressed areas of the joints. The numerical results were compared with those obtained using GOM’s Aramis 3D 5M digital image correlation system. The system used made it possible to record displacements on the surface of the analysed joints in real time. Good agreement was obtained between the strain fields calculated numerically and those recorded using the Aramis 3D 5M video system. The numerical calculations provided information on the strains and stresses occurring inside the analysed joint during loading. It was found that the welded joints were characterised by increased hardness and high strength properties in relation to the base material. The bending test of the laser-welded joints gave a positive result—no cracks were observed on the face or root of the weld. The fracture toughness of the joint zones is slightly lower in relation to that of the base material, but no brittle fracture was observed. Full article
(This article belongs to the Special Issue Assessment of the Strength of Materials and Structure Elements)
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