Wyniki wyszukiwania - Biblioteka Nauki

1

Stabilization of the titanium vibration damping wires in the steam turbine blades system

100%

Serbiński W.

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2008

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tom Vol. 8, nr 1(15)

142-146

EN

Damping wires are usually used for damping of vibration blades in the steam turbines. Chromium steels or titanium alloys are still applied materials for producing the vibration damping wires. In this paper the stabilization method of the titanium vibration damping wires in the steam turbine blades system is performed. Microstructure and mechanical properties of the damping wires made of WT3-1 titanium alloy after cold and hot bending processes were presented. Analysis of the investigation results cold and hot bended vibration damping wires suggest, that stabilizing by hot bending of the titanium wires in the steam turbine blades system can be used in practice with successful.

2

Ocena właściwości mechanicznych glin ablacyjnych zlodowacenia bałtyckiego określona na podstawie testu statycznego sondowania CPTU i w aparacie bezpośredniego ścinania

100%

Borowczak P.

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2011

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tom Nr 9

165-177

PL

Metody określania parametrów wytrzymałościowych gruntów słabonośnych na podstawie badań laboratoryjnych są obecnie wypierane przez badania „in situ" prowadzonych głównie za pomocą sondowań statycznych. Zaletą sondowań jest ciągły pomiar rejestracji oporu stożka i tulei ciernej pozwalający z dużą dokładnością ustalić słabe miejsca w podłożu gruntowym, dla których na podstawie interpretacji wykresów można określić parametry tego podłoża. Ocena właściwości gruntów na podstawie próbek z wierceń badawczych dostarczanych do laboratorium, sprowadza się praktycznie do badań podstawowych, i wybiórczo ze względu na czas do określenia cech mechanicznych. W artykule porównano rezultaty badań otrzymanych z sondowań statycznych z wynikami osiągniętymi drogą tradycyjną w badaniach wytrzymałościowych realizowanych w aparacie bezpośredniego ścinania typu ABS.

EN

Determination of mechanical parameters by laboratory methods are more often replaced by advanced "in situ" methods, mainly by the static CPTU soundings. The advantage of the static soundings are continuous measurement of soil parameters, by registering friction on the cone. Such soundings allows very detailed measurements of every change is soil conditions. Proper interpretation of CPTU soundings gives soil parameters, including mechanical properties. Determination of soil parameters by laboratory testing, executed on samples taken by drilling methods, mainly deals with basic soil parameters, and only few samples are tested for determination of mechanical parameters. This is mainly due to limited time allowed for the investigations. This paper gives the comparison of results obtained from CPTU soundings and laboratory testing, mainly direct shear - ABS type tests.

3

Mechanical properties of magnesium alloy AZ61 prepared ecap technology

100%

Greger M. , Čížek L. , Prażmowski M.

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2007

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tom Vol. 321, z. 89

123-124

4

Mechanical properties of Co-based amorphous ribbons

100%

Konieczny J. , Dobrzański L. , Pešek L. , Zubko P.

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2008

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tom Vol. 31, nr 2

254-261

EN

Purpose: The goal of this work was to investigate the influence of chemical composition and isothermal heating in order to determine the change of the mechanical properties of the metallic ribbons by depth sensing indentation technique. Design/methodology/approach: The amorphous metallic ribbons were manufactured by planar-flow-casting method. Instrumented hardness measuring was carried out using the nanohardness tester DUH-202 with a Vickers indenter. Observations of the structure of powders were made on the OPTON DSM-940 scanning electron microscope. The diffraction examinations and examinations of thin foils were made on the JEOL JEM 3010 transmission electron microscope. Findings: The analysis of the mechanical properties and structure of the Co-based amorphous ribbons obtained in the by planar-flow-casting process proved that the no significant differences between both ternary alloys in local mechanical properties HM, EIT and W were observed for amorphous state but differences between ternary and multicomponent alloys were observed. In heat treated state small differences between materials were observed too. Research limitations/implications: For the metallic Co-based amorphous ribbons, further mechanical examinations and structure are planed. Practical implications: Feature an alternative to commercial alloys and composite materials are the amorphous and nanocrystalline metal amorphous ribbons obtained by melt spinning technique and make it possible to obtain the new composite materials with best mechanical properties, whose dimensions and shape can be freely formed. Originality/value: The paper presents influence of annealing temperature and chemical composition of metallic ribbons on martens hardness, indentation modulus EIT, work for deformation and ratio of elastic and total indentation energy. Heating of ribbons obtained by melt spinning technique, to check its effect on changes of mechanical properties. Results and a discussion of the influence of annealing temperature microhardness metallic ribbons is presented.

5

Fatigue failure of micro-alloyed 23MnB4 steel

100%

Rusz S. , Cizek L. , Filipec P. , Pastrnak M.

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2008

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tom Vol. 31, nr 2

356-363

EN

Purpose: In the following paper there have been the structure and fatigue properties of micro-alloyed 23MnB4 steel in initial state and after heat treatment evaluated. Design/methodology/approach: Fatigue test of micro-alloyed 23MnB4 steel was completed by metallographic and fracture analyses. For scope the methods of the light microscopy and SEM were used. Findings: Microstructure of examined alloy in initial state was characterized mostly by fine ferrite with pearlitic net and in state after heat treatment was formed by martensite or partly by bainite and after tempering was formed by tempered martensite. Objective of this work consisted in determination of fatigue characteristics of micro-alloyed 23MnB4 steel, including fracture analyze. Results of fatigue testing at various stress levels for the samples in initial state and after the heat treatment have confirmed that obtained values of cycles to rupture were at least 585 000 cycles. Change of fatigue properties in dependence on heat treatment of the used steel. Research limitations/implications: For define fracture area a samples must be provide with notch. The experiment was limited by occurrence a void in cast alloys. Practical implications: The results may be utilized for application of the investigated material in process of manufacturing. Originality/value: These results contribute to explanation of fracture mechanism of micro-alloyed 23MnB4 steel.

6

Strukturalne aspekty właściwości mechanicznych stopów na osnowie fazy Ni3Al.

100%

Wierzbiński S. , Kurtyka P. , Hyjek P.

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2003

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tom R. 48, nr 3

121-124

PL

Określono wpływ takich dodatków stopowych, jak: chrom, żelazo, tytan, tantal, molibden i cyrkon na plastyczne formowanie kierunkowo krystalizowanych stopów na osnowie fazy Ni3Al w ograniczonym zakresie temperatur i prędkości odkształcania, jak również na kierunkowość właściwości mechanicznych. Sekwencje zmian struktury płytkowej (NiAlCrFe) oraz dendrytycznej (NiAlCrTi) w badanych stopach skorelowano z charakterystykami mechanicznymi odkształcania (sigma-epsilon) uzyskanymi w testach ściskania. Wysoka wytrzymałość stopów w zakresie temperatur 800-900 K (NiAlCrFe) i 1100-1200 K (NiAlCrTi) przesądza o przydatności tych stopów na elementy maszyn pracujące w podwyższonych temperaturach.

EN

An effect of such alloy additions as chromium, iron, tantalum, molybdenum and zirconium on plastic forming of the Ni3Al-phase based alloys solidified directionally within limited ranges of temperatures and deformation rates, and on directionality of their mechanical properties, has been determined. The sequence of changes of the lamellar structure (NiAlCrFe) and dendritic structure (NiAlCrTi) in the alloys examined was correlated with mechanical deformation characteristics (sigma-epsilon) obtained from compression tests. High strength of the alloys within the temperature range of 800-900 K (NiAlCrFe) and 1100-1200 K (NiAlCrTi) proved that they can be used for machine elements operating at elevated temperatures.

7

General principles of bone tissue testing

100%

Knets I.

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1999

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tom Vol. 1, nr 2

55-66

EN

Five basic principles that govern the structure and biomechanical behaviour of biological tissue have been analysed. Many different factors of the mechanical and biological origin, which can significantly affect the mechanical properties and, consequently, the mechanical behaviour of the bone tissue are presented and discussed. The effect of structural levels in the bone tissue on the selection of proper size of the test specimens is emphasised. Different aspects of the testing procedure of bone tissue are discussed. Peculiarities of the distribution of its biomechanical properties in the man left tibia are described.

8

Właściwości mechaniczne tulei papierowych Część 1. Metody badania

100%

Szewczyk W.

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2011

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tom R. 67, nr 2

91-94

PL

Niniejszy artykuł stanowi wprowadzenie do cyklu publikacji dotyczących badania i przewidywania właściwości mechanicznych tulei papierowych w oparciu o informacje dostępne w literaturze, a także o wyniki badań własnych, przedstawiono różne metody pomiarów właściwości tulei. Między innymi omówiono metody badań, w których stosowane są obciążenia momentami gnącymi i siłami ściskającymi. Omówiono także powody, które utrudniają teoretyczne określenie wytrzymałości tulei w różnych stanach obciążeń, wskazując jednocześnie możliwości uproszczenia teoretycznego opisu właściwości mechanicznych tulei, w przypadkach gdy możliwe jest traktowanie materiału włóknistego jak ciała sprężystego.

EN

This article provides an introduclion to a series of publications concerning research and prediction of mechanical properties of paper cores. On the basis of available literature and results ot author's tests, the measurement methods of paper cores properties were presented. Among other things the author described, in which loads are applied bending moments and compressive lorces. Also discussed the reasons why it is difficult to identily the theoretical strength of the sleeve in various states of load, indicaling the possibility of simplifying the theoretical descriplion ot the mechanical properties of the sleeve, where it is possible to treat the fibrous material as the elastic body.

9

Effect of compression pressure on mechanical and release properties of tramadol matrix tablets

100%

Adeleye O. A. , Femi-Oyewo M. N. , Odeniyi M. A.

Current Issues in Pharmacy and Medical Sciences

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2015

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tom 28

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nr 2

120-125

EN

Drug delivery to the proper site of action in the body is greatly influenced by the excipients used and some processing variables such as changes in compression force. The aim of this investigation was to study the influence of changes in compression forces during tablet manufacturing on the mechanical and release properties of Tramadol matrix tablet. Hardness and friability were used as assessment parameters for mechanical properties while release properties were analysed using dissolution test. Data were analysed using One-way ANOVA at p < 0.05. Tablet hardness and friability were typically compression pressure-dependent with a significant difference in tablet hardness and friability with increase in compression pressure (p < 0.001). Drug release was best expressed by Korsmeyer-Peppas equation as the plots showed high linearity (r2) of 0.998 and 0.988 for formulations containing Xanthan gum and Sodium carboxymethylcellulose, respectively. Drug release from formulations containing Xanthan gum was mainly by diffusion while a combination of diffusion and chain relaxation was the mechanism of drug release from formulation containing Sodium Carboxymethylcellulose. The release properties of tramadol matrix tablet were not significantly influenced by compression pressure but rather by the polymer and the material properties of the drug.

10

Characteristics of Ti(C,N) and (Ti,Zr)N gradient PVD coatings deposited onto sintered tool materials

100%

Dobrzański L. A. , Staszuk M. , Pawlyta M. , Kwaśny W. , Pancielejko M.

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2008

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tom Vol. 31, nr 2

629-634

EN

Purpose: The purpose of this paper is the characterisation of Ti(C,N) and (Ti,Zr)N thin films produced by cathode arc evaporation physical vapour deposition (CAE-PVD) method onto sintered carbides and sialon tool ceramics. Design/methodology/approach: The GDOS spectrometer was used to indicated chemical concentration changes of the coating components. The phase composition of the investigated coatings was determined by means of the X-ray diffractometer: standard and grazing incidence X-ray diffraction methods. Observations of surface topography and fractures of the deposited coatings were carried out in the scanning electron microscope. Tests of the coatings adhesion to the substrate material were made by use of the scratch test. The microhardness of substrates and coatings were measured by Vickers method. Cutting ability was determined by technological cutting trials. Findings: The studied PVD gradient coatings deposited by cathodic arc evaporation method are demonstrated high hardness, adhesion and wear resistance. The critical load LC2, which is in the range 21-53 N, depends on both the coating type and material substrate. Coatings deposited on sintered carbides are extending tools life. Practical implications: Ti(C,N) and (Ti,Zr)N gradient coatings can be applied for cutting tools. Originality/value: It should be emphasized, that the mechanical properties of the PVD coatings described in this work are very encouraging and therefore their application for products manufacturing at mass scale is possible in all cases where reliable, very hard and abrasion resistant coatings, deposited onto sintered tools substrate are required.

11

Opracowanie metodyki określania właściwości mechanicznych na podstawie próby ścinania

100%

Cesarz S.

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2008

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tom T. 60, nr 3

49-50

PL

Celem pracy było opracowanie i wdrożenie nowej metody badań właściwości mechanicznych. W pracy zaprojektowano i wykonano urządzenie do próby ścinania, przeprowadzono badania wytrzymałości na ścinanie, wykonano próby rozciągania i ustalono zależności między wynikami uzyskanymi z obu tych prób.

EN

The purpose of this work was to develop and implement a new method for testing mechanical properties. In the work, the shearing test device was designed and made, shear strength tests and tensile tests were carried, and relationships between the results obtained in both types of the tests were determined.

12

The modification process of AlSi21CuNi silumin and its effect on change of mechanical properties of the alloy

100%

Pezda J.

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2011

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tom Vol. 11, iss. 2

101-104

EN

Due to difficulties present during machining operations and with segregation of crystals of primary silicon, hypereutectic silumins can be used after modification only. It is why elaboration of effective modification methods is necessary for complete utilization of such alloys for machinery parts made from castings. In the paper are presented test results concerning an effect of modification with phosphor copper and strontium of AlSi21CuNi silumin on change of its mechanical properties [...] and its structure. Investigated alloy was melted in electric resistance furnace. All smelting processes were performed in temperature of 800 - 820oC. Obtained results concern light microscopy and strength tests of the investigated alloy. Performed tests have shown that application of phosphorus in form of CuP10 and AlSr10 master alloy as an inoculant gives positive results in form of refinement of primary crystals of silicon. Modification with phosphorus has enabled obtainment of clearly visible growth of tensile strength, [...].

13

Influence of Cu Addition and Austempering Treatment on Mechanical Properties and Microstructure of GGG 50

100%

Kilinc B. , Kirtay S.

Acta Physica Polonica A

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2017

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tom 132

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nr 3

461-465

EN

An investigation was carried out to examine the effect of austempering on the microstructure and mechanical properties of nodular cast iron GGG 50 (DIN EN 1563) alloyed with different amount of copper. Optical, scanning electron microscopy and energy dispersive spectroscopy analyses were performed for microstructural characterization. In addition, hardness and tensile tests were carried out for mechanical properties determination. Specimens were austenitized at 900°C for an hour, then austempered for an hour at 330°C in salt bath and cooled at a room temperature in air. The results indicated that the addition of Cu to GGG 50 encouraged pearlite formation in the matrix structure. In addition, with the austempering heat treatment, the structure was transformed from ferrite + pearlite into ausferrite and retain austenite. Furthermore, for the alloy with 2 wt% Cu addition, it was noted that the graphite nodules diverged from sphericity and Cu was concentrated around the graphite. After austempering, mechanical properties were significantly improved and the highest mechanical properties were found at 1.5 wt% Cu.

14

Mechanical Properties of Soda-Lime-Silica Glasses Doped with Eggshell Powder

100%

Aktas B. , Albaskara M. , Dogru K. , Yalcin S.

Acta Physica Polonica A

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2017

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tom 132

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nr 3

436-438

EN

In this study, eggshell powder obtained from eggshell waste was used as a dopant in soda-lime-silica glass powders. Various eggshell-doped soda-lime-silica glass samples were produced through melting, and the effect of the eggshell powders on the mechanical properties of the soda-lime-silica glasses was investigated by micro-Vickers indentation tests. The X-ray diffraction results of the eggshell-doped glasses showed that, depending on the dopant content, different phases such as gypsum, nepheline, alunogene, aragonite, cristobalite etc. appeared. These results were different from the X-ray diffraction patterns of pure soda-lime-silica glass powders, where the phases observed included sodium aluminium silicate, sodium aluminum oxide, and silicon oxide. Although the elastic modulus of soda-lime-silica glasses increased with the addition of the eggshell powders, the dopant powders also caused an increase in the hardness of the glasses. Furthermore, it was found that the fracture toughness increased for soda-lime-silica glasses with 0.5 and 1 wt% eggshell powder, while it decreased for samples with eggshell powder contents ≥1 wt%. This behaviour could be explained by an increased depolymerization in the network connectivity of the glass when the amount of eggshell dopant increases.

15

Numerical model of a TIG welding process for the aviation industry, including analysis of the heat transfer

100%

Kuźniar A. , Rygiel P. , Dudek S. , Gnot A. , Gancarczyk T. , Perzyński K.

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2011

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tom Vol. 11, No. 1

173-178

EN

TIG welding is an important process, which is commonly used in the aircraft industry. A number of elements of air-plane bodies or shields of engines arę made using this technique. Numerical models of this process are needed to under-stand better phenomena involved in the TIG welding and to design the optimal process parameters. In the present paper numerical simulations were performed and the possibilities of modeling heat transfer in the investigated process were evaluated. Comparison of results of numerical simulations with the experimental data confirmed good predictive capabilities of the model, as far as realistic description of the phenomena involved in this process are considered. Correctness of the Goldak model, which describes density of the energy in the heat source, was confirmed as well.

PL

Spawanie TIG jest jednym z najważniejszych procesów używanych w przemyśle lotniczym. Wiele elementów zarówno dla kadłubów, awioniki jak i silników powstaje dzięki temu procesowi. Inżynierowie potrzebują coraz to nowocześniejszych modeli, które pozwolą na łatwe zrozumienie zjawisk zachodzących podczas procesu spawania. W artykule autorzy dokonali szeregu symulacji numerycznych mających na celu ocenienie możliwości modelowania rozkładu ciepła w procesie spawania metodą TIG. Wyniki symulacji porównano z pomiarami przeprowadzonymi na laboratoryjnym stanowisku spawalniczym. Porównanie wyników symulacji numerycznych i pomiarów wykazało dobrą zgodność potwierdzając możliwości modelu w zakresie realistycznego opisu procesu spawania metodą TIG. Potwierdzona została również prawidłowość działania modelu Goldaka opisującego rozkład energii źródła ciepła w procesie spawania.

16

Microstructural Aspects of Fatigue Parameters of Lead-Free Sn-Zn Solders with Various Zn Content

100%

Maj M. , Wojciechowski A. , Pietrzak K. , Klasik A. , Sobczak N.

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nr 1

17

Thermal Modeling of Friction Stir Welding of Sc-Modified Al-Zn-Mg-Cu Alloy

100%

Hamilton C. , Dymek S. , Senkov O.

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2009

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tom Vol. 9, No. 4

416-423

EN

Small additions of scandium to Al-n-Mg-Cu 7000 series alloys can significantly improve mechanical properties and augment the strength retention at low and elevated temperatures. This research program evaluates the residual properties of Sc-modified Al-Zn-Mg-Cu alloy extrusions joined through friction stir welding (FSW). Mechanical testing was performed on the baseline material and on panels friction stir welded at 175, 225, 250, 300, 350 and 400 RPM (all other weld parameters were held constant). A thermal model of friction stir welding was developed utilizing an energy-based scaling factor to account for tool slip. The proposed slip factor is derived from an empirical relationship between the ratio of the maximum welding temperature to the solidus temperature and energy per unit length of weld. The thermal model successfully predicts the maximum welding temperatures over a range of energy levels, and the mechanical behavior is correlated to the temperature distribution predicted by the model.

PL

Niewielki dodatek skandu do stopu Al-Zn-Mg-Cu z serii 7000 może w znaczący sposób poprawić właściwości mecha-niczne w temperaturze pokojowej oraz powstrzymać spadek wytrzymałości w temperaturze podwyższonej. W zaprezento-wanych badaniach dokonano oceny właściwości mechanicznych połączeń stopu Al-Zn-Mg-Cu modyfikowanego skandem wyko-nanych metodą zgrzewania tarciowego z mieszaniem materiału zgrzeiny (FSW). Badania mechaniczne wykonano na materiale rodzimym oraz na próbkach zgrzewanych z prędkościami obro-towymi narzędzia 175, 225, 250, 300, 350 i 400 obrotów na minutę (przy jednakowych pozostałych parametrach procesu). Opracowano komputerowy model cieplny zgrzewania tarciowego z mieszaniem materiału zgrzeiny wykorzystujący energetyczny współczynnik ujmujący poślizg narzędzia w trakcie procesu. Współczynnik ten zaproponowano w oparciu o doświadczalną zależność pomiędzy stosunkiem maksymalnej temperatury podczas zgrzewania do temperatury solidus oraz energii wydatkowanej na jednostkę długości zgrzeiny. Opracowany model bardzo dobrze przewiduje maksymalne temperatury zgrzewania dla szerokiego zakresu energii oraz wykazuje dobrą korelację właściwości mechanicznych z temperaturą przewidzianą przez model.

18

Pełny zapis falowy jako źródło danych o mechanicznych własnościach formacji skalnej

100%

Stadtmuller M. , Kołodziejczyk I. , Nowak J.

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2006

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tom nr 137

531-531

PL

Znajomość mechanicznych własności przewiercanej formacji skalnej (stała Poissona, ściśliwość, moduły sprężystości: objętościowej, poprzecznej, Younga,) umożliwia prawidłowy dobór parametrów wiercenia i ma istotne znaczenie przy projektowaniu zabiegów intensyfikacyjnych, wykonywanych w horyzontach perspektywnych. Referat przedstawia aktualne możliwości określania parametrów sprężystych na podstawie pomiarów sondami LSS (Long Spaced Sonic) i FWS (Full Wave Sonic), oprogramowania Fala pakietu GEOWIN i Full Wave firmy Halliburton Energy Services, oraz przykłady wyliczenia tych parametrów dla wybranych rejonów zapadliska przedkarpackiego.

EN

The knowledge on the drilled formation mechanical features (Poisson ratio, share, Young and bulk moduli) allows appropriate selection of boring parameters and is of significant importance in designing of intensifying activities in perspective horizons. The paper presents the most recent opportunities to define elastic parameters on the basis of the measurements by means of LSS (Long Space Sonic) and FWS (Full Wave Sonic) tools Fala part of GEOWIN and FullWave, Halliburton Energy Services software, as well as examples of calculation of the parameters for the Carpathian Foredeep selected regions.

19

Sintered Steels Coated with a Chromium Layer Doped with Diamond Nanoparticles

100%

Petkov V. , Valov R. , Witkowska M. , Madej M. , Cempura G. , Sułowski M. , Petkov V. , Valov R. , Witkowska M. , Madej M. , Cempura G. , Sułowski M.

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nr 4

20

Mechanical properties evaluation and ultrasound diagnosis of unsaturated polyester-glass pipes

100%

Wróbel G. , Rojek M. , Szymiczek M.

Polish Journal of Chemical Technology

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2015

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tom 17

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nr 2

77-83

EN

The purpose of the present work was the elaboration of research methodology of the exhaustion degree of performance properties of pipes based on unsaturated polyester and glass fibers, which were manufactured by the cross winding method on a poly(vinyl chloride) core. Within the frame of the work we conducted fatigue-ageing tests being the simulation tool of the degradation process of polyester-glass pipes. Diagnosis of the composite material condition was conducted with the use of nondestructive ultrasonic testing with the application of the echo method, in which the transition time of ultrasonic wave was determined as the identifying parameter. The registered transition time of ultrasonic wave allowed the identification of the material condition during the course of pipes exploitation.