Article
Materials Science, Multidisciplinary
JongDae Hong, Daehyeok Ahn, Dongchan Jang, Hongryul Oh, JaeYong Kim, Hyochan Kim, Martin Sevecek
Summary: After the Fukushima accident, there has been a push to develop accident tolerant fuel (ATF) cladding to enhance safety under accident conditions. Many countries have focused on surface-modified Zr cladding, such as Cr or Cr-Al alloy coated Zr-alloy cladding, as a short-term solution. However, there is currently no mechanical properties data available for the thin coated layer. In this study, small scale mechanical test techniques were introduced to evaluate the mechanical properties of the thin coated layer, and the results showed that the measured properties were equivalent to the bulk properties, indicating the potential usefulness of these small-scale tests for reliable fuel performance assessment of coated ATF cladding.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Chemistry, Physical
Congcong Wu, Jun Peng, Weiwen Pu, Shengnan Lu, Chao Zhang, Nan Wu, Zhaoru Sun, Hongti Zhang, Hung-Ta Wang
Summary: The study found that alpha-Sb2O3 nanoflakes exhibit unique bending properties, with a low Young's modulus and remarkable maximum tensile strain, which are attributed to the high-symmetry vdW bonding structure. The vdW nanomechanics have fundamental and technological relevance to nanoelectronics.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Na Li, Lingwei Yang, Chuanyun Wang, M. A. Monclus, Dongfeng Shi, J. M. Molina-Aldareguia
Summary: The addition of Y element in Mg-2 wt.% Y alloy results in a more balanced deformation compared to pure Mg, with different mechanisms of deformation observed in basal slip, twin growth, and prismatic-slip favorable orientation. The high-temperature strengthening in Mg-Y alloy is mainly attributed to dislocation decomposition and Y segregation at stacking faults.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Ed Darnbrough, Jack Aspinall, Mauro Pasta, David E. J. Armstrong
Summary: In this paper, in-situ nanoindentation is used to investigate the anisotropic mechanical properties of metallic lithium, which is the desired anode material for high energy density solid state batteries. It is found that the elastic modulus and creep properties of lithium show a significant range depending on sample preparation and testing method. The study also reveals the impact of strain-rate and temperature on battery cycle performance. The global equation for yield strength with strain-rate is established to explain the variations in property values reported in the literature. These findings provide important insights for optimizing the design of solid state batteries and reducing the required pressure.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Characterization & Testing
Petra Christoefl, Caterina Czibula, Michael Berer, Gernot Oreski, Christian Teichert, Gerald Pinter
Summary: Instrumented nanoindentation was utilized to examine the viscoelastic properties of PMMA as an amorphous polymer model. Evaluation methods combining adhesive contact and empiric models were applied to determine the elastic moduli, and comparison with AFM-NI and compression tests were conducted. The results showed good agreement between NI and AFM-NI, with only slightly lower values obtained with the O&P based AFM-NI method.
Article
Engineering, Mechanical
Kyosuke Kishida, Zhenghao Chen, Hirotaka Matsunoshita, Takuto Maruyama, Takayoshi Fukuyama, Yuta Sasai, Haruyuki Inui, Martin Heilmaier
Summary: The plastic deformation behavior of Mo5Si3 crystals was investigated under different conditions, revealing the influence of temperature and crystal orientation on the plastic behavior. It was found that the brittleness at room temperature is mainly due to the difficulty in dislocation motion.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Chemistry, Physical
S. Baco, Q. A. Abbas, T. J. Hayward, N. A. Morley
Summary: This study investigated the mechanical properties of soft magnetostrictive FeCoCr films, showing that the addition of Cr atoms improved the yield strength while decreasing the hardness and Young's modulus of the films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Chemistry, Multidisciplinary
Durga Prasad Karothu, Jad Mahmoud Halabi, Ejaz Ahmed, Rodrigo Ferreira, Peter R. Spackman, Mark A. Spackman, Pance Naumov
Summary: This paper summarizes the mechanical properties of organic crystals over the past three decades and establishes a global mechanical property profile. Organic crystals occupy a specific region in the mechanical property-density space and can be used to predict and identify mechanically robust organic crystal materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Pharmacology & Pharmacy
Karsten Fluegel, Katharina Schmidt, Lena Mareczek, Michael Gaebe, Robert Hennig, Markus Thommes
Summary: The research found that the addition of drugs significantly impacts the brittleness of amorphous solid dispersions, while there is a strong correlation between contact angle and disintegration time of tablets. Thorough characterization of ASDs helps predict their performance during tablet compression and optimize the selection of excipients.
EUROPEAN JOURNAL OF PHARMACEUTICS AND BIOPHARMACEUTICS
(2021)
Article
Materials Science, Multidisciplinary
D. W. Wheeler, J. Zekonyte, R. J. K. Wood
Summary: Ce-La alloys exhibit solid solution hardening with increasing La content, resulting in higher hardness and elastic modulus values. Despite being prone to oxidation, the oxide layers on the alloys do not significantly affect nanoindentation measurements.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Kyosuke Kishida, Masaomi Okutani, Hirotaka Suzuki, Haruyuki Inui, Martin Heilmaier, Dierk Raabe
Summary: The deformation behavior of single crystals of the sigma-phase compound FeCr has been studied. Plastic flow is observed at room temperature for all loading axis orientations tested. Newly identified slip systems, in addition to the previously identified {110}[001] slip, are found to be operative at room temperature.
Review
Materials Science, Multidisciplinary
Pedro Poza, Miguel Angel Garrido-Maneiro
Summary: Cold spray (CS) is a solid-state processing technique for depositing coatings on bulk materials to improve functionality and extend service life. Coatings generated via CS exhibit similar properties to bulk materials.
PROGRESS IN MATERIALS SCIENCE
(2022)
Article
Green & Sustainable Science & Technology
Hanzhou Ye, Bright Asante, Goran Schmidt, Andreas Krause, Yang Zhang, Zhiming Yu
Summary: The interaction between geopolymer and wood cell wall in geopolymer-wood composites was investigated using SEM-EDS, UMSP, nanoindentation, and nanoscratch. It was found that lignin may migrate from the wood cell wall to the surface of the geopolymer and contribute to geopolymer production without damaging the wood cell wall. Geopolymer mineralized and hardened the surfaces of wood cell walls, and the width of the interaction region was approximately 7.65 & mu;m depending on the friction coefficients.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Materials Science, Multidisciplinary
G. H. Balbus, S. I. Rao, O. N. Senkov, E. J. Payton
Summary: Refractory multi-principal element alloys (RMPEAs) have great potential for high temperature structural applications and other extreme environments. Recent experiments and simulations have revealed the unusual deformation behavior of equiatomic MoNbTi alloy, which shows slip on higher order planes and slow movement of edge dislocations. In this study, micropillar compression and postmortem transmission electron microscopy were used to investigate the orientation-dependent deformation behavior of MoNbTi. The results indicate that kink-migration of screw dislocations is the dominant mechanism for deformation in this system. Additionally, an unusual orientation dependence of yield strength was observed, which can be attributed to the high stress required for slip on {110} type planes.
Article
Nanoscience & Nanotechnology
Sijia Shen, Hongbo Li, Yanxiang Liang, Chuanyun Wang, Jiahong Niu, Nanming Feng, Ning Zhang, Lingwei Yang
Summary: This work studied the microstructural evolution and mechanical properties of Ni/Al nanolaminates with varying Ni mole ratio. It was found that the strength of the nanolaminates was enhanced after heat-treatment. A novel NiAl3/Ni2Al3 nanolaminate structure formed when the Ni mole ratio was 0.40, resulting in maximized strength. A homogeneous nanocrystalline NiAl phase formed when the Ni mole ratio was 0.53, leading to excellent ductility and intermediate strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Plant Sciences
Barbora Vojackova, Jan Tippner, Petr Horacek, Vaclav Sebera, Ludek Praus, Robert Marik, Martin Brabec
Summary: The study utilizes finite element modeling and optical techniques to explore the interaction between stem and root-plate stiffness in trees, highlighting a significant correlation between root-plate stiffness and tree response. Analyzing defects in tree response emphasizes the importance of proper location for detecting strains and inclinations, especially in the case of asymmetrical defects.
URBAN FORESTRY & URBAN GREENING
(2021)
Article
Engineering, Manufacturing
Jakub Pernica, Michal Sustr, Petr Dostal, Martin Brabec, David Dobrocky
Summary: This study focuses on comparing the effect of different temperature nozzles in FFF technology on common materials, and evaluates the results through tensile testing of standard specimens.
MANUFACTURING TECHNOLOGY
(2021)
Article
Materials Science, Paper & Wood
Jakub Domeny, Martin Brabec, Radim Rousek, Lauri Rautkari, Petr Cermak
Summary: The study compared the effects of microwave and steam treatment on the immediate and permanent properties of wood, finding that microwave treatment increased wood plasticity similarly to steam treatment without causing permanent damage to wood structure. This suggests that microwave treatment is an efficient alternative to steaming for plasticizing moist wood.
Article
Construction & Building Technology
Filip Majstorovic, Vaclav Sebera, Marusa Mrak, Sabina Dolenec, Marco Wolf, Laetitia Marrot
Summary: This study investigates the effect of Portland cement replacement with metakaolin on the mechanical behavior of flax textile-reinforced cementitious matrices. The results show that replacing Portland cement with metakaolin improves the ductility of the cement-based composite material and prevents degradation and embrittlement of the flax fibers.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Forestry
Petr Cermak, Jan Baar, Jakub Domeny, Eva Vybohova, Radim Rousek, Petr Paril, Anna Oberle, Iveta Cabalova, Dominik Hess, Michal Vodak, Martin Brabec
Summary: The wood-water interactions of modified beech wood were studied, and the results showed that the extent of interaction depended on the thermal modification temperature and type of chemical modification. Thermally modified wood had lower water vapour absorption, with more severe treatments resulting in greater reduction. Acetylation had the greatest impact on water vapour absorption and dimensional stability. Modified wood also exhibited slower and gradual swelling compared to the reference specimens.
Article
Engineering, Mechanical
Frantisek Sebek, Petr Kubik, Jan Tippner, Martin Brabec
Summary: This study focuses on the accurate description of European beech wood under high strain rates to provide reliable input for the finite element method. The experiment was based on split Hopkinson tensile bar tests and pressure bar tests, considering the tensile-compressive failure asymmetry and stress triaxiality, to calibrate the orthotropic behavior of the wood. Continuum damage mechanics were applied to simulate crack propagation realistically within explicit finite elements.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Review
Materials Science, Coatings & Films
Pavel Rohan, Frantisek Lukac, Marie Kolarikova, Stanislav Krum, Jakub Hornik, Jaroslav Lukes, Josef Sepitka, Jiri Kuchar
Summary: Pulsed plasma transferred arc surfacing is a commonly used industrial technology for producing protective layers with high resistance to corrosion, high temperature, and wear. This study focuses on the fabrication and characterization of a titanium matrix based on B4C for improving wear resistance. The findings reveal that the B4C grains in the thick deposited layers partially dissolve in the titanium matrix, forming borides and carbides.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2022)
Article
Forestry
Jan Tippner, Jaromir Milch, Vaclav Sebera, Martin Brabec
Summary: This study aims to develop an accurate orthotropic elasto-plastic model for oak wood that can be used in finite element analysis, taking into account different moisture levels. Through experimental validation and error calibration, numerical material models were successfully developed to predict the oak's elasto-plastic response.
Article
Chemistry, Physical
Pavlo Bekhta, Ruslan Kozak, Jan Sedliacik, Vladimir Gryc, Vaclav Sebera, Liubov Bajzova, Jan Izdinsky
Summary: The aim of this study was to improve the properties of lightweight particleboards by veneering. The study confirmed that birch veneer can significantly improve the mechanical properties of lightweight particleboards.
Article
Polymer Science
Pavlo Bekhta, Ruslan Kozak, Vladimir Gryc, Vaclav Sebera, Jan Tippner
Summary: The volume of deadwood is increasing annually due to environmental changes, while wood-based board manufacturers are facing a shortage of conventional raw materials. This study aimed to explore the use of deadwood particles in particleboards and found that although using deadwood particles resulted in a deterioration of physical and mechanical properties, it could reduce the formaldehyde content in the boards.
Article
Forestry
Petr Kubik, Frantisek Sebek, Petr Krejci, Martin Brabec, Jan Tippner, Ondrej Dvoracek, Daniel Lechowicz, Stephan Frybort
Summary: Hardwood species are becoming increasingly important as a sustainable building material due to global temperature changes and conifer pests. This article focuses on the disintegration process of European beech and uses experimental and finite element methods to model the process. The computationally predicted results show good agreement with the experiments, indicating that the model can be used for further investigations.
WOOD SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Paper & Wood
Jaka Gasper Pecnik, Andreja Pondelak, Michael David Burnard, Vaclay Sebera
Summary: Single edge-notched three-point bending tests were used to evaluate the fracture properties of adhesive bondlines in European beech. The results showed that epoxy adhesive had the highest fracture performance under standard climate conditions, and elevated temperatures resulted in reduced fracture performance.
WOOD MATERIAL SCIENCE & ENGINEERING
(2023)
Proceedings Paper
Forestry
Martin Brabec, Jan Tippner, Jiri Valenta, Frantisek Sebek, Ondrej Dvoracek
Summary: The predicted increase of hardwoods in the forests of Central Europe will lead to a transformation of industrial processes from softwood to hardwood cutting technologies. This study systematically characterizes the high-speed linear and rotational cutting of hardwood, and builds numerical models based on experimental data. The findings highlight the differences and specificities of hardwood cutting compared to softwoods, and provide insights for optimizing high-speed cutting of hardwoods.
10TH HARDWOOD CONFERENCE PROCEEDINGS 2022
(2022)
Article
Forestry
Jan Baar, Martin Brabec, Richard Slavik, Petr Cermak
Summary: The study showed that thermal treatment combined with oil treatment had a greater impact on the properties of beech wood compared to thermal treatment alone. In some cases, the high effectiveness was only relative to the mass increase caused by high oil retention.
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2021)