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Wyświetlanie 1-15 z 19
Tytuł:
Comparison of the Models of the Air Gauge Static Characteristics
Autorzy:
Jermak, C. J.
Piątkowski, R.
Dereżyński, J.
Rucki, M.
Powiązania:
https://bibliotekanauki.pl/articles/140018.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
air gauge
dynamic measurement
in-process control
manometr do powietrza
pomiar dynamiczny
kontrola w trakcie procesu
Opis:
In the article, the authors analyze and discuss several models used to the calculation of air gauge characteristics. The model based on the actual mass flow (which is smaller than the theoretical one) was proposed, too. Calculations have been performed with a dedicated software with the second critical parameters included. The air gauge static characteristics calculated with 6 different models were compared with the experimental data. It appeared that the second critical parameters model (SCP) provided the characteristics close to the experimental ones, with an error of ca. 3% within the air gauge measuring range.
Źródło:
Archive of Mechanical Engineering; 2017, LXIV, 1; 93-110
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological Properties of AlSi17Cu5Mg Alloy Modified with CuP Master Alloy with Various Speeds of Friction
Autorzy:
Piątkowski, J.
Wieszała, R.
Powiązania:
https://bibliotekanauki.pl/articles/380741.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
friction coefficient
power of frictions
tribology
hypereutectic alloy Al-Si
współczynnik tarcia
siła tarcia
tribologia
stop Al-Si
Opis:
The paper presents the influence of modification with phosphorus (CuP10) on the tribological properties of the alloy AlSi17Cu5Mg coupled abrasively with cast-iron EN GJL-350. Tests of coefficient of friction and wear of mass were conducted on tribological tester T-01. An important aspect in the assessment of the tribological properties is the analysis of initial material microstructure in reference to silumin which underwent modification with phosphorus. It was found that the difference in structure of tested materials, mainly sizes of primary silicon crystals significantly influences the tribological properties whereas the speed change of the friction knot does not have such big influence.
Źródło:
Archives of Foundry Engineering; 2016, 16, 1; 45-48
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue Resistance of A390.0 Alloy Modified with Phosphorus
Autorzy:
Wieszała, R.
Piątkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/381178.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fatigue wear
unilateral pulsating vibration
hypereutectic Al-Si alloy
zużycie zmęczeniowe
drganie pulsacyjne
stop nadeutektyczny Al-Si
Opis:
The paper presents fatigue tests (unilateral pulsating vibrations) for hypereutectic silumin AlSi17Cu5Mg aimed at simulation of deflection of the piston head in a combustion engine. The methodology of the tests and the way of marking the deflection of the tested material is described together with the detailed description of the test stand. The fatigue resistance ZG was identified in the tested material and a Wöhler diagram was prepared to show the areas of limited and unlimited fatigue resistance.
Źródło:
Archives of Foundry Engineering; 2015, 15, 3 spec.; 99-102
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Modifications on Fatigue Strength of AlSi17Cu5Mg(Fe) Alloy Used for Pistons for Internal Combustion Engines
Autorzy:
Piątkowski, J.
Wieszała, R.
Powiązania:
https://bibliotekanauki.pl/articles/352387.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fatigue strength
Al-Si alloys
FEM analysis
Wöhler diagram
Opis:
Technological progress in construction of automotive vehicles, particularly in construction of engines, enforces simultaneous changes in foundry properties of aluminum alloys used in automotive industry. Until recently, abrasion resistance was the main usability criterion of a material used for pistons for internal combustion engines. At present however, because of the complexity of the process of the fuel mixture combustion, more restrictive standards of limited hydrocarbon emission, and the pursuit of reduction of the vehicle’s mass, fatigue strength of silumins enjoys a continuously increasing interest. The paper presents results of a computer simulation using the finite element method (FEM) and a real fatigue test of AlSi17Cu5Mg(0.5Fe) (A390.0) alloy with unilateral variable bending. The tests aimed to simulate a deflection of a combustion engine piston in a cylinder barrel were carried out in two variants: for a non-modified alloy and an alloy modified with CuP10 master alloy. Based on the distribution of stresses according to the Huber-Mises-Hencky theory (for a given range of the deflection from 0.1 to 0.3 mm), Wöhler curve was determined for the studied alloy. Based on on microstructural investigations, cracks of primary Si crystals were found, caused by fatigue changes resulting from unilateral pulsating vibrations.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 135-141
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resistance of WE43 and ZRE1 Magnesium Alloys to Gas Corrosion
Autorzy:
Przeliorz, R.
Piątkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/379573.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wear resistant alloys
magnesium alloys
oxidation resistance
stopy odporne na zużycie
stopy magnezu
odporność na utlenianie
Opis:
In spite of the fact that in most applications, magnesium alloys are intended for operation in environments with room temperature, these alloys are subject to elevated temperature and oxidizing atmosphere in various stages of preparation (casting, welding, thermal treatment). At present, the studies focus on development of alloys with magnesium matrix, intended for plastic forming. The paper presents results of studies on oxidation rate of WE43 and ZRE1 magnesium foundry alloys in dry and humidified atmosphere of N2+1%O2. Measurements of the oxidation rate were carried out using a Setaram thermobalance in the temperature range of 350-480°C. Corrosion products were analyzed by SEM-SEI, BSE and EDS. It was found that the oxide layer on the WE43 alloy has a very good resistance to oxidation. The high protective properties of the layer should be attributed to the presence of yttrium in this alloy. On the other hand, a porous, two-layer scale with a low adhesion to the substrate forms on the ZRE1 alloy. The increase in the sample mass in dry gas is lower than that in humidified gas.
Źródło:
Archives of Foundry Engineering; 2017, 17, 2; 217-221
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected Tribological Properties of A390.0 Alloy
Autorzy:
Wieszała, R.
Piątkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/380094.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tribological properties
friction coefficient
A390.0 alloy
właściwości tribologiczne
współczynnik tarcia
stop A390.0
Opis:
Emergence of new designs for internal combustion engines resulted in a necessity to search for new materials which will rise to excessive technological requirements under operating conditions of modern internal combustion engines of up to 150 kW. Focusing only on material properties, theoretically existing alloys should meet presents requirements. More importantly, existing materials are well fitted to the entire crank-piston system. Thus, there is a need for a more thorough examination of these materials. The paper presents studies on determination of coefficient of friction μ and wear for the A390.0 alloy modified with AlTi5B master alloy combined with EN GJL-350 cast iron. The characteristics of a T-11 tribological tester (pin on disc) used for the tests, as well as the methodology of the tribological tests, were described. Also, the analysis of the surface distribution of elements for the pin and the disc was presented. The studies were realized in order to find whether the analyzed alloy meets the excessive requirements for the materials intended for pistons of modern internal combustion engines. The results show that the A390.0 alloy can only be applied to a load of 1.4 MPa. Above this value was observed destructive wear, which results in the inability to use it in modern internal combustion engines.
Źródło:
Archives of Foundry Engineering; 2017, 17, 4; 175-178
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of DSC Method in Studies on Phase Transitions of Ni Superalloys
Autorzy:
Przeliorz, R.
Piątkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/382295.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative material
innovative technology
nickel superalloy
differential scanning calorimetry
specific heat
innowacyjny materiał
technologia innowacyjna
nadstop niklu
skaningowa kalorymetria różnicowa
ciepło właściwe
Opis:
The paper presents results of calorimetric studies of foundry nickel superalloys: IN100, IN713C, Mar-M247 and ŻS6U. Particular attention was paid to determination of phase transitions temperatures during heating and cooling. The samples were heated to a temperature of 1500°C with a rate of 10°C min–1 and then held at this temperature for 5 min. After a complete melting, the samples were cooled with the same rate. Argon with a purity of 99.99% constituted the protective atmosphere. The sample was placed in an alundum crucible with a capacity of 0.45 cm3. Temperature and heat calibration was carried out based on the melting point of high-purity Ni. The tests were carried out by the differential scanning calorimetry (DSC) using a Multi HTC high-temperature calorimeter from Setaram. Based on the DSC curves, the following temperatures were determined: solidus and liquidus, dissolution and precipitation of the γ’ phase, MC carbides and melting of the γ’/γ eutectic. In the temperature range of 100-1100°C, specific heat capacity of the investigated superalloys was determined. It was found that the IN713C and IN100 alloys exhibit a higher specific heat while compared to the Mar-M247 and ŻS6U alloys.
Źródło:
Archives of Foundry Engineering; 2017, 17, 4; 133-136
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of starting process on wear of cylinder wall
Autorzy:
Lewkowicz, R.
Piątkowski, P.
Ściegienka, R.
Szymaniuk, B.
Powiązania:
https://bibliotekanauki.pl/articles/133079.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
cylinder wall
oil grade
wear
ścianki cylindra
zużycie
Opis:
The results of experimental research of cylinder wall wearing process were presented in this article. Researches were conducted on the basis of four strokes spark ignition one cylinder engine. The main goal of presented research was assessment of impact of cold start condition on intensity of cylinder wall wearing process. The new one and worn engine oil with grade 10W40 was used for experimental research. The experimental research was conducted on specially developed experimental stand. The wear of cylinder wall was assessed on the basis of cylinder diameter and wall roughness measurements.
Źródło:
Combustion Engines; 2017, 56, 2; 176-180
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Casting Conditions on Tribological Properties of A390.0 Alloy
Autorzy:
Piątkowski, J.
Wieszała, R.
Gontarczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/379531.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alloy Al-Si
silumin
grey cast iron
tribological properties
friction coefficient
casting conditions
heat removal
stop Al-Si
żeliwo szare
właściwości tribologiczne
współczynnik tarcia
warunki odlewania
odprowadzanie ciepła
Opis:
The paper presents tribological properties of A390.0 (AlSi17Cu5Mg) alloy coupled in abrasive action with EN-GJL-350 grey cast-iron. The silumin was prepared with the use of two different technologies which differed in terms of cooling speed. In the first case the alloy was modified with foundry alloy CuP10 and cast to a standard tester ATD and in case of second option the modified alloy was cast into steel casting die. Due to different speed of heat removal the silumins varied in structure, particularly with size of primary crystals of silicon and their distribution in matrix which had a significant influence of friction coefficient in conditions of dry friction.
Źródło:
Archives of Foundry Engineering; 2016, 16, 3; 95-98
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Application of ATD and DSC Methods to Study of the EN AC-48000 Alloy Phase Transformations
Autorzy:
Piątkowski, J.
Przeliorz, R.
Szymszal, J.
Powiązania:
https://bibliotekanauki.pl/articles/380416.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alloy Al-Si
thermal analysis
differential scanning calorimetry
phase transformations
enthalpy
stop Al-Si
analiza termiczna
różnicowa kalorymetria skaningowa
przemiany fazowe
entalpia
Opis:
Tests concerning EN AC 48000 (AlSi12CuNiMg) alloy phase transition covered (ATD) thermal analysis and (DSC) differential scanning calorimetry specifying characteristic temperatures and enthalpy of transformations. ATD thermal analysis shows that during cooling there exist: pre-eutectic crystallization effect of Al9Fe2Si phase, double eutectic and crystallization α(Al)+β(Si) and multi-component eutectic crystallization. During heating, DSC curve showed endothermic effect connected with melting of the eutectic α(Al)+β(Si) and phases: Al2Cu, Al3Ni, Mg2Si and Al9Fe2Si being its components. The enthalpy of this transformation constitutes approx. +392 J g-1. During freezing of the alloy, DSC curve showed two exothermal reactions. One is most likely connected with crystallization of Al9Fe2Si phase and the second one comes from freezing of the eutectic α(Al)+β(Si). The enthalpy of this transformation constitutes approx. –340 J g-1. Calorimetric test was accompanied by structural test (SEM) conducted with the use of optical microscope Reichert and scanning microscope Hitachi S-4200. There occurred solution's dendrites α(Al), eutectic silicon crystal (β) and two types of eutectic solution: double eutectic α(Al)+β(Si) and multi-component eutectic α+AlSiCuNiMg+β.
Źródło:
Archives of Foundry Engineering; 2017, 17, 2; 207-211
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of digester biogas tank. Part I.: Biogas calculator - Tool to perform biogas energy calculations
Projektowanie zbiornika komory biogazowej. Część I. : Kalkulator biogazu narzędzie umożliwiające przeprowadzenie obliczeń energetycznych biogazowni
Autorzy:
Tucki, K.
Mruk, R.
Piatkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/792839.pdf
Data publikacji:
2015
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2015, 15, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Study of Phase Transformations of AlSi9Cu3 Alloy by DSC Method
Autorzy:
Piątkowski, J.
Przeliorz, R.
Gontarczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/380349.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Si cast alloy
differential scanning calorimetry
thermal analysis
phase transformation
enthalpy
stop odlewniczy Al-Si
skaningowa kalorymetria różnicowa
analiza termiczna
przemiana fazowa
entalpia
Opis:
With the use of differential scanning calorimetry (DSC), the characteristic temperatures and enthalpy of phase transformations were defined for commercial AlSi9Cu3 cast alloy (EN AC-46000) that is being used for example for pressurized castings for automotive industry. During the heating with the speed of 10ºC∙min-1 two endothermic effects has been observed. The first appears at the temperature between 495 ºC and 534 ºC, and the other between 555 ºC and 631 ºC. With these reactions the phase transformation enthalpy comes up as +6 J g-1 and +327 J g-1. During the cooling with the same speed, three endothermic reactions were observed at the temperatures between 584 ºC and 471 ºC. The total enthalpy of the transitions is – 348 J g-1. Complimentary to the calorimetric research, the structural tests (SEM and EDX) were conducted on light microscope Reichert and on scanning microscope Hitachi S-4200. As it comes out of that, there are dendrites in the structure of α(Al) solution, as well as the eutectic (β) silicon crystals, and two types of eutectic mixture: double eutectic α(Al)+β(Si) and compound eutectic α+Al2Cu+β.
Źródło:
Archives of Foundry Engineering; 2016, 16, 4; 109-112
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of FEM Analysis for Evaluation of the Stress and Deformation Distributions in the Top Layer of A390.0 Alloy During Friction
Autorzy:
Wieszała, R.
Piątkowski, J.
Bąkowski, H.
Powiązania:
https://bibliotekanauki.pl/articles/381624.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hypereutectic Al-Si alloy
surface layer
finite elements method
FEM
stop Al-Si
warstwa powierzchniowa
metoda elementów skończonych
MES
Opis:
The paper presents an analysis of the effect of shape of primary silicon crystals on the sizes of stresses and deformations in a surface layer of A390.0 alloy by Finite Elements Method (FEM). Analysis of stereological characteristics of the studied alloy, performed based on a quantitative metallographic analysis in combination with a statistical analysis, was used for this purpose. The presented simulation tests showed not only the deposition depth of maximum stresses and strains, but also allowed for determining the aforementioned values depending on the shape of the silicon crystals. The studied material is intended for pistons of internal combustion engines, therefore the analysis of the surface layer corresponded to conditions during friction in a piston-cylinder system of an internal combustion engine having power of up to 100 kW. The obtained results showed important differences in the values of stresses and strains up to 15% between various shape of the silicon crystals. Crystals with sharp edges caused higher stresses and deformation locally than those with rounded shapes.
Źródło:
Archives of Foundry Engineering; 2017, 17, 1; 228-234
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of inlet channel geometry on in-cylinder swirl
Autorzy:
Piątkowski, P.
Lewkowicz, R.
Ściegienka, R.
Mysłowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/133260.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
intake system
swirl
ANSYS
CFD
computed flow dynamics
układ dolotowy
Opis:
A few chosen methods of swirl generation inside the cylinder were presented in this article. There were presented the results of impact of intake channel geometry on chosen charge movement parameters related to the air-flow inside the cylinder. Moreover, there was presented an authors own conception of flexible and steerable element applied inside the inlet channel. This element influenced on kinematics of airflow through the inlet manifold. The result of this influence was observed as a swirl inside the inlet channel and inside the cylinder. There were also presented the results of experiment related to the own conception of swirl generation. The results of experimental research were compared with results of numerical calculation of air flow prepared on basis of ANSYS CFD. As final result it was stated that proponed flexible element inside the inlet channel have a significant impact on charge kinematics and it easy can controlled by engine control unit.
Źródło:
Combustion Engines; 2017, 56, 4; 201-206
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of digester biogas tank. Part 4: The stress analysis of digester biogas tank
Projektowanie zbiornika komory biogazowej. Cz.4.: Analiza stanu naprężeń pierścienia zbiornika biogazu
Autorzy:
Tucki, K.
Klimkiewicz, M.
Mruk, R.
Piatkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/793195.pdf
Data publikacji:
2015
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2015, 15, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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