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Research on Material Durability and Mechanical Properties
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Research on Material Durability and Mechanical Properties

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

Deadline for manuscript submissions: closed (10 April 2024) | Viewed by 4211

Special Issue Editors

Prof. Dr. Žilvinas Bazaras

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Guest Editor
Faculty of Mechanical Engineering and Design, Kaunas University of Technology, Studentų Str. 56, 44249 Kaunas, Lithuania
Interests: probabilistic and statistical methods; mechanical and cyclic properties of materials; durability of structures; low-cycle fatigue; railway transport and engineering
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Vaidas Lukoševičius

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Guest Editor
Faculty of Mechanical Engineering and Design, Kaunas University of Technology, Studentų Str. 56, 44249 Kaunas, Lithuania
Interests: vehicle crashworthiness; active and passive safety; vehicle dynamics and stability; vehicle suspension and tires; intelligent transport systems; vehicle energy efficiency; railway transport
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We would like to invite you to submit your research findings to a Special Issue of Materials, entitled ‘Research on Material Durability and Mechanical Properties’.

The constantly increasing demands for greater production capacities, speeds, load capacities and other parameters related to transport engineering facilities are associated with increasing levels of stress inside structural elements. To achieve the optimum results, challenges must be addressed first, including the improvement of the durability of structural elements in terms of strength criteria and achieving reductions in material consumption. Finding an appropriate combination of the lowest possible product weight and high strength is fairly complex. It is associated with various issues such as the heterogeneity of the chemical compositions, microstructures, surfaces, internal defects, etc., of the materials used production a product’s design. To reduce weight and costs, materials that exceed the proportional limit of plastic deformation have been intentionally developed. Therefore, it is essential that manufactured structures have high strength and are cost-effective and reliable. This can be achieved during the product design process by employing the most recent findings and achievements from studies regarding material properties.

The present issue is dedicated to providing an overview of advancements and new achievements in the science of material behaviour, as well as experimental, theoretical, and numerical materials research. Topics for publication can include the following (but are not limited to):

  • Mechanical and cyclic characteristics;
  • Cyclically hardening, cyclically softening, and cyclically stable materials;
  • Statistical characteristics and probability distributions;
  • Cyclic loading curve parameters;
  • Durability;
  • Fatigue;
  • Creep;
  • Fracture;
  • Shakedown and ratcheting;
  • Strength and durability in the crack zone;
  • Finite element method and numerical modelling;
  • Applications of materials for ground transport, railway and aerospace engineering.

Prof. Dr. Žilvinas Bazaras
Prof. Dr. Vaidas Lukoševičius
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

  • strength of materials
  • plasticity
  • durability
  • fatigue
  • creep
  • fracture
  • shakedown
  • ratcheting
  • experimental mechanics
  • finite element method

Published Papers (4 papers)

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Research

16 pages, 4324 KiB  
Article
Analysis of Mechanical Properties of Welded Joint Metal from TPP Steam Piping after Its Operational Degradation and Hydrogenation
by Volodymyr Hutsaylyuk, Oleksandra Student, Pavlo Maruschak, Halyna Krechkovska, Olha Zvirko, Lesya Svirska and Ivan Tsybailo
Materials 2023, 16(24), 7520; https://doi.org/10.3390/ma16247520 - 05 Dec 2023
Viewed by 857
Abstract
In this paper, the mechanical properties of various zones of the welded joints of a heat-resistant steel 15Kh1M1F in different states (in the initial state, after an operation on the main steam piping of a thermal power plant (TPP) for 23 years) were [...] Read more.
In this paper, the mechanical properties of various zones of the welded joints of a heat-resistant steel 15Kh1M1F in different states (in the initial state, after an operation on the main steam piping of a thermal power plant (TPP) for 23 years) were determined, and the fracture surfaces were analyzed using scanning electron microscopy (SEM) images. The effect of hydrogen electrolytic charging on mechanical behavior and fracture mechanism was also studied. The long-term operation of welds resulted in a higher degradation degree of the weld metal compared to the base one, indicated by the deterioration of mechanical properties: decrease in hardness, strength characteristics, and reduction in area, which was accompanied by an atypical increase in elongation at fracture. All studied zones of the operated welded joints were characterized by higher hydrogen content, 2.5–3 times higher than that in the initial state. Additional hydrogen charging of the weld joint metal led to a decrease in the strength and ductility characteristics, more significantly for the operated weld compared with the non-operated one. This justified the possibility of using short-term tests of hydrogenated WM in the air to assess the degree of its damage during operation on a steam piping. Full article
(This article belongs to the Special Issue Research on Material Durability and Mechanical Properties)
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18 pages, 8045 KiB  
Article
Development and Study of a New Silane Based Polyurethane Hybrid Flexible Adhesive—Part 1: Mechanical Characterization
by Vasco C. M. B. Rodrigues, Eduardo A. S. Marques, Ricardo J. C. Carbas, Michael Youngberg, Anne Dussaud, Reza Beygi and Lucas F. M. Da Silva
Materials 2023, 16(23), 7299; https://doi.org/10.3390/ma16237299 - 23 Nov 2023
Viewed by 807
Abstract
The need for more sustainable adhesive formulations has led to the use of silane-based adhesives in different industrial sectors, such as the automotive industry. In this work, the mechanical properties of a dual cure two-component prototype adhesive which combined silylated polyurethane resin (SPUR) [...] Read more.
The need for more sustainable adhesive formulations has led to the use of silane-based adhesives in different industrial sectors, such as the automotive industry. In this work, the mechanical properties of a dual cure two-component prototype adhesive which combined silylated polyurethane resin (SPUR) with standard epoxy resin was characterized under quasi-static conditions. The characterization process consisted of tensile bulk testing, to determine the Young’s modulus, the tensile strength and the tensile strain to failure. The shear stiffness and shear strength were measured by performing a thick adherend shear test. The in-plane strain field was obtained using a digital image correlation method. Double-cantilever beam and mixed-mode tests were performed to assess the fracture toughness under pure modes. The prototype adhesive showed promising but lower properties compared to commercial solutions. Furthermore, the adhesive was modified via the addition of three different resin modifier additives and characterized via measuring the shear and tensile properties, but no enhancements were found. Finally, the adhesive was formulated with three different SPUR viscosities. The critical energy release rate analysis showed an optimum value for the medium viscosity SPUR adhesive. Full article
(This article belongs to the Special Issue Research on Material Durability and Mechanical Properties)
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13 pages, 9529 KiB  
Article
The Development and Study of a New Silylated Polyurethane-Based Flexible Adhesive—Part 2: Joint Testing and Numerical Modelling
by Vasco C. M. B. Rodrigues, Eduardo A. S. Marques, Ricardo J. C. Carbas, Michael Youngberg, Anne Dussaud, Reza Beygi and Lucas F. M. da Silva
Materials 2023, 16(21), 7022; https://doi.org/10.3390/ma16217022 - 03 Nov 2023
Viewed by 751
Abstract
The need for more sustainable adhesive formulations has presented the possibility of using silane-based adhesives in the automotive industry. In this work, a dual-cure two-component silylated polyurethane resin (SPUR) adhesive was tested in single-lap joints, to assess in-joint behaviour at room temperature under [...] Read more.
The need for more sustainable adhesive formulations has presented the possibility of using silane-based adhesives in the automotive industry. In this work, a dual-cure two-component silylated polyurethane resin (SPUR) adhesive was tested in single-lap joints, to assess in-joint behaviour at room temperature under quasi-static conditions for aluminium substrates. The effect of two different overlap lengths, 25 and 50 mm, was also considered. A numerical model was built using cohesive zone modelling in finite element software, to reproduce the mechanical behaviour of the joint. The model was fed with data experimentally withdrawn from the first part of this paper. A triangular-shaped cohesive zone model (CZM) law was chosen as the adhesive behaviour was highly elastic and lacked yielding phenomena. The experimental results served as the base for the numerical validation, allowing accurate CZM parameters to be successfully determined. Full article
(This article belongs to the Special Issue Research on Material Durability and Mechanical Properties)
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15 pages, 4146 KiB  
Article
Energy Equivalence Based Estimation of Hybrid Composites Mechanical Properties
by Anna Jerzyńska and Halina Egner
Materials 2023, 16(12), 4215; https://doi.org/10.3390/ma16124215 - 06 Jun 2023
Viewed by 1041
Abstract
Hybrid composites, usually combining natural and synthetic reinforcing filaments, have gained a lot of attention due to their better properties than traditional two-component materials. For structural applications of hybrid composites, there is a need to precisely determine their mechanical properties on the basis [...] Read more.
Hybrid composites, usually combining natural and synthetic reinforcing filaments, have gained a lot of attention due to their better properties than traditional two-component materials. For structural applications of hybrid composites, there is a need to precisely determine their mechanical properties on the basis of the mechanical properties, volume fractions, and geometrical distributions of constituent materials. The most common methods, such as the rule of mixture, are inaccurate. More advanced methods, giving better results in the case of classic composites, are difficult to apply in the case of several types of reinforcement. In the present research, a new estimation method is considered, which is simple and accurate. The approach is based on the definition of two configurations: the real, heterogeneous, multi-phase hybrid composite configuration, and the fictitious, quasi-homogeneous one, in which the inclusions are “smeared out” over a representative volume. A hypothesis of the internal strain energy equivalence between the two configurations is formulated. The effect of reinforcing inclusions on the mechanical properties of a matrix material is expressed by functions of constituent properties, their volume fractions, and geometrical distribution. The analytical formulas are derived for an isotropic case of a hybrid composite reinforced with randomly distributed particles. The validation of the proposed approach is performed by comparing the estimated hybrid composite properties with the results of other methods, and with experimental data available in the literature. It is shown that a very good agreement is obtained between experimentally measured hybrid composite properties and their predictions resulting from the proposed estimation method. The estimation errors are much lower than the errors of other methods. Full article
(This article belongs to the Special Issue Research on Material Durability and Mechanical Properties)
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