Article
Materials Science, Ceramics
Zhuo Tian, Jianning Lu, Xiaowei Feng, Bo Feng, Cuicui Yin, Yingfei Lin, Juan Wang
Summary: By optimizing the size and arrangement of h-BN grains, ceramic materials with high thermal conductivity or high strength can be obtained by fully utilizing the anisotropic characteristics of h-BN ceramics. The effect of grain orientation distribution on the mechanical and thermal properties of materials was studied using the index of orientation distribution (IOP) to quantitatively characterize the orientation degree of h-BN grains, and the effect of h-BN grain size on material properties was analyzed. The results show that when the initial h-BN size is 13.50 um, the ceramic has the highest orientation degree/-507 and exhibits obvious anisotropy in mechanical and thermal properties. The related properties of BN-YAG ceramics vary significantly with the decrease of initial h-BN grain size.
CERAMICS INTERNATIONAL
(2023)
Article
Forestry
Dongxia Yang, Changsheng Fan
Summary: This paper studies the mechanical properties of wood-based sandwich structures and finds that the apparent density of the structures is lower but the overall flat compressive strength is higher. The design of the core layer plays a significant role in the mechanical properties and failure modes of the structures.
Review
Chemistry, Multidisciplinary
Yuri Golovin, Alexander A. Gusev, Dmitry Yu Golovin, Sergey M. Matveev, Inna A. Vasyukova
Summary: This review discusses the methods and results of studying the mechanical properties of wood at different scales, ranging from nano- to macro-scale. It reveals the size effects in the mechanical properties of wood, showing that smaller size correlates with stronger properties, which is consistent with other cellulose-containing materials. The possible mechanisms of size effects in wood are discussed, along with the correlations between mechanical and thermophysical properties. Examples are given to demonstrate the use of contactless thermographic express methods to predict the macromechanical properties of wood. The research technique for dendrochronological and dendroclimatological studies using microhardness and Young's modulus radial dependences in annual growth rings is also described.
Article
Physics, Condensed Matter
Khandaker Monower Hossain, Sohail Ahmad, S. K. Mitro
Summary: This study utilizes density functional theory to investigate the physical properties of BaTi1-xCrxO3, and explores the doping effects of Cr. The lattice parameters of BaTiO3 increase with increased Cr incorporation, and the material becomes increasingly brittle. The machinability of the pure phase is slightly better than that of doped phases. In addition, the doping level shows a slight increase in elastic anisotropy.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Forestry
Hiroaki Horiyama, Yuka Miyoshi, Keisuke Kojiro, Yuzo Furuta
Summary: This study conducted dynamic mechanical analysis on water-saturated earlywood and latewood of various wood species to investigate the differences in thermal softening properties. The results showed that there were variations in peak temperature and anisotropy in thermal softening properties among different wood species.
JOURNAL OF WOOD SCIENCE
(2023)
Article
Engineering, Multidisciplinary
LingBo Li, Fan Yang, Peng Wang, ZhengMiao Guo
Summary: This paper presents a hybrid octagonal simple-cubic (OSC) lattice structure obtained by combining the bending-dominated octagonal lattice and the stretching-dominated SC lattice. Finite element (FE) numerical models and theoretical predictions are established to analyze the mechanical properties and compression behavior of the OSC lattice. The results show that the OSC lattice has significantly improved elastic modulus, compression strength, and energy absorption capacity compared to the octagonal and octet lattice structures.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Engineering, Multidisciplinary
Lando Mentrasti, Luisa Molari, Marco Fabiani
Summary: The paper discusses the constraints imposed by the positive definite character of strain energy on the values of Poisson's ratios in a linear elastic orthotropic constitutive law. By utilizing the reciprocity principle and conservation of energy, non-trivial constraints lead to a particularly expressive form of the domain of existence. The analysis establishes notable restrictions for the elastic behavior of orthotropic composite materials, especially in cases with significant differences in Young's moduli.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Qingde Li, Feng Chen, Tonghui Sang
Summary: The effects of impulse-cyclone drying technique on the UV-accelerated aging properties of HDPE/wood fiber composites were investigated. The results show that the addition of wood fibers treated by impulse-cyclone drying (220 degrees C) and A187 modification is effective in enhancing the anti-UV aging properties of the composites.
Article
Materials Science, Multidisciplinary
Arpon Biswas, Md Safin Alam, Aldina Sultana, Tanjun Ahmed, Md Saiduzzaman, Khandaker Monower Hossain
Summary: The study utilizes density functional theory to analyze the physical properties of Ba1-xBixTi1-xMnxO3 (x = 0, 0.3, and 0.4), revealing significant changes in band structure and mechanical properties due to metal doping, transitioning from brittle to ductile behavior. The investigation highlights the impact of metal doping on the elastic anisotropy of the materials.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Construction & Building Technology
Ayfer D. Cavdar, Husnu Yel, Sevda B. Torun
Summary: This study investigates the performance of microcrystalline cellulose (MCC) as a reinforcement in cementitious wood particle products. The addition of MCC to wood cement boards improves water absorption, shrinkage, and mechanical properties. The dispersion effect of MCC in the cement matrix is observed under the scanning electron microscope.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Chemistry, Physical
Huijuan Guo, Peihan Wang, Qiuyi Li, Guoying Liu, Qichang Fan, Gongbing Yue, Shuo Song, Shidong Zheng, Liang Wang, Yuanxin Guo
Summary: The CO2 emissions from the cement industry and waste wood chips are increasing due to the rapid growth of the construction industry. In this study, pine waste wood chips were mixed into cement-based materials to develop an environmentally-friendly, low thermal conductivity, and mechanically sound light cementitious composite material. Different cementitious binders, including sulfur aluminate cement, ordinary Portland cement, and granulated blast furnace slag, were used. The results showed that the strength, dry density, and thermal conductivity of the material decreased with the increase in the wood chip to binder ratio, while the shrinkage, water absorption, and pore size increased. Among the binders, the material prepared with slag exhibited the lowest thermal conductivity. From a low-cost and low-carbon emissions perspective, using granulated blast furnace slag as the binder was determined to be the best approach for preparing a light cementitious composite with waste wood chips.
Article
Green & Sustainable Science & Technology
Hao Sun, Tong Ji, Hongjie Bi, Xin Lin, Chen Chen, Min Xu, Liping Cai, Zhenhua Huang
Summary: A sustainable wood-derived conductive circuit with excellent flexibility, high mechanical performance, and high electrical conductivity has been prepared using wood nanotechnology, showing potential applications in the field of flexible electronics.
ADVANCED SUSTAINABLE SYSTEMS
(2021)
Article
Agricultural Engineering
J. Andrzejewski, M. Barczewski, D. Czarnecka-Komorowska, T. Rydzkowski, K. Gawdzinska, V. K. Thakur
Summary: This study developed sustainable polymeric materials with a polypropylene matrix reinforced with wood waste for structural applications. The new polymer biocomposites were evaluated for their mechanical and structural properties, showing a relationship between the susceptibility to multiple processing and changes in flow conditions and mechanical properties. The study aims to describe the relationship between these processes and the properties and structure of the new materials.
INDUSTRIAL CROPS AND PRODUCTS
(2024)
Article
Engineering, Manufacturing
Yuning Chen, Yamei Zhang, Yudong Xie, Zedi Zhang, Nemkumar Banthia
Summary: This study analyzes the pore structure alternations in 3D-printed geopolymer concrete (3DPGC) compared to cast concrete, and finds that 3DPGC has larger porosity, coarser pore size distribution, and higher pore surface area. The pulling stress during the extrusion process contributes to the pore elongation of printed concrete, leading to mechanical anisotropy. This research is important for improving the performance of 3D-printed concrete.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Biomedical
Daniel Yoon, Margrethe Ruding, Charlotte A. Guertler, Ruth J. Okamoto, Philip Bayly
Summary: The study aims to design, fabricate, and characterize hydrogel lattice structures with consistent, controllable, anisotropic mechanical properties. Lattices made of three different unit-cell types were printed using stereolithography (SLA) of polyethylene glycol diacrylate (PEGDA). The mechanical properties of the scaled lattices were measured in shear and compression and compared to those of the unscaled lattices.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Chemistry, Analytical
Robert Rusinek, Dominik Kmiecik, Marzena Gawrysiak-Witulska, Urszula Malaga-Tobola, Sylwester Tabor, Pavol Findura, Aleksander Siger, Marek Gancarz
Summary: The study aimed to investigate the loss of nutritional properties and changes in volatile compounds of rapeseed oil during heating. The results showed a positive correlation between prolonged heating and the reduction of oil quality, with the electronic nose responding to these changes.
Article
Engineering, Multidisciplinary
Robert Owsinski, Dorian S. Lachowicz, Cyprian T. Lachowicz, Roberto Gil, Adam Nieslony
Summary: LFW technology offers versatile use and high integrity joints, potentially contributing to sustainable engineering in the future. However, limited research on LFW of steel components and lack of information on fatigue strength and fracture behavior may hinder its wider industrial adoption.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2021)
Article
Chemistry, Physical
Robert Owsinski, Adam Nieslony
Summary: This paper presents experimental tests on an electromagnetic shaker with a specimen and additional weight attached, subjected to non-Gaussian random loads with varying kurtosis parameter values. The results show a significant decrease in fatigue life as kurtosis increases, while the standard deviation of the specimen load remains constant. Analysis on the fatigue effect of aluminum alloy 6082 reveals a lack of sensitivity of the numerical model to changes in the kurtosis parameter of random load distribution.
Review
Materials Science, Multidisciplinary
Julian M. E. Marques, Denis Benasciutti, Adam Nieslony, Janko Slavic
Summary: This paper provides an overview of fatigue testing systems for metals subjected to uniaxial and multiaxial random loadings in the high-cycle regime. Different testing systems are critically discussed and classified based on various features, with a focus on the relationship between applied input and resulting stress state in the specimen. The review aims to guide the classification of future equipment by highlighting analogies and differences among different layouts.
Article
Engineering, Mechanical
Adam Nieslony, Michal Bohm, Robert Owsinski
Summary: The study found that kurtosis and crest factor are more accurate indicators for describing the influence of load signal shape on material fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Energy & Fuels
Monika Komorowska, Marcin Niemiec, Jakub Sikora, Anna Szelag-Sikora, Zofia Grodek-Szostak, Pavol Findura, Hatice Gurgulu, Joanna Stuglik, Maciej Chowaniak, Atilgan Atilgan
Summary: This study assessed the environmental efficiency of using sheep's wool as a fertilizer in bean production in northern Kyrgyzstan. The findings showed that using sheep wool resulted in a 15% higher bean yield compared to mineral fertilizers, while reducing the carbon footprint by almost 10%, making it an environmentally justified choice.
Article
Chemistry, Physical
Adam Kalavsky, Adam Nieslony, Robert Hunady
Summary: This paper analyzes the influence of the Welch method on fatigue life estimation in the frequency domain. It examines the impact of parameters such as window size, weighting, and overlap on power spectral density (PSD) calculation and lifetime estimation. Four different reference PSD spectra are generated and tested to demonstrate the general validity of the conclusions. The study finds that the best configuration of Welch method parameters for fatigue calculations is selecting the smallest possible time window (up to 60% of observation length) and the largest possible overlap (at least 70% of window size).
Article
Chemistry, Physical
Vitaliy Vlasovets, Tatiana Vlasenko, Stepan Kovalyshyn, Taras Shchur, Oleksandra Bilovod, Lyudmila Shulga, Mariusz Lapka, Milan Koszel, Stanislaw Parafiniuk, Leszek Rydzak
Summary: This study focuses on the assessment of possible hypereutectoid steel carbide mesh crushing. The effect of modifiers on the crushing of the cementite mesh within crystallization was studied. Multi-stage normalizing with accelerated cool-down can achieve the desired carbide mesh crushing.
Article
Chemistry, Multidisciplinary
Zbigniew Kobus, Agnieszka Buczaj, Anna Pecyna, Jacek Kapica, Pavol Findura, Slawomir Kocira
Summary: The purpose of this study was to optimize the effect of particle size, time, and ultrasonic intensity on the extraction of phenolic compounds and energy efficiency. Response surface methodology was used to optimize the variables. The highest polyphenols yield was obtained with a particle size of 0.65 mm, extraction time of 13.14 min, and ultrasound intensity of 6.92 W center dot cm(-2), resulting in a maximum value of 15.24 mg GAE center dot g(-1) dry matter of hemp. The best conditions for energy efficiency were found with a particle size of approximately 0.5 mm, extraction time of 7.7 min, and ultrasound intensity of 1.8 W center dot cm(-2), yielding 10.14 mg GAE center dot g(-1) dry matter of hemp.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Marine
Michal Stosiak, Mykola Karpenko, Adam Deptula, Kamil Urbanowicz, Paulius Skackauskas, Anna Malgorzata Deptula, Algimantas Danilevicius, Sarunas Sukevicius, Mariusz Lapka
Summary: This paper discusses mechanical vibrations in the operating environment of hydraulic systems in marine engineering. It focuses on the effects of periodic vibrations on the amplitude-frequency spectrum in a marine hydraulic system. A modified mathematical model is used to analyze the impact of vibrations on the pressure pulsation spectrum with a proportional directional valve. The experimental results are presented and compared with the results from the mathematical model, and a proposal is made to limit vibrations in the directional control valve body.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Agronomy
Pavol Findura, Urszula Malaga-Tobola, Dariusz Kwasniewski, Mateusz Stasiak, Marek Gugala, Anna Sikorska, Marek Gancarz
INTERNATIONAL AGROPHYSICS
(2023)
Article
Chemistry, Physical
Michal Bohm, Adam Nieslony, Szymon Derda, Robert Owsinski, Miloslav Kepka, Ivana Zetkova, Miroslav Zetek, Sarka Houdkova, Mariusz Prazmowski
Summary: Currently, finding a reliable source for design S-N curves is crucial, especially for new 3D-printed materials, due to advancements in fatigue calculation models. Steel components obtained from 3D-printing are popular for important parts of dynamically loaded structures. EN 1.2709 tool steel is commonly used and exhibits good strength properties and high abrasion resistance with the ability to be hardened. However, research has shown that fatigue strength for this material may vary depending on the printing method, resulting in a wide range of fatigue life. This paper presents selected S-N curves and conclusions regarding the fatigue resistance of EN 1.2709 steel after printing using the selective laser melting method, particularly in the tension-compression state. A combined general mean reference and design fatigue curve is provided, incorporating experimental results and literature data for tension-compression loading, which can be used by engineers and scientists for fatigue life calculations using the finite element method.
Article
Agronomy
Elzbieta Radzka, Krzysztof Kapela, Robert Rusinek, Pavol Findura
Summary: This study assessed the water needs satisfaction of maize crops in central-eastern Poland using meteorological data from Institute of Meteorology and Water Management - National Research Institute (IMGW-PIB) stations. The results showed that water deficits were most frequent in May, with the highest values occurring in the Pultusk area. The Terespol area had the most satisfactory water demand meet for maize. Additionally, Siedlce and Terespol exhibited different trends in water deficits during specific months.
INTERNATIONAL AGROPHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Michal Stosiak, Paulius Skackauskas, Krzysztof Towarnicki, Adam Deptula, Anna Malgorzata Deptula, Krzysztof Praznowski, Zaneta Grzywacz, Mykola Karpenko, Kamil Urbanowicz, Mariusz Lapka
Summary: This paper investigates the impact of mechanical vibrations of different frequencies on a specific type of valve. The study demonstrates that a neural network can be employed to compress measurement data and determine the most important frequency range for describing the impact of mechanical vibrations on a micro-hydraulic overflow valve. Induction decision trees are utilized to determine key measurement points and important areas of dependence. An analysis is conducted to identify the intervals in which flow rate plays a decisive role for the entire amplitude and frequency spectrum.
Article
Transportation Science & Technology
Adam Deptula, Michal Stosiak, Mykola Karpenko, Mariusz Lapka
Summary: The methodology of graph theory has been widely used in mechanics, including the analysis of automatic transmissions. This paper presents ongoing research on the use of game tree graphs in automatic transmission analysis, and introduces the concept of black box ideas for dependency graphs to automatically generate simplified models and determine the optimal number of teeth.
TRANSPORT AND TELECOMMUNICATION JOURNAL
(2022)
