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Wyświetlanie 1-15 z 224
Tytuł:
Prediction of the reinforced concrete structure durability under the risk of carbonation and chloride aggression
Autorzy:
Czarnecki, L.
Woyciechowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/201976.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
concrete durability
chloride aggression
carbonation
durability prognosis
Opis:
The paper presents an idea of predicting durability of concrete structures with steel reinforcement under conditions of chloride and carbonation corrosion risk. Mechanisms of destruction due to steel corrosion in such conditions are shown. The recently elaborated model of carbonation and general model of chloride diffusion have been discussed. An algorithm of the rest service life time prognosis has been shown and options of its main stages realization have been done. An example of durability prognosis for pre-stressed hollow-core floor slab with upper layer of concrete and epoxy-resin coating has been given. This example confirms the usefulness of the described prognosis method and demonstrates its helpfulness in a structure management according to the standards of EN 1504 series.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 1; 173-181
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibrating destruction of flexible pavement and a ways of increase of their durability
Autorzy:
Osinovskaya, V. A.
Powiązania:
https://bibliotekanauki.pl/articles/402167.pdf
Data publikacji:
2012
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
durability
pavement
Opis:
In the article the new concept of the reasons of premature destruction of the flexible pavement, based on additional deformation vibrating loading is revealed. The mathematical model of formation of layers of the pavement ensuring reduction in vibrating loading for increase of serviceability and durability of pavement is presented.
Źródło:
Structure and Environment; 2012, 4, 4; 5-10
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Increasing durability of cutting tools
Autorzy:
Majerníková, J.
Spišák, E.
Powiązania:
https://bibliotekanauki.pl/articles/101918.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
coating
cutting tool
durability
Opis:
The article evaluates durability of punches and cutting tools when cutting of the cut-outs. Durability of punches made of the same material without coating, with the TiCN-MP coating and with the TiN coating is compared. Durability is evaluated by the tolerance of the cut-outs. Border durability, which requires grinding of the tool, is a determined durability, at which the deviation of the tolerance of a cut-out is at the lowest border. By comparing the dependency of change of the holes’ dimensions on the number of strokes in the case of all three types of punches, it can be stated that the durability increased by 10–12 times in the case of the tools with coatings.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 141-146
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The durability of prestressed concrete elements reinforced with fibres
Autorzy:
Corobceanu, V.
Giusca, R.
Powiązania:
https://bibliotekanauki.pl/articles/201052.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
durability
prestressed concrete
fibres
Opis:
The aim of the study is to show the improvements on durability of prestressed concrete elements by introducing in concrete mass a certain quantity of fibres. Random distributed fibres provide a significant increase in the tensile strength, having also favourable consequence on other mechanical and durability characteristics. The prestressed concrete elements are under a permanent stress state that is not optimal in all their sections and zones. One of the most unfavourable effects is the reduction of material durability, especially in aggressive environments, in which prestressed reinforcements are more sensitive to utilization than reinforced concrete components. The authors present the result brought up by the use of steel fibres in the improvement of the durability of concrete elements, in relation with the volumetric steel ratio, and the geometrical ratio of steel fibres, leading to a favourable effect on prestressing efficiency.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 1; 165-170
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue testing of dental bridges on selected examples
Autorzy:
Urban, D.
Jałbrzykowski, M.
Gołębiewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/386977.pdf
Data publikacji:
2017
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
dental bridge
ceramics
durability
Opis:
The paper presents example tests of the functional quality of selected designs of dental bridges. These were: porcelain bridges on a metal base (cobalt based alloy), porcelain bridges on a zirconia base (zirconia ceramic – Zirkon Zahn), and full zirconia bridges (Zirkon Zahn). For the purpose of the study, durability of bridges in cyclic fatigue testing was adopted as a measure of their quality. The tests were carried out on a Zwick Roell Z010 universal testing machine. They consisted in cyclic loading and unloading of dental bridges mounted on gypsum models at a loading force of F= 400 [N] and a frequency of load of f= 1 [Hz]. Each bridge was subjected to a cycle of 7200 loads. The results show that there are no significant differences in the functional quality of the bridges.
Źródło:
Acta Mechanica et Automatica; 2017, 11, 1; 53-57
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An assessment of rope durability in mining shaft hoists
Autorzy:
Stawowiak, Michał
Rożenek, Zenon
Powiązania:
https://bibliotekanauki.pl/articles/1819306.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
operation
ropes
assessment
durability
Opis:
The article presents the issues of the durability of lifting ropes and balance ropes operated in selected shafts of deep mines. The basic causes of hoisting ropes wear are described, the methods of steel ropes wear evaluation are given, as well as the hoisting ropes durability evaluation criteria. The authors also present selected results from the extension of hoisting ropes. The article ends with some conclusions resulting from the research. The article has also been provided with photos showing the measuring equipment used to assess the durability of steel and steel-rubber ropes. The article presents the criteria for assessing the durability of lifting ropes.
Źródło:
Mining – Informatics, Automation and Electrical Engineering; 2019, 57, 4; 21--29
2450-7326
2449-6421
Pojawia się w:
Mining – Informatics, Automation and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cold formed steel structure: An overview
Autorzy:
Billah, Moushtakim
Islam, Md. Mofizul
Ali, Rubieyat Bin
Powiązania:
https://bibliotekanauki.pl/articles/1075735.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cold formed steel
Connection
Durability
Opis:
Nowadays, the application of cold formed steel elements in construction is becoming very popular due to several advantages like Speedy construction, higher strength to weight ratio, dimensional stability and recycled material. Besides, cold formed steel section has some undesirable properties that create challenges for its use in construction. The very small thickness makes it vulnerable to the different type of buckling, web crippling, torsional failure and also susceptible to fire. To overcome these challenges and utilize the advantages of cold formed steel element by improving its properties, important research works are being carried out all over the world. There are guidelines and specifications available in different codes of cold formed steel structure and it makes engineers confident in the application of cold formed steel elements in construction. The objective of this study is to represent an introduction of cold formed steel structure by reviewing the behavior, material properties, production methods, classification of cold formed steel elements. It also discusses the codes and guideline available for cold formed steel structure, important design criteria, connection, methods and durability issues based on some excellent researches.
Źródło:
World Scientific News; 2019, 118; 59-73
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability model of the crankshaft - piston assembly
Autorzy:
Bzura, P.
Powiązania:
https://bibliotekanauki.pl/articles/248145.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
acoustic vibration
durability
friction node
Opis:
The laws that govern the durability of crankshaft-piston assembly friction nodes can be proved or at least derived or justified in an intuitive way. Operation of all the friction nodes is disturbed by external factors occurring with randomly changing intensity and also appearing at random. As the crankshaft-piston assembly friction nodes have a series structure and effects of those disturbances accumulate, their fitness for use period can be presented as an image of appearing disturbances with determined effects. This can be done on the probability distribution basis. The crankshaft-piston assembly usual wear and tear process is long, therefore images of the appearing disturbances should be characterised by the degree of wear, i.e. the change of the friction node durability, which is a subject of the Markov chain process. The friction node surface durability is an effect of many factors (e.g. stress pattern in the contact area, the surface material hardness, chemical properties of the surface material etc.). However, among those mentioned the least known effect is that of the properties of lubricating agent on the fatigue strength of friction node elements in the crankshaft-piston assemblies. Therefore, the paper presents a reliability model allowing estimating the fatigue wear of friction nodes in the crankshaft-piston assembly, operating in a lubrication contact with different loads, temperatures and speeds.
Źródło:
Journal of KONES; 2012, 19, 1; 29-34
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Cockele Shells on Mortars Performance in Extreme Conditions
Autorzy:
Abdelouahed, Assia
Hebhoub, Houria
Kherraf, Leila
Belachia, Mouloud
Powiązania:
https://bibliotekanauki.pl/articles/396150.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
shells
cement
strength
properties
durability
Opis:
This paper studies the use of cockle shell as supplementary cementitious materials SCMs as substitute for cement. The cockle shells generally have a high CaO content which can alter the behavior and the properties of mortars and concrete. Cockle shell is used with weight ratios of 5, 10, 15 and 20% to formulate a mortar with cockle shell and a control mortar CM with 0% of cockle shell. The properties in the fresh state, the mechanical strength and the weight loss test as well as the depth of penetration of each mixture were carried out through the conducted experiments. Consistency and density of fresh mortars were determined, the results obtained showed that cockle shell have a significant influence on the properties of mortars in the fresh state. The different results of hardened mortars show that the introduction of cockle shell tends to accelerate the development kinetics of strength at the young age but its ratio cannot be above of 5%. Mortar with 10% presented the lower depth penetration, the loss weight increased proportionally with the increasing of cockle shell amount.
Źródło:
Civil and Environmental Engineering Reports; 2019, 29, 2; 60-73
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for evaluating durability of porous slide bearings
Autorzy:
Bzura, P.
Powiązania:
https://bibliotekanauki.pl/articles/259298.pdf
Data publikacji:
2011
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
structure
durability
strength of bonds
Opis:
The article presents the structures of porous slide bearing bushes and greasy lubricants, and the similarity criterion resulting from these structures. A physical model is proposed which describes the operation of the porous slide bearing bush taking into account, via analogy, the phenomena taking place in the greasy lubricant nodes instead of those observed in the bush structures. Included are the results of experimental tests of three greasy lubricants which allow transferring the results recorded in model experiments to real objects.
Źródło:
Polish Maritime Research; 2011, 1; 27-31
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on Sound Absorption of Road Acoustic Screens Under Simulated Weathering
Autorzy:
Nowoświat, A.
Bochen, J.
Dulak, L.
Żuchowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/176782.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic screens
ageing process
sound absorption
durability
Opis:
The present paper is comparing the results of research studies carried out for three road acoustic screens of different design and different number of damping layers. For the tests, we selected timber or steel screens with a traditional multilayer structure and also one innovative type of simplified design. With respect to particular panels, their sound absorption properties were investigated in the reverberation chamber after they had been subjected to simulated weathering. In the process, two screens were subjected to the aging tests of 50-500 cycles in a special climatic chamber, and the innovative screens were subjected to 1000 cycles. The procedure was repeated every 50 or 100 cycles in order to obtain the changes of acoustic characteristics. The changes taking place in the absorbing material were also investigated with the use of scanning electron microscopy method (SEM). Basing on the obtained results and on the statistical analysis, the capability to maintain acoustic properties by the panels during their service life in natural conditions was estimated. For that purpose, linear statistical models were worked out, which were then applied to estimate the value of the single number sound absorption coefficient after successive aging cycles as well as the predicted time periods of acoustic class changes.
Źródło:
Archives of Acoustics; 2018, 43, 2; 323-337
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A model for service life control of selected device systems
Autorzy:
Zieja, M.
Ważny, M.
Powiązania:
https://bibliotekanauki.pl/articles/259281.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
reliability
unreliability
durability
service lifetime
destructive processes
Opis:
This paper presents a way of determining distribution of limit state exceedence time by a diagnostic parameter which determines accuracy of maintaining zero state. For calculations it was assumed that the diagnostic parameter is deviation from nominal value (zero state). Change of deviation value occurs as a result of destructive processes which occur during service. For estimation of deviation increasing rate in probabilistic sense, was used a difference equation from which, after transformation, Fokker-Planck differential equation was obtained [4, 11]. A particular solution of the equation is deviation increasing rate density function which was used for determining exceedance probability of limit state. The so-determined probability was then used to determine density function of limit state exceedance time, by increasing deviation. Having at disposal the density function of limit state exceedance time one determined service life of a system of maladjustment. In the end, a numerical example based on operational data of selected aircraft [weapon] sights was presented. The elaborated method can be also applied to determining residual life of shipboard devices whose technical state is determined on the basis of analysis of values of diagnostic parameters.
Źródło:
Polish Maritime Research; 2014, 2; 45-49
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strengthening of the wooden structures
Autorzy:
Ślósarz, Szymon
Powiązania:
https://bibliotekanauki.pl/articles/389950.pdf
Data publikacji:
2019
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
strengthening
wooden structures
degradation
durability
glued wood
Opis:
The paper is a review of the literature on the strengthening of wooden structures. The strengthening methods are classified according to their purpose and specifics. The article deals with both traditional methods commonly used and modern methods involving the use of composite materials. The paper also includes description of studies on various strengthening methods as well as the presentation of their results. The author also refers to the causes of the loss of load bearing capacity, causes of wood degradation and wooden structures durability in relation to operating conditions.
Źródło:
Budownictwo i Architektura; 2019, 18, 3; 17-28
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Durability of crystalline phase in concrete microstructure modified by the mineral powders: evaluation by nanoindentation tests
Autorzy:
Rajczakowska, M.
Łydżba, D.
Powiązania:
https://bibliotekanauki.pl/articles/178395.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
nanoindentation
concrete
Internal Crystallization Technology
microstructure
durability
Opis:
This paper presents the nanoindentation investigation of the evolution of concrete microstructure modified by the Internal Crystallization Technology mineral powders. The samples under study were retrieved from a fragment of a circular concrete lining of the vertical mine shaft at a depth of approximately 1,000 m. Due to the aggressive environment and exposure to contaminated water, the internal surface of the structure was deteriorated, decreasing its strength significantly. The mineral powders were applied directly on the surface lining. The specimens were investigated one month, three months and one year after the application of the aforementioned substance in order to verify the time dependence of the strengthening processes and durability of the crystalline phase. The microstructural changes of concrete were assessed with the use of nanoindentation technique. The testing procedure involved including the previously cut specimens in the epoxy resin and grinding and polishing in order to reduce the surface roughness. As a result of the nanoindentation tests the hardness as well as Young’s modulus of the material were evaluated. The results were then compared and statistically analyzed. As a consequence, the disintegration time of the crystalline network in the pores of concrete was identified.
Źródło:
Studia Geotechnica et Mechanica; 2016, 38, 1; 65-74
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of natural durability of selected coniferous wood species from north Asia affected by the fungus Coniophora puteana (Schumach.) P. Karst.
Autorzy:
Andres, Bogusław
Jankowska, Agnieszka
Duchnik, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2200096.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
natural durability of wood
wood durability class
Larix dahurica
Larix gmellini
Larix sibirica
Pinus sibirica
Opis:
The aim of prestened study was to determine the natural durability of selected coniferous wood species from Asia to the effect of Coniophora puteana (Schumach.) P. Karst., which causes brown rot. The species tested were: Larix gmellini (Rupr.) Kuzen., Larix sibirica Ledeb. and Pinus sibirica Du Tour.. The test was conducted on the basis of PN-EN 350:2016-10 and PN-EN 113:2000. As a result of the research durability classes were determined. Wood durability of tested Asian species was compared with the domestic wood species such as Pinus sylvestris L. and Larix decidua Mill.. The most durable of the tested wood species was Larix sibirica Ledeb., while the European larch showed comparable durability. The wood of Larix gmellini (Rupr.) Kuzen. showed the lowest persistence among the tested species.
Badanie naturalnej trwałości wybranych drewna iglastego gatunków z Azji Północnej poddanych działaniu grzyba Coniophora puteana (Schumach.) P. Karst. Praca dotyczy określenia naturalnej trwałości drewna wybranych gatunków iglastych pochodzących z Azji wobec działania grzyba C. puteana, powodującego brunatny rozkład drewna. Zakresem badań objeto drewno twardzieli drewna Larix gmellini (Rupr.) Kuzen., Larix sibirica Ledeb. and Pinus sibirica Du Tour.. Badanie zostało przeprowadzone w oparciu o normy PN-EN 350:2016-10 i PN-EN 113:2000. W wyniku badania określono klasy trwałości oraz porównano trwałość z drewnem krajowym sosny zwyczajnej (Pinus sylvestris L.) i modrzewia europejskiego (Larix decidua Mill.). Badania wykazały, iż najtrwalszym z pośród badanych gatunków drewna jest L. sibirica, przy czym L. decidua wykazał porównywalną trwałość. Najniższą trwałość z pośród badanych gatunków odnotowano dla drewna L. gmellini.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2020, 112; 32--35
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 224

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