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  1. 64 Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
  2. 39 International Agrophysics
  3. 38 Teka Komisji Motoryzacji i Energetyki Rolnictwa
  4. 32 Acta Agrophysica
  5. 18 Biuletyn Informacyjny Ośrodka Badawczo-Rozwojowego Przemysłu Płyt Drewnopochodnych w Czarnej Wodzie
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  1. 1 2024
  2. 5 2023
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  4. 11 2021
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  1. 19 Kowaluk G.
  2. 10 Borysiuk P.
  3. 10 Dziurka D.
  4. 10 Mirski R.
  5. 8 Auriga R.
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1
Content available Effects of SiC Coating of Carbon Fiber on Mechanical Properties in Short Carbon Fiber Reinforced Al Matrix Composite
100%
Jang J. M. , Ko S.-H. , Lee W.
Archives of Metallurgy and Materials
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2021
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tom Vol. 66, iss. 4
941--946
EN
A356 Al composites reinforced by short carbon fiber were prepared through the 2-step process: fabrication of a composite precursor and ultrasonication of the precursor melt. The short carbon fibers were coated with 0.15~1.5 μm thick SiC layer by a car-bothermal reaction, and an amount of the carbon fiber reinforcement was determined to be 1.5 vol.% and 4.0 vol.%, respectively. The addition of the carbon fiber increased the hardness of A356 alloy. However, tensile strength did not increase in the as-cast composites regardless of the SiC coating and volume fraction of the carbon fiber, due to the debonding which reduced load transfer efficiency from matrix to fiber at the interface. After T6-treatment of the composites, a significant increase in strength occurred only in the composite reinforced by the SiC-coated short carbon fiber, which was considered to result from the formation of a precipitate improving the Al/SiC interfacial strength.
2
Content available Study of Extrusion Temperature on Extrudability of Al-Zn-Cu Based Alloy
100%
Kim Y.-H. , Yoo H.-S. , Lee K.-S. , Lee S.-H. , Son H.-T.
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2020
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tom Vol. 65, iss. 4
1307--1310
EN
In this study, the extrusion characteristics of Al-2Zn-1Cu-0.5Mg-0.5RE alloys at 450, 500, and 550°C were investigated for the high formability of aluminum alloys. The melt was maintained at 720°C for 20 minutes, then poured into the mold at 200°C and hot-extruded with a 12 mm thickness bar at a ratio of 38:1. The average grain size was 175.5, 650.1, and 325.9 μm as the extrusion temperature increased to 450, 500 and 550°C, although the change of the phase fraction was not significant as the extrusion temperature increased. Cube texture increased with the increase of extrusion temperature to 450, 500 and 550°C. As the extrusion temperature increased, the electrical conductivity increased by 47.546, 47.592 and 47.725%IACS, and the tensile strength decreased to 92.6, 87.5, 81.4 MPa. Therefore, the extrusion temperature of Al extrusion specimen was investigated to study microstructure and mechanical properties.
3
Content available Teoreticheskie obosnovanie ispol'zovanija magnitnogo strukturnogo analiza dlja otsenki mekhanicheskikh svojjstv detalejj
100%
Vlasovec V. , Naymenko A. , Zaiec V.
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tom 17
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nr 7
4
Content available Effect of addition of waste pulp on selected mechanical properties of biplex board
100%
Modzelewska I. , Patelski E. , Smul W.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2014
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tom 87
5
The influence of low temperatures on the change of basic mechanical properties of chosen polyurethane elastomers used in agricultural machines
100%
Stezala S.
Annual Review of Agricultural Engineering
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2006
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tom 05
6
Content available Microstructure evolution and mechanical properties of underwater dry welded metal of high strength steel Q690E under different water depths
88%
Sun K. , Huc Y. , Shi Y. , Liao B.
Polish Maritime Research
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2020
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tom nr 4
112--119
EN
Q690E high strength low alloy (HSLA) steel has been intensively applied in maritime engineering. Also, the underwater dry welding (UDW) technique has been widely used to repair important offshore facilities. In this paper, joints of Q690E steel were fabricated through single-pass underwater dry welding at three pressures (0, 0.2, and 0.4 MPa). To study the effect of the pressure on the microstructure and mechanical properties of the UDW joint, an optical microscope (OM) and scanning electron microscope (SEM) were used to observe the microstructure and fracture morphology of the welded joints. The electron backscattered diffraction (EBSD) technique was used to analyse the crystallographic features and the crystallographic grain size of the ferrites. The proportion of acicular ferrite (AF) in the UDW joints and the density of low-angle boundaries increase dramatically with the increasing depth of water. The weld metal of UDW-40 shows higher strength because more fine ferrites and low-angle boundaries within UDW-40 impede the dislocation movement.
7
Content available Saturation criteria for heavy overconsolidated cohesive soils
88%
Lipinski M. J. , Wdowska M.
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
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2010
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tom 42
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nr 2
EN
The paper concerns significance of properly carried out saturation procedure and its role in evaluation of undrained response of heavy preconsolidated cohesive soils. In particular the saturation criteria are addressed which should be fulfilled during saturation of preconsolidated clay specimens of various plasticity. Influence of incomplete saturation on shear strength parameters is briefly characterized. On the basis of experimental data the back pressure method is shown to be the most efficient method in obtaining full saturation in overconsolidated clay of various plasticity. Analysis of the test results made possible to propose full saturation criteria for low, medium and high plasticity clays which are based on reduced value of Skempton’s B parameter.
PL
Jednym z najczęściej popełnianych błędów w laboratoryjnych badaniach właściwości mechanicznych gruntu jest niekontrolowany stan nasączenia gruntów. Artykuł dotyczy kryteriów, jakie powinny być spełnione podczas nasączania próbek różnych gruntów w badaniach trójosiowych. W pracy scharakteryzowano wpływ niepełnego wypełnienia porów gruntu wodą na błędy uzyskiwane w wynikach badań. Przedstawiono metodę ciśnienia wyrównawczego jako najbardziej skuteczny sposób doprowadzenia do pełnego nasycenia gruntu. Zaprezentowano wyniki badań dla prekonsolidowanych gruntów spoistych o różnej spoistości, tj. glin piaszczystych, glin i iłów. Analiza tych wyników pozwoliła na określenie minimalnych wartości parametru Skemptona B dla tych gruntów jakie powinny być spełnione dla otrzymania prawidłowej (niezafałszowanej) reakcji gruntu podczas ścinania w warunkach bez odpływu.
8
Content available Effect of Fe Content on the Mechanical Properties and Thermal Conductivity of the Al-RE Alloys
88%
Yoo H.-S. , Kim Y.-H. , Son H.-T.
|
2020
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tom Vol. 65, iss. 3
1029--1033
EN
In this study, we investigated the effect of Fe addition (0, 0.25, 0.50 and 0.75 wt.%) on the microstructure, mechanical properties and electrical conductivity of as-cast and as-extruded Al-RE alloys. As the Fe element increased by 0 and 0.75wt.%, the phase fraction increased to 5.05, 5.76, 7.14 and 7.38 %. The increased intermetallic compound increased the driving force for recrystallization and grain refinement. The electrical conductivity of Al-1.0 wt.%RE alloy with Fe addition decreased to 60.29, 60.15, 59.58 and 59.13 % IACS. With an increase in the Fe content from 0 to 0.75 wt.% the ultimate tensile strength (UTS) of the alloy increased from 74.3 to 77.5 MPa. As the mechanical properties increase compared to the reduction of the electrical conductivity due to Fe element addition, it is considered to be suitable for fields requiring high electrical conductivity and strength.
9
Content available Characterization of Ceramic Particle Reinforced Titanium Composite Produced Via Powder Metallurgy
88%
Angel D. A. , Miko T. , Benke M. , Gacsi Z.
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2020
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tom Vol. 65, iss. 2
515--519
EN
Nowadays, titanium is one of the most popular materials for aeronautical applications due to its good corrosion resistance, formability and strength. In this paper, rutile reinforced titanium matrix composites were produced via powder metallurgy. The steps included high energy ball milling of raw titanium and rutile powders in a planetary ball mill, which was followed by cold-pressing and sintering without external pressure. For the characterization of the milled powders and the sintered composites, scanning electron microscope, X-ray diffraction and compressive strength examinations were carried out. The results showed that the rutile has a strengthening effect on the titanium matrix. 1 wt% rutile increased the compressive strength compared to the raw titanium. Increasing the milling time of the metal matrix decreased the compressive strength values.
10
Teoreticheskoe obosnovanie rascheta zven'ev cepi konvejjera iz polimernykh kompozicionnykh materialov
88%
Tkachuk V. , Devin V.
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2016
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tom 18
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nr 5
11
Content available Properties of Pure Ti Implants Fabricated by Additive Manufacturing
88%
Kim D.-J. , Kim H.-G. , Kim J.-S. , Song K.-H.
Archives of Metallurgy and Materials
|
2019
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tom Vol. 64, iss. 3
959--962
EN
This study was carried out to evaluate the aspect of microstructure and mechanical property development on additive manufactured pure Ti at elevated heat-input. For this work, pure Ti powder (commercial purity, grade 1) was selected, and selective laser melting was conducted from 0.5 to 1.4 J/mm. As a result, increase in heat-input led to the significant grain growth form 4 μm to 12 μm, accompanying with the change of grain shape, correctly widmanstätten structured grains. In addition, Vickers microhardness was notably increased from 228 Hv to 358 Hv in accordance with elevated heat-input, which was attributed to the increased concentration of oxygen and nitrogen mainly occurred during selected laser melting process.
12
Content available Research on mechanical properties of birch plywood with special veneer lay-up schemes
88%
Lipinskis I. , Spulle U.
Drewno. Prace Naukowe. Doniesienia. Komunikaty
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2011
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tom 54
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nr 185
EN
Plywood is a wood-based panel material laminated of veneers where the grain direction is perpendicular in adjacent layers. The use of plywood can be extended if there is a possibility to use special lay-up schemes designed to improve mechanical properties which depend on the grain direction in the outer plies. This report contains results of research whose purpose was to determinate bending strength and modulus of elasticity of birch plywood types with special veneer lay-up schemes and of different width, bending flatwise and edgewise. Two special plywood types, 28 mm thick Spec1 and 30 mm thick Spec3, with different veneer lay-up schemes were selected for bending properties determination tests according to standard EN 789. Specimens were tested when the face veneer direction was parallel and then perpendicular to the specimens’ longer axis. Moisture content and density were determined as well. This report contains the comparison of bending strength properties of special plywood specimen with different width and load direction. It was found that bending strength was significantly higher for narrower special plywood specimens, and bending strength of special plywood loaded edgewise was 4 % lower for Spec1 and 9.5 % lower for Spec3 than for flatwise loaded specimen of the same cross-sectional dimensions.
PL
Zakres stosowania sklejki może być rozszerzony dzięki poprawie jej właściwości mechanicznych, uzyskanej m.in. przez wprowadzenie nietypowych rozwiązań układu fornirów. Celem badań było określenie właściwości mechanicznych wodoodpornej sklejki brzozowej, okleinowanej błoną fenolową, a różniącej się budową zestawu. Zakres pracy obejmował badania wytrzymałości na zginanie i modułu sprężystości zgodnie z normą EN 789. Pomiary prowadzono wzdłuż i w poprzek włókien dla różnego rozstawu podpór obciążających oraz prostopadle do płaszczyzny sklejki i jej krawędzi. Oznaczono również wilgotność i gęstość sklejki. Na podstawie przeprowadzonych badań stwierdzono, że wytrzymałość na zginanie jest znacznie wyższa dla mniejszego rozstawu podpór.
13
Content available Effects of grain properties on loads in model silo
88%
Molenda M. , Horabik J. , Thompson S. A. , Ross I. J.
International Agrophysics
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2004
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tom 18
|
nr 4
14
Content available The effect of sowing density on the lodging and mechanical properties of rape stalks
88%
Skubisz G.
International Agrophysics
|
1996
|
tom 10
|
nr 4
15
Preliminary investigations of the mechanical properties of meshes turned through 90 gradient
88%
Moderhak W.
Bulletin of the Sea Fisheries Institute
|
2000
|
nr 1
16
Content available Characteristics of physical properties of genetically modified potates. II. Mechanical properties of tubers
88%
Sadowska J. , Vacek J. , Palacios M. C. , Fornal J.
International Agrophysics
|
2004
|
tom 18
|
nr 4
17
Content available Influence of some mechanical properties of seed on energy requirement for their comminution
88%
Grochowicz J. , Nadulski R. , Bilanski W. K.
International Agrophysics
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1994
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tom 08
|
nr 2
18
Content available Geometry of cereal stalk cross-section
88%
Gowin J.
|
|
nr 1
19
Content available Mechanical properties of potato starch modified by moisture content and addition of lubricant
75%
Stasiak M. , Molenda M. , Horabik J. , Mueller P. , Opalinski I.
International Agrophysics
|
2014
|
tom 28
|
nr 4
EN
Laboratory testing was conducted to deliver a set of characteristics of structure and mechanical properties of pure starch and starch with an addition of a lubricant – magnesium stearate. Considerable influence of moisture content of potato starch was found in the case of density, parameters of internal friction, coefficients of wall friction and flowability. Elasticity was found to be strongly influenced by water content of the material. Addition of magnesium stearate affected density and parameters of flowability, internal friction and elasticity. Bulk density increased from 604 to 774 kg m-3 with decrease in moisture content of potato starch from 17 to for 6%. Addition of magnesium stearate resulted in approximately 10% decrease in bulk density. Angle of internal friction obtained for 10 kPa of consolidation stress decreased from 33 to 24º with increase in moisture content, and to approxi- mately 22º with addition of the lubricant. With an increase of moisture content from 6 to 18% and with addition of the lubricant, the modulus of elasticity during loading decreased from approximately 1.0 to 0.1 MPa. Modulus of elasticity during un- loading was found in the range from 19 to 42 MPa and increased with increase of moisture content and amount of lubricant.
20
Content available Colour, mechanical properties and water vapour permeability of pectin films
75%
Galus S. , Uchanski P. , Lenart A.
Acta Agrophysica
|
2013
|
tom 20
|
nr 3
EN
The aim of this work was to analyse the effect of pectin and glycerol concentration on colour, mechanical properties and water vapour permeability of pectin edible films. Pectin films were obtained from apple pectin film-forming solutions at concentrations of 1.5, 2.5 and 3.5%. Glycerol was added as a plasticizer at 30, 50 and 70% (w/w of pectin). Colour was measured in the L*a*b* system and total colour difference was calculated. Water vapour permeability at relative humidity differentials of 30-100% was measured at 25°C. Mechanical properties were presented as tensile force and elongation at break. Based on the results obtained, increasing content of pectin caused an increase in total colour difference, water vapour permeability and tensile force of ana-lysed films. Glycerol caused increasing elongation at break and water vapour permeability.
PL
Celem pracy było zbadanie wpływu ilości pektyny i glicerolu na barwę, wła-ściwości mechaniczne i przepuszczalność pary wodnej filmów pektynowych. Filmy pektynowe otrzymano z wodnych roztworów powłokotwórczych pektyny jabłkowej o stężeniu 1,5; 2,5 i 3,5%. Glicerol został dodany jako plastyfikator w ilości 30, 50 i 70%. Barwa została zmierzona w syste-mie L*a*b*, obliczono bezwzględną różnicę barwy. Właściwości mechaniczne wyrażono jako siłę zerwania oraz wydłużenie. Przepuszczalność pary wodnej zmierzono w temperaturze 25°C przy różnicy w wilgotnościach względnych środowiska 30-100%. Na podstawie otrzymanych wyników zaobserwowano wzrost bezwzględnej różnicy barwy, przepuszczalności pary wodnej i siły zerwania filmów zawierających wyższe ilości pektyny. Glicerol wpłynął na zwiększenie wydłużenia i prze-puszczalności pary wodnej analizowanych filmów.
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