Special Issue "Materials Investigations in Mechanical Systems"

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

Deadline for manuscript submissions: 31 December 2021.

Special Issue Editors

Prof. Dr. Jan Awrejcewicz
E-Mail Website
Guest Editor
Faculty of Mechanical Engineering, Lodz University of Technology, 90-924 Łódź, Poland
Interests: nonlinear dynamics; non-linear mechanics; control; biomechanics; mechatronics
Special Issues and Collections in MDPI journals
Prof. Dr. Virgil-Florin Duma
E-Mail Website1 Website2
Guest Editor
3OM Optomechatronics Group, Faculty of Engineering, Aurel Vlaicu University of Arad, Arad, Romania
Doctoral School, Polytechnic University of Timisoara, Timisoara, Romania
Interests: optomechatronics; laser systems; imaging techniques; optical coherence tomography (OCT); measuring systems; optical metrology
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

Material studies play an essential role in all fields of mechanical and mechatronic engineering. They are performed with a wide range of methods, including analytical, numerical and experimental investigation and control. The aim of this Special Issue is to provide a forum for high-impact researches performed in material studies considering most diverse applications that include but are not limited to mechanical engineerning, airplane and rocket industries, land and water transport, sensors modelling and fabrication, mechatronics, and robotics.

Of special interest are applications related to the strength of materials (with approaches that include finite element analysis (FEA)), and the characterization of mechanical parameters (the latter include nonmechanical methods, for example, optical methods). Development and testing of systems for performing material studies are also encouraged. Optimization problems based on such approaches are especially sought.    

The core interest of this SI relies on modelling, computation, and experimental investigation of engineering materials, with an emphasis on the mechanical static and dynamic characterization of their properties. The covered topics include metallic materials, composite materials, fibres, micro-/nano-scale martials, optical and magnetic materials, as well as materials used in biomechanics.

Articles promoting modern materials modelling and design based on the theoretical progress of both mechanics and material science offering modern avenues of application and technology are welcome.

Prof. Dr.-habil. Jan Awrejcewicz
Prof. Dr.-habil. Virgil-Florin Duma
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 papers will be 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 2000 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

  • Materials studies
  • Strength of materials
  • Finite element analysis (FEA)
  • Mechanical engineering
  • Numerical simulations
  • Experimental studies
  • Imaging techniques
  • Modeling of advanced materials.

Published Papers (5 papers)

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Research

Open AccessArticle
Stability Improvement of Flexible Shallow Shells Using Neutron Radiation
Materials 2020, 13(14), 3187; https://doi.org/10.3390/ma13143187 - 16 Jul 2020
Viewed by 498
Abstract
Microelectromechanical systems (MEMS) are increasingly playing a significant role in the aviation industry and space exploration. Moreover, there is a need to study the neutron radiation effect on the MEMS structural members and the MEMS devices reliability in general. Experiments with MEMS structural [...] Read more.
Microelectromechanical systems (MEMS) are increasingly playing a significant role in the aviation industry and space exploration. Moreover, there is a need to study the neutron radiation effect on the MEMS structural members and the MEMS devices reliability in general. Experiments with MEMS structural members showed changes in their operation after exposure to neutron radiation. In this study, the neutron irradiation effect on the flexible MEMS resonators’ stability in the form of shallow rectangular shells is investigated. The theory of flexible rectangular shallow shells under the influence of both neutron irradiation and temperature field is developed. It consists of three components. First, the theory of flexible rectangular shallow shells under neutron radiation in temperature field was considered based on the Kirchhoff hypothesis and energetic Hamilton principle. Second, the theory of plasticity relaxation and cyclic loading were taken into account. Third, the Birger method of variable parameters was employed. The derived mathematical model was solved using both the finite difference method and the Bubnov–Galerkin method of higher approximations. It was established based on a few numeric examples that the irradiation direction of the MEMS structural members significantly affects the magnitude and shape of the plastic deformations’ distribution, as well as the forces magnitude in the shell middle surface, although qualitatively with the same deflection the diagrams of the main investigated functions were similar. Full article
(This article belongs to the Special Issue Materials Investigations in Mechanical Systems)
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Open AccessArticle
Dynamic Mechanical Response and Damage Mechanism of HTPB Propellant under Impact Loading
Materials 2020, 13(13), 3031; https://doi.org/10.3390/ma13133031 - 07 Jul 2020
Cited by 3 | Viewed by 609
Abstract
The dynamic mechanical behaviors of Hydroxyl-terminated polybutadiene (HTPB) propellant was studied by a split Hopkinson pressure bar apparatus (SHPB) at strain rates ranging from 103 to 104 s−1. The obtained stress–strain curves indicated that the mechanical features, such as [...] Read more.
The dynamic mechanical behaviors of Hydroxyl-terminated polybutadiene (HTPB) propellant was studied by a split Hopkinson pressure bar apparatus (SHPB) at strain rates ranging from 103 to 104 s−1. The obtained stress–strain curves indicated that the mechanical features, such as ultimate stress and strain energy, were strongly dependent on the strain rate. The real time deformation and fracture evolution of HTPB propellant were captured by a high-speed digital camera accompanied with an SHPB setup. Furthermore, microscopic observation for the post-test specimen was conducted to explore the different damage mechanisms under various conditions of impact loading. The dominated damage characteristics of HTPB propellant were changed from debonding and matrix tearing to multiple cracking modes of ammonium perchlorate (AP) particles, along with the increase of the strain rate. For the first time, the influence of AP particle density on the dynamic response of HTPB propellant was studied by analyzing the strain-rate sensitivity (SRS) index of HTPB propellant with two different filler content (80 wt.% and 85 wt.%), which deduced from a power function of ultimate stress and strain energy density. The result of this study is of significance for evaluating the structural integrity and security of HTPB propellant. Full article
(This article belongs to the Special Issue Materials Investigations in Mechanical Systems)
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Open AccessArticle
Band Gaps and Transmission Characteristics Analysis on a Two-Dimensional Multiple-Scatter Phononic Crystal Structure
Materials 2020, 13(9), 2106; https://doi.org/10.3390/ma13092106 - 02 May 2020
Cited by 1 | Viewed by 580
Abstract
In this paper, a novel wrap-around multi-scattering phononic crystal (PC) structure is proposed. Band gaps (BGs) and transmission characteristics of the present structure are calculated using finite element method (FEM). Through the calculations of single-scattering prototype, three complete BGs which are exhibited at [...] Read more.
In this paper, a novel wrap-around multi-scattering phononic crystal (PC) structure is proposed. Band gaps (BGs) and transmission characteristics of the present structure are calculated using finite element method (FEM). Through the calculations of single-scattering prototype, three complete BGs which are exhibited at low frequency and the fourth wide BG at high frequency are discovered. The transmission features and resonant spectra represented by frequency response function (FRF) shows that apparent resonance directly cause the four specific BGs. By keeping the total area of scatterers unchanged, 2 × 2, 3 × 3 and 4 × 4 scatterers are designed to obtain the change rule of BGs. Furthermore, the size ratio of 2 × 2 scatterers, the number of connection beams are investigated to obtain the regular pattern of acoustic energy transmission and attenuation. The present investigation of multiple-scatter PC structure will provide a solid support on the future design of acoustical functional materials. Full article
(This article belongs to the Special Issue Materials Investigations in Mechanical Systems)
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Open AccessArticle
Decreasing Shear Stresses of the Solder Joints for Mechanical and Thermal Loads by Topological Optimization
Materials 2020, 13(8), 1862; https://doi.org/10.3390/ma13081862 - 15 Apr 2020
Viewed by 641
Abstract
A methodology for obtaining the optimal structure and distribution for the gradient properties of a material in order to reduce the stress level in a soldered joint was constructed. The developed methodology was based on a combination of topological optimization methods (the moving [...] Read more.
A methodology for obtaining the optimal structure and distribution for the gradient properties of a material in order to reduce the stress level in a soldered joint was constructed. The developed methodology was based on a combination of topological optimization methods (the moving asymptotes method) and the finite elements method; it was first implemented to solve problems of optimizing soldered joints. Using the proposed methodology, a number of problems were solved, allowing one to obtain optimal structural characteristics, in which a decrease in stress is revealed. Designing compounds using this technique will provide more robust designs. The proposed technique can be applied to a wide class of practical problems. Full article
(This article belongs to the Special Issue Materials Investigations in Mechanical Systems)
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Open AccessArticle
The Examination of Restrained Joints Created in the Process of Multi-Material FFF Additive Manufacturing Technology
Materials 2020, 13(4), 903; https://doi.org/10.3390/ma13040903 - 18 Feb 2020
Cited by 9 | Viewed by 996
Abstract
The paper is focused on the examination of the internal quality of joints created in a multi-material additive manufacturing process. The main part of the work focuses on experimental production and non-destructive testing of restrained joints of modified PLA (polylactic acid) and ABS [...] Read more.
The paper is focused on the examination of the internal quality of joints created in a multi-material additive manufacturing process. The main part of the work focuses on experimental production and non-destructive testing of restrained joints of modified PLA (polylactic acid) and ABS (Acrylonitrile butadiene styrene) three-dimensional (3D)-printed on RepRap 3D device that works on the “open source” principle. The article presents the outcomes of a non-destructive materials test in the form of the data from the Laser Amplified Ultrasonography, microscopic observations of the joints area and tensile tests of the specially designed samples. The samples with designed joints were additively manufactured of two materials: Specially blended PLA (Market name—PLA Tough) and conventionally made ABS. The tests are mainly focused on the determination of the quality of material connection in the joints area. Based on the results obtained, the samples made of two materials were compared in the end to establish which produced material joint is stronger and have a lower amount of defects. Full article
(This article belongs to the Special Issue Materials Investigations in Mechanical Systems)
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