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Mechanical Properties of Thin Coatings, Composites and Nanomaterials
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Mechanical Properties of Thin Coatings, Composites and Nanomaterials

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

Deadline for manuscript submissions: 20 April 2025 | Viewed by 3147

Special Issue Editors

Prof. Dr. Jorge M. Antunes

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Guest Editor
1. Centre for Mechanical Engineering, Materials and Processes, University of Coimbra Department of Mechanical Engineering Polo II, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal
2. Escola Superior de Tecnologia de Abrantes, Instituto Politécnico de Tomar, Rua 17 de Agosto de, 1808-2200 Abrantes, Portugal
Interests: mechanical properties of bulk materials and thin films: modelling and numerical simulation, inverse analysis and experimental aspects; mechanical properties of nanomaterials: modelling and experimental aspects
Special Issues, Collections and Topics in MDPI journals
Dr. Nataliya A. Sakharova

E-Mail Website
Guest Editor
CEMMPRE, Centre for Mechanical Engineering, Materials and Processes, Department of Mechanical Engineering Polo II, University of Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal
Interests: mechanical properties of bulk materials and thin films: modelling and numerical simulation, inverse analysis and experimental aspects; experimental mechanical characterization of materials: mechanical tests and structural studies by different techniques; mechanical properties of nanomaterials: modelling and experimental aspects; metal forming: fundamental aspects, modelling, constitutive laws, inverse analysis, numerical simulation and applications.
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The increasing use of thin coatings and composite materials in the numerous fields of industry and technology gives rise to the necessity of developing methodologies for evaluating their mechanical properties in order to predict their performance during technological processes. The depth-sensing indentation (DSI) test is a widely used technique for determining the mechanical properties of thin coatings and composite materials. The DSI technique allows the evaluation not only of the hardness but also of other mechanical properties, such as the Young’s modulus, the residual stresses, the yield stress, and the strain-hardening parameter. This Special Issue will focus on the methods and procedures that can be used in experimental and numerical DSI tests and contribute to the evaluation of the mechanical properties of thin films and composite materials, paying special attention to nanocomposites, i.e., those reinforced with nanoparticles, nanotubes, or nanofibers.

Furthermore, the aim of this Special Issue is to gather recent achievements towards the experimental characterization and modelling of the mechanical behaviour of nanocomposites, including, but not limited to, those reinforced with carbon nanotubes.

Contributions to the modelling and numerical simulation of the mechanical behaviour of carbon and non-carbon nanotubes and nanofibers, which are helpful in the design methodologies for producing nanocomposites, are also welcome.

Prof. Dr. Jorge M. Antunes
Dr. Nataliya A. Sakharova
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

  • thin coatings
  • composite materials
  • depth-sensing indentation (DSI) test
  • nanoindentation
  • nanocomposites
  • nanotubes
  • modelling
  • numerical simulation
  • mechanical tests
  • mechanical properties

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Published Papers (3 papers)

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Research

19 pages, 10468 KiB  
Article
Micronized Shell-Bioaggregates as Mechanical Reinforcement in Organic Coatings
by Francisco Javier Rodríguez-Gómez, Massimo Calovi and Stefano Rossi
Materials 2024, 17(16), 4134; https://doi.org/10.3390/ma17164134 - 21 Aug 2024
Viewed by 481
Abstract
Shells are primarily composed of calcite and aragonite, making the inclusion of micronized shells as bio-based fillers in organic coatings a potential means to enhance the mechanical properties of the layers. A water-based coating was reinforced with 5 wt.% Acanthocardia tuberculata powder, 5 [...] Read more.
Shells are primarily composed of calcite and aragonite, making the inclusion of micronized shells as bio-based fillers in organic coatings a potential means to enhance the mechanical properties of the layers. A water-based coating was reinforced with 5 wt.% Acanthocardia tuberculata powder, 5 wt.% Mytilus galloprovincialis powder, and 5 wt.% of an LDPE/ceramic/nanoceramic composite. An improvement in abrasion resistance was achieved using micronized seashells, as demonstrated by the Taber test (evaluating both weight loss and thickness reduction). Additionally, Buchholz hardness improved with powders derived from Mytilus galloprovincialis. No significant differences were observed among the samples in terms of color and gloss after 200 h of UV-B exposure. However, the delamination length from the scratch after 168 h of exposure in a salt spray chamber indicated that the addition of particles to the polymeric matrix resulted in premature degradation, likely due to the formation of preferential paths for water penetration from the scratch. This hypothesis was supported by electrochemical impedance spectroscopy measurements, which revealed a decrease in total impedance at 0.01 Hz shortly after immersion in a 3.5% NaCl solution. In conclusion, the particle size and shape of the micronized shells improved abrasion resistance without altering color and gloss but led to a decrease in the coating’s isolation properties. Full article
(This article belongs to the Special Issue Mechanical Properties of Thin Coatings, Composites and Nanomaterials)
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19 pages, 3374 KiB  
Article
Impact of the Curing Temperature on the Manufacturing Process of Multi-Nanoparticle-Reinforced Epoxy Matrix Composites
by João M. Parente, Rogério Simoes, Abilio P. Silva and Paulo N. B. Reis
Materials 2024, 17(8), 1930; https://doi.org/10.3390/ma17081930 - 22 Apr 2024
Viewed by 1030
Abstract
This study aims to analyze the effect of the curing temperature of nano-reinforcements during the manufacturing process on the mechanical properties of composites involving graphene (GNP), carbon nanofibers (CNFs), and a hybrid mixture of these two nanoparticles. In this context, the type of [...] Read more.
This study aims to analyze the effect of the curing temperature of nano-reinforcements during the manufacturing process on the mechanical properties of composites involving graphene (GNP), carbon nanofibers (CNFs), and a hybrid mixture of these two nanoparticles. In this context, the type of nanoparticles, their content, their type of resin, and their hybridization were considered. The results showed that both nanoparticles increased the viscosity of the resin suspension, with an increase of between 16.3% and 38.2% for GNP nanoparticles and 45.4% and 74% for CNFs depending on the type of resin. Shrinkage was also affected by the addition of nanoparticles, as the highest results were obtained with GNP nanoparticles, with a 91% increase compared with the neat resin, and the lowest results were obtained with CNFs, with a decrease of 77% compared with the neat resin. A curing temperature of 5 °C promoted the best bending and hardness performance for all composites regardless of the type of resin and reinforcement used, with improvements of up to 24.8% for GNP nanoparticles and 13.52% for CNFs compared with the neat resin at 20 °C. Hybridization led to further improvements in bending properties and hardness compared with single-reinforcement composites due to a synergistic effect. However, the effectiveness of hybridization depends on the type of resin. Full article
(This article belongs to the Special Issue Mechanical Properties of Thin Coatings, Composites and Nanomaterials)
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31 pages, 12073 KiB  
Article
Numerical Evaluation of the Elastic Moduli of AlN and GaN Nanosheets
by Nataliya A. Sakharova, Jorge M. Antunes, André F. G. Pereira, Bruno M. Chaparro, Tomás G. Parreira and José V. Fernandes
Materials 2024, 17(4), 799; https://doi.org/10.3390/ma17040799 - 7 Feb 2024
Viewed by 1281
Abstract
Two-dimensional (2D) nanostructures of aluminum nitride (AlN) and gallium nitride (GaN), called nanosheets, have a graphene-like atomic arrangement and represent novel materials with important upcoming applications in the fields of flexible electronics, optoelectronics, and strain engineering, among others. Knowledge of their mechanical behavior [...] Read more.
Two-dimensional (2D) nanostructures of aluminum nitride (AlN) and gallium nitride (GaN), called nanosheets, have a graphene-like atomic arrangement and represent novel materials with important upcoming applications in the fields of flexible electronics, optoelectronics, and strain engineering, among others. Knowledge of their mechanical behavior is key to the correct design and enhanced functioning of advanced 2D devices and systems based on aluminum nitride and gallium nitride nanosheets. With this background, the surface Young’s and shear moduli of AlN and GaN nanosheets over a wide range of aspect ratios were assessed using the nanoscale continuum model (NCM), also known as the molecular structural mechanics (MSM) approach. The NCM/MSM approach uses elastic beam elements to represent interatomic bonds and allows the elastic moduli of nanosheets to be evaluated in a simple way. The surface Young’s and shear moduli calculated in the current study contribute to building a reference for the evaluation of the elastic moduli of AlN and GaN nanosheets using the theoretical method. The results show that an analytical methodology can be used to assess the Young’s and shear moduli of aluminum nitride and gallium nitride nanosheets without the need for numerical simulation. An exploratory study was performed to adjust the input parameters of the numerical simulation, which led to good agreement with the results of elastic moduli available in the literature. The limitations of this method are also discussed. Full article
(This article belongs to the Special Issue Mechanical Properties of Thin Coatings, Composites and Nanomaterials)
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