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Tytuł:
Antyplastyfikujący wpływ wody na produkty zbożowe
Antiplasticizing effect of water in cereal products
Autorzy:
Marzec, A.
Lewicki, P. P.
Powiązania:
https://bibliotekanauki.pl/articles/289863.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
aktywność wody
pieczywo chrupkie
płatki zbożowe
właściwości mechaniczne
water activity
crispbread
mechanical properties
Opis:
Celem pracy było badanie wpływu aktywności wody na właściwości mechaniczne pieczywa chrupkiego kukurydziano-gryczanego i płatków kukurydzianych. Zakres pracy obejmował analizę krzywych łamania, pracy i naprężeń. Zmiana aktywności wody wpływa na właściwości mechaniczne pieczywa chrupkiego i płatków kukurydzianych. Stwierdzono, że aktywność wody istotnie wpływała na mechanizm niszczenia produktów zbożowych. Przy niskiej aktywności wody wystąpiło pękanie kruche materiału, a jej wzrost powodował zwiększenie rozciągliwości produktu i jego płynięcie. Wzrost aktywności wody do około 0,52 w pieczywie i do aw=0,64 w płatkach kukurydzianych powodował utwardzenie materiału. Woda była czynnikiem antyplastyfikującym. Wyższa aktywność wody w materiale wywołała jego mięknięcie. Woda stała się plastyfikatorem.
Mechanical properties of extruded flat corn-rice and corn-buckwheat bread and corn flakes equilibrated to different water activity were investigated. Breads were subjected to three-point banding test unlit failure while corn flakes were compressed in a pile. It was found that at low water activities analyzed materials are brittle and crunchy. Increasing water activity increases mechanical resistance of bread and water is an antiplasticizer. The critical water content is around 0.52. Above that value material is plasticized and it flows under the load. No disintegration of the material is observed. Critical water content for corn flakes is 0.64. At that value breaking force is 5 times lager than that at low water activity.
Źródło:
Inżynieria Rolnicza; 2005, R. 9, nr 11, 11; 301-307
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion Behavior of FeAl and Fe3Al Based Fe-Al-C Alloys in Sulfuric Acid
Autorzy:
Silva, A. P.
Brito, P. P.
Martins, N.
Powiązania:
https://bibliotekanauki.pl/articles/2134209.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
iron aluminides
microstructure
mechanical properties
corrosion resistance
Opis:
Iron aluminides are iron-aluminum alloys that have excellent resistance to oxidation at high temperatures with low density, high resistance/weight ratio and a low manufacturing cost. Due to its characteristics, these alloys are presented as an option to replace stainless steels in certain applications. This works intends report the casting process and subsequent analyses involving microstructure, mechanical properties, and corrosion resistance of two Fe-Al-C alloys (Fe-11wt%Al and Fe-25wt%Al, containing 0.31-0.37%C), which were prepared in an induction furnace and poured in a permanent mold. Samples of these alloys were characterized and presented elevated hardness values of 37 HRC (alloy Fe-11wt%Al) and 49.6HRC (alloy Fe-25wt%Al) and microstructure with aluminides type Fe3Al and FeAl and also carbides type K. The Fe-11wt%Al alloy exhibited superior resistance to uniform corrosion, although both Fe-Al-C alloys exhibited significantly higher corrosion rates compared to a binary iron aluminide in 0.5M H2SO4 containing naturally dissolved oxygen.
Źródło:
Archives of Foundry Engineering; 2022, 22, 2; 77--82
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Mechanical Properties of Offroad Vehicle Tire: Coupons Testing and FE Model Development
Autorzy:
Baranowski, P.
Bogusz, P.
Gotowicki, P.
Małachowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/387025.pdf
Data publikacji:
2012
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
tire
rubber
mechanical properties
finite element analysis
Opis:
In this paper the subsequent stages of tire rubber coupons mechanical properties experimental assessment are presented. Experimental uniaxial tension and compression tests were carried out on the strength testing machine with the assistance of high-speed camera and special software for strain measurements. Obtained stress-strain curves were applied into the chosen Mooney-Rivlin constitutive rubber material model in order to estimate necessary material constants. Simultaneously, the numerical off-road vehicle tire model was developed. Geometry of the tire and rim was achieved using a 3D scanning method. Moreover, with the assistance of microscope and X-ray device the tire cords pattern was verified, which in the next stages was implemented into the FE model. Consequently, tire radial deflection test was simulated in order to validate evaluated material constants and proposed concept of the numerical tire modelling. Obtained results were compared with the actual deflection test data included in technical documentation of the tire.
Źródło:
Acta Mechanica et Automatica; 2012, 6, 2; 17-22
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Właściwości mechaniczne i termiczne nanokompozytów P(MAA-co-MMA)/PVP/MWNT
Thermal and mechanical properties of P(MAA-co-MMA)/PVP/MWNTs nanocomposites
Autorzy:
Liu, G.
Powiązania:
https://bibliotekanauki.pl/articles/141892.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:
P(MAA-co-MMA)/PVP/MWNT
nanokompozyty
właściwości mechaniczne
analiza termiczna
P(MAA-co-MMA)/PVP/MWNTs
nanocomposites
mechanical properties
thermal analysis
Opis:
Sieci poli(kwasu metakrylowego-metakrylanu metylu) (P(MAA-co-MMA) zostały otrzymane na drodze kopolimeryzacji wolnorodnikowej w obecności liniowego poli(N-winylo-2-pirolidonu) (PVP) i wielościennych nanorurek węglowych (MWNT) tj. nanokompozytów P(MAA-co-MMA)/PVP/MWNT. Sprawdzono wpływ MWNT na właściwości mechaniczne i termiczne nanokompozytów P(MAA-co-MMA)/PVP/MWNT. Stwierdzono, że MWNT może zapewnić znaczną poprawę właściwości mechanicznych nanokompozytów P(MAA-co-MMA)/PVP/MWNT. Analiza termiczna wykazała, że widoczna poprawa stabilności termicznej dla nanokompozytów P(MAA-co-MMA)/PVP/MWNT występuje wraz ze zwiększającą się zawartością MWNT.
Poly(methacrylic acid-co-methyl methacrylate) (P(MAA-co-MMA)) networks were prepared via free radical copolymerization in the presence of linear poly(N-vinyl-2-pyrrolidone) (PVP) and multiwalled carbon nanotubes (MWNTs), i.e., P(MAA-co-MMA)/PVP/MWNTs nanocomposites. The effect of MWNTs on the thermal and of mechanical properties of P(MAA-co-MMA)/PVP/MWNTs nanocomposites have been investigated. It was found that, MWNTs could provide P(MAA-co-MMA)/PVP/MWNTs nanocomposites with much improved mechanical properties. Thermal analysis showed that a clear improvement of thermal stability for P(MAA-co-MMA)/PVP/MWNTs nanocomposites increased with increasing MWNTs content.
Źródło:
Chemik; 2015, 69, 1; 3-10
0009-2886
Pojawia się w:
Chemik
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and properties of dissimilar welded joint between P91 and TP347HFG steels after 105 000 h service
Mikrostruktura i właściwości różnoimiennego złącza spawanego pomiędzy stalą P91 i TP347HFG po 105 000 godzin eksploatacji
Autorzy:
Zieliński, A.
Golański, G.
Urbańczyk, P.
Słania, J.
Jasak, J.
Powiązania:
https://bibliotekanauki.pl/articles/182169.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Metalurgii Żelaza im. Stanisława Staszica
Tematy:
microstructure
mechanical properties
welded joint P91 / TP347HFG
mikrostruktura
właściwości mechaniczne
złącze spawane P91 / TP347HFG
Opis:
This paper presents the results of investigations of a dissimilar welded joint made between X10CrMoVNb9-1 (P91) martensitic steel and TP347HFG austenitic steel. The welded joint material was taken from a primary steam superheater coil operated at maximum working temperature of approx. 540°C for more than 105 000 hours. Destructive testing and metallographic tests were carried out for the welded joint material to determine the impact of long-term service on the properties of the joint. Microstructure of the welded joint was observed using a optical microscope (OM) and scanning electron microscope (SEM). The destructive testing included: impact test, static tensile test and hardness measurement.
W pracy zostały przedstawione wyniki badań złącza spawanego różnoimiennego, wykonanego pomiędzy stalą martenzytyczną w gatunku X10CrMoVNb9-1 (P91), a stalą austenityczną TP347HFG. Materiał złącza spawanego został pobrany z wężownicy przegrzewacza pary świeżej, pracującego w maksymalnej temperaturze pracy około 540oC w czasie ponad 105 000 godzin. Dla materiału złącza spawanego przeprowadzono badania niszczące oraz badania metalograficzne, w celu określenia wpływu długotrwałej eksploatacji na właściwości złącza. Obserwacji mikrostruktury złącza spawanego dokonano za pomocą mikroskopu świetlnego (OM) oraz elektronowego mikroskopu skaningowego (SEM). Badania niszczące obejmowały: próbę udarności, statyczną próbę rozciągania oraz pomiar twardości.
Źródło:
Prace Instytutu Metalurgii Żelaza; 2015, T. 67, nr 1, 1; 37-43
0137-9941
Pojawia się w:
Prace Instytutu Metalurgii Żelaza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania nowych materiałów na elementy kotłów o nadkrytycznych parametrach pracy
Investigations of new materials for elements of boilers with supercritical working parameters
Autorzy:
Dobrzański, J.
Zieliński, A.
Purzyńska, H.
Dziuba-Kałuża, M.
Powiązania:
https://bibliotekanauki.pl/articles/182030.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Metalurgii Żelaza im. Stanisława Staszica
Tematy:
stal T23
stal T24
stal P92
stal P91
stal VM12
mikrostruktura
pełzanie
właściwości mechaniczne
steel T23
steel T24
steel P92
steel P91
steel VM12
microstructure
creep
mechanical properties
Opis:
Celem pracy było przedstawienie wybranych charakterystyk materiałowych dotyczących zmian właściwości wytrzymałościowych odniesionych do zmian strukturalnych zachodzących w stali podczas długotrwałej eksploatacji w warunkach pełzania. W opracowaniu mającym charakter przeglądowy zawarte zostały dane dotyczące stali stosowanych do budowy kotłów nadkrytycznych. Przedstawiono wybrane wyniki badań stali T23 (7CrWVMoNb9-6), T24 (7CrMoVTiB10-10), P91 (X10CrMoVNb9-1), P92 (X10CrWMoVNb9-2) VM12 (X12CrCoWVNb12-2-)2 w stanie wyjściowym oraz po długotrwałej ekspozycji w warunkach pełzania.
The purpose of the paper was to present selected material characteristics with regard to changes in strength properties related to structural changes occurring in steel during long-term service under creep conditions. This review includes data concerning steels used for construction of supercritical boilers. Selected test results are presented for T23 (7CrWVMoNb9-6), T24 (7CrMoVTiB10-10), P91 (X10CrMoVNb9-1), P92 (X10CrWMoVNb9-2) and VM12 (X12CrCoWVNb12-2-)2 steels in initial state and after long-term exposure under creep conditions.
Źródło:
Prace Instytutu Metalurgii Żelaza; 2015, T. 67, nr 2, 2; 106-111
0137-9941
Pojawia się w:
Prace Instytutu Metalurgii Żelaza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on Creep Behavior of Composite Solid Propellants Using the Kelvin-Voigt Model
Autorzy:
Bihari, B. K.
Rao, N. P. N.
Gupta, M.
Murthy, K. P. S.
Powiązania:
https://bibliotekanauki.pl/articles/358395.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
mechanical properties
viscoelasticity
propellant
creep
DMA
Opis:
A Kelvin-Voigt model consisting of a spring and a dashpot in parallel was applied for the viscoelastic characterization of solid rocket propellants. Suitable values of spring constants and damping coefficients were employed by a least squares fit of the errors to generate creep curves using a Dynamic Mechanical Analyzer (DMA) for composite solid propellants. Three different composite propellant formulations based on HTPB/AP/Al having burning rates of 5 mm/s, 15 mm/s and 20 mm/s were tested under different stress levels varying from 0.1 MPa to 3 MPa and at different temperatures varying from 35 °C to 85 °C. Creep behavior with recovery was studied and analyzed to evaluate the viscoelastic properties. The change in spring constants, representing elastic deformation, was very small compared to the damping coefficients for the propellants studied. For a typical propellant formulation, when the stress level was increased, the spring and damping coefficient both increased significantly whereas for an increase in temperature, they remained nearly constant. However, the ratio E/η was observed to be constant and independent of stress level. It was also observed that the variation of E and η varied linearly with increase in stress whereas their ratio showed a logarithmic variation. A mathematical correlation was developed to evaluate the viscoelastic properties during creep of composite propellants.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 3; 742-756
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of the modulus fir wood reinforced with PBO fiber mesh
Autorzy:
Sokołowski, P.
Kossakowski, P. G.
Powiązania:
https://bibliotekanauki.pl/articles/231267.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
badanie laboratoryjne
konstrukcja drewniana
właściwości mechaniczne
zginanie czteropunktowe
laboratory tests
wooden structure
mechanical properties
four-point bending
Opis:
This paper presents the results of preliminary tests for estimating the modulus of elasticity of wooden beams from firs reinforced with PBO fiber mesh. The tests were carried out in the Materials Strength Laboratory at the Kielce University of Technology in Kielce, Poland with PN-EN 408:2004. The wooden elements were subjected to a four-point bending test with the aim of estimating the elastic modulus when bending, assuming the loading velocities of the loading forces of 5 mm / min. The obtained results show a significant increase in the load-bearing capacity of beams reinforced with PBO mesh.
Źródło:
Archives of Civil Engineering; 2018, 64, 4/I; 105-121
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Adding Iron Powder From Plasma Cutting on the Microstructure, Mechanical Properties of the Composite Based on Aluminum Powder Matrix Made Using Powder Metallurgy
Autorzy:
Wędrychowicz, M.
Bydałek, A. W.
Migas, P.
Skrzekut, T.
Noga, P.
Madej, P.
Kałasznikow, A.
Powiązania:
https://bibliotekanauki.pl/articles/2049543.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Fe composite
iron powder
plasma cutting
aluminum matrix composites
powder metallurgy
mechanical properties
Opis:
The paper presents the results of research on the effect of added iron powder from plasma cutting on the mechanical properties and structure of a composite rod based on aluminum powder. The iron powder came from plasma cutting of steel elements and was handed over by the enterprise “AK Anatol” from Żary. One of the ways to dispose of it is to use it as a filler in aluminum composite rods. Research shows that Fe can be distributed in aluminum evenly, and increase in mechanical properties is achieved at the expense of only a slight increase in density. The proposed system does not reduce the amount of waste produced by plasma cutting but finds a use for some of it. The sintering point of the powder required a strongly reducing atmosphere (Po2 < 10-50 atm) which seems virtually unachievable under laboratory conditions. The reinforcing mechanism is related to the fragmentation of the matrix aggregate particles and the uniform distribution of Fe particles in the aluminum matrix.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 273-279
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes In Properties and Microstructure of High-Chromium 9-12%Cr Steels Due to Long-Term Exposure at Elevated Temperature
Autorzy:
Zieliński, A.
Dobrzański, J.
Purzyńska, H.
Golański, G.
Powiązania:
https://bibliotekanauki.pl/articles/351104.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
steel P91
P92
VM12
microstructure
mechanical properties
long-term annealing
Opis:
This paper presents the characteristics of the performance of P91 (X10CrMoVNb9-1), P92 (X10CrWMoVNb9-2) and VM12 (X12CrCoWVNb12-2-2) steels used for condition assessment of the pressure components of boilers with supercritical steam parameters. Studies on the mechanical properties, microstructure tests using scanning and transmission electron microscopy, and X-ray analysis of the phase composition of precipitates were performed for selected steels in the as-received condition and after long-term annealing. These steel characteristics are used for the evaluation of the microstructural changes and mechanical properties of the material of components after long-term service. The result of this study is the database of material characteristics representing the mechanical properties related to the microstructure analysis and it can be used for diagnosis of the components of pressure parts of power boilers.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2B; 957-964
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The mechanical properties at room and low temperature of P110 steel characterised by means of small punch test
Autorzy:
Romelczyk-Baishya, B.
Lumelskyj, D.
Stępniewska, M.
Giżyński, M.
Pakieła, Z.
Powiązania:
https://bibliotekanauki.pl/articles/354831.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
small punch test
carbon steel P110
small sample
low temperature
mechanical properties
Opis:
In this paper small punch test (SPT) which is one of miniaturized samples technique, was employed to characterize the mechanical properties of carbon steel P110. The tests were carried out in the range of -175°C to RT. Results obtained for SPT were compared to those calculated for tensile and Charpy impact test. Based on tensile and SPT parameters numerical model was prepared. 8 mm in diameter and 0.8 mm in height (t) discs with and without notch were employed in this research. The specimens had different depth notch (a) in the range of 0.1 to 0.4 mm. It was estimated that α factor for comparison of Tsp and DBTT for carbon steel P110 is 0.55 and the linear relation is DBTT = 0.55TSPT. The numerical model fit with force – deflection curve of SPT. If the factor of notch depth and samples thickness is higher than 0.3 the fracture mode is transformed from ductile to brittle at -150°C.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 159-165
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure And Mechanical Properties Of Al-WC Composites
Mikrostruktura i właściwości mechaniczne kompozytów Al-WC
Autorzy:
Simon, A.
Lipusz, D.
Baumli, P.
Balint, P.
Kaptay, G.
Gergely, G.
Sfikas, S.
Lekatou, A.
Karantzalis, A.
Gacsi, Z.
Powiązania:
https://bibliotekanauki.pl/articles/352222.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite
aluminium
WC
microstructure
mechanical properties
kompozyt
mikrostruktura
właściwości mechaniczne
Opis:
The scope of the research work is the production and characterization of Al matrix composites reinforced with WC ceramic nanoparticles. The synthesis process was powder metallurgy. The produced composites were examined as far as their microstructure and mechanical properties (resistance to wear, micro/macrohardness). Intermetallic phases (Al12W and Al2Cu) were identified in the microstrucutre. Al4C3 was not detected in the composites. Adding more than 5 wt% WC to the aluminum, microhardness and wear resistance exceed the values of Al alloy. Composites having weak interface bond performed the highest wear rate.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1517-1521
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and testing 3D printed structures for bone replacements
Autorzy:
Ikonomov, P. G.
Yahamed, A.
Fleming, P. D.
Pekarovicova, A.
Powiązania:
https://bibliotekanauki.pl/articles/367249.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
3D printing
bone structure
3D modelling
testing
mechanical properties
druk 3D
struktura kości
modelowanie 3D
badania
właściwości mechaniczne
Opis:
Purpose: 3D printing has shown enormous potential for building plastic products, including bone, organs, and body parts. The technology has progressed from visualization and preoperation training to the 3D printing of customized body parts and implants. This research aims to create 3D printed bone structure from plastics and test the mechanical properties of the cortical and trabecular bone structures if they match the real bone structure strength. Design/methodology/approach: We used Digital Imaging, and Communications in Medicine (DICOM) images from Computer Tomography (CT) scans to created external bone structures. These images' resolution did not allow the creation of fine trabecular bone structures, so we used 3D modeling software to engineer special 3D void honeycomb structures (with triangular, square, and hexagonal shapes). Another reason to design void structures is that the 3D printing of complex shapes without support materials is problematic. After designing and 3D printing of the 3D bone structures, their mechanical properties need to be tested. Findings: 3D bone models, solid (cortical), and void (trabecular) bone structures were designed, 3D printed, and then tested. Tensile, bending, and compression testing was performed. Testing the mechanical properties of the honeycomb structures (triangular, square, and hexagonal) shows that their strength and modulus are higher than those of the real trabecular bones. The results show that 3D printed honeycomb structures mechanical properties can match and some cases exceeding the properties of the actual bones trabecular structures, while the sold structures have lower mechanical properties than the bone cortical structures. Research limitations/implications: During the 3D printing experiments, we found that 3D printers, in general, have low resolution, not enough to print fine trabecular bone structures. To solve the existing 3D printing technology's insufficient resolution, we later designed and built an SLA (stereolithography) 3D printer with high printing resolution (10 micrometers). Another limitation we found is the lack of biocompatible materials for 3D printing of bone structures. Future research work is in progress formulating superior ink/resin for bone structures 3D printing. Further, clinical trials need to be performed to investigate 3D printed parts’ influence on the healing of bone structures. Practical implications: We found that the 3D void (honeycomb) structures will have an impact not only on building bone structures but also in engineering special structures for industrial applications that can reduce the weight, time, and the cost of the material, while still keep sufficient mechanical properties. Originality/value: Designing and testing 3D printed bone models, solid (cortical), and void (trabecular) bone structures could replace bones. Design and test special void honeycomb structures as a replacement for cortical bone structures.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2020, 101, 2; 76-85
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of High Pressure-High Temperature Method on the Selected Mechanical Properties of Steel AISI 316L with 2% TiB2
Autorzy:
Kurtyka, P.
Sulima, I.
Hyjek, P.
Jaworska, L.
Powiązania:
https://bibliotekanauki.pl/articles/356857.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high pressure-high temperature
physical properties
mechanical properties
steel matrix composites
titanium diboride
Opis:
AISI 316L/TiB2/2p composites were manufactured by HP-HT using different pressures (5 and 7 GPa) and temperatures (900-1300°C), with constant reinforcing particle content 2 vol%. The mechanical properties of the composites were evaluated on the basis of hardness (HV0.3) and compression tests (20°C, 10-5 s-1). The results showed that the role of sintering pressure increased with increasing process temperature. At temperatures of 900°C and pressures of 5 and 7 GPa the difference in measured values of compressive strength was 1-2%, while at 1300°C they reached 20%. At constant pressure of 5 GPa, a change in hardness and compressive strength of 40% were obtained with a temperature change of 900 to 1300°C. Changes in mechanical properties in the composite occurred without substantial changes in density, microstructure, reinforcement phase distribution, and phase composition in the matrix.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1585-1592
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure, Mechanical and Detonation Properties of Elastomeric Micro/Ultrafine-rubber Modified TNT-based Molten Energetic Composites
Autorzy:
Ma, Q.
Wang, P.-S.
Luo, G.
Wen, M.-P.
Gao, D.-Y.
Zheng, B.-H.
Shu, Y.-J.
Powiązania:
https://bibliotekanauki.pl/articles/358122.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
micro and ultrafine rubber
2,4,6-trinitrotoluene
molten energetic composites
mechanical properties
detonation performance
Opis:
Elastomeric micro- and ultrafine-rubber are first considered as binders in melt-cast explosives for improving the mechanical properties. Acrylonitrile-butadiene rubber (NBR), in ultrafine fully vulcanized form (UF-NBR), carboxylated acrylonitrile-butadiene rubber (CNBR), in ultrafine fully vulcanized form (UF-CNBR), styrene-butadiene rubber (SBR), in ultrafine fully vulcanized form (UF-SBR), carboxylated styrene-butadiene rubber (CSBR), in ultrafine fully vulcanized form (UF-CSBR), acrylic rubber (ACM), in ultrafine fully vulcanized form (UF-ACM), room temperature vulcanized silicone rubber (RTV), in ultrafine fully vulcanized form (UF-RTV) and polytetrafluoroethene (PTFE) in micro-rubber form (PTFE-M) were utilized for modifying 2,4,6-trinitrotoluene (TNT) based melt-cast explosives. Based on their dispersity in TNT and RDX slurry, only UF-NBR, UF-CNBR and PTFE-M can be used. In the modification experiment, their influence on the mechanical and detonation performance of the matrixes were studied, as well as the impact sensitivity. Compared with PTFE-M and UF-CNBR, UF-NBR improved the tensile and compressive strength of the original formulation CYCLOTOL-65/35. The toughening mechanism was also explained through interfacial interactions and fracture energy analysis. The predicted detonation properties of the modified formulations (detonation pressure variations from 26 to 28 GPa, detonation velocity variations from 7900 to 8100 m/s) are at the same energy level as CYCLOTOL-65/35. In addition, the drop hammer impact testing results confirm that the formulation containing UF-NBR is more sensitive than the one with UF-CNBR, with the same amount of additive.
Źródło:
Central European Journal of Energetic Materials; 2015, 12, 4; 723-743
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 178

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