scholarly journals Composite metal-ceramic and metal-polymeric materials for friction assemblies of national civil aircrafts

2018 ◽  
Vol 30 ◽  
pp. 143-154
Author(s):  
Аndrii Bychkov ◽  
Оlha Nechyporenko
Keyword(s):  
Polymeric Material ◽  
Polymeric Materials ◽  
Generalized Characteristics ◽  
Foreign Production ◽  
Antifriction Materials ◽  
Metal Ceramic ◽  
Aeronautical Engineering ◽  
Friction Assemblies

Experience of using of metal-ceramic and a metal-polymeric material in friction assemblies of aeronautical engineering is generalized. Characteristics and conditions of operation of the sintered friction and antifriction materials are presented. Peculiarities of metal-fluoroplastic tapes of foreign production are considered. Efficiency of using of sintered and metal-polymeric materials in friction assemblies of modern civil aircrafts is shown.

New Electrically Heated and Bird-Strike-Resistant Polymer Glazing for Aircraft

2018 ◽  
Vol 45 (5) ◽  
pp. 231-236
Author(s):  
E.N. Kablov ◽  
L.V. Semenova ◽  
V.A. Bogatov ◽  
I.V. Mekalina ◽  
A.G. Krynin ◽  
...  
Keyword(s):  
Polymeric Material ◽  
Polymer Material ◽  
Polymeric Materials ◽  
Bird Strike ◽  
Conductive Coating ◽  
Selection Of

The main stages in the development of a bird-strike-resistant heated curved organic laminate for aircraft glazing are described: the selection of the polymeric materials; the application of a heated coating to the polymeric material; the moulding of glazing elements; the application of leads to the conductive coating; autoclave pressing of the laminated polymer material.

An Empirical Model for Predicting the Kinetics of Desorption of Ingredients from Polymeric Materials of Different Thickness

2017 ◽  
Vol 44 (4) ◽  
pp. 35-40
Author(s):  
A.V. Dedov
Keyword(s):  
Polymeric Material ◽  
Empirical Model ◽  
Polymeric Materials ◽  
Reduction Factor ◽  
Desorption Kinetics ◽  
Kinetics Of ◽  
Different Thickness

The use of an empirical model for predicting the desorption kinetics of ingredients and impurities from polymeric materials is analysed. A shortcoming of the model considered is the dependence of the reduction factor on the thickness of the polymeric material, which limits the use of different data. An approach for solving this problem is proposed.

scholarly journals Analysis of Tribotechnical Properties and Comparative Evaluation of Polymeric Materials and Rubbers Used in Rolling Stock

2021 ◽  
Vol 19 (3) ◽  
pp. 16-24
Author(s):  
M. Yu. Kulikov ◽  
V. P. Biryukov ◽  
A. N. Prints
Keyword(s):  
Polymeric Materials ◽  
Polymer Materials ◽  
Rolling Stock ◽  
Butadiene Rubber ◽  
Friction Coefficients ◽  
Ongoing Research ◽  
Friction Zone ◽  
Tribological Tests ◽  
Friction Assemblies ◽  
Fixed Abrasive

Rubber materials are widely used in friction assemblies of railway rolling stock. Rubbers are used oil seals, other various seals, shock absorbers, corrugated hoses, sleeves, sealing rings, etc. During operation, rubbers are exposed to various mechanical influences that cause wear, cracks, abrasion, dents, burnthroughs, etc., which can lead to the failure of the entire unit and unforeseen unscheduled repairs of the rolling stock. Any failure on the route together with unplanned repairs incur heavy economic losses.Currently, the issue of wear of rubbers in rubber-steel tribopairs has not been sufficiently studied in case of supply of lubricant to the friction zone and of wear caused by a free and fixed abrasive. There is ongoing research on the possibility of replacing rubber products with other polymeric materials, which have shown significantly better results in tribological tests, both in terms of friction coefficients and in the wear mechanism. The data obtained will make it possible to choose the most optimal options for materials that can act as a replacement for standard rubber products in rolling stock friction assemblies.The paper presents the results of tribological tests of thermoplastic polyurethanes (TPU), ultra-high-molecular-weight polyethylene (UHMWPE) and polypropylene (PP2015) in comparison with rubber based on nitrile butadiene rubber (NBR). The tests were carried out according to two schemes: «plane (tested sample) – bushing» and «plane (tested sample) – generatrix of a rubber disk with supply of abrasive grain to the friction zone». The objective of the work is to determine the dependence of the change in friction coefficients on load and sliding speed, as well as the dependence of seizure pressures of tribo-pairs on speed, weight loss of samples after wear tests with a free and fixed abrasive, the morphology of wear surfaces, and wear mechanisms of polymer materials and rubbers.

Influence of Test Conditions and Couple Materials on Frictional Characteristic of Polymeric Materials

2011 ◽  
Vol 306-307 ◽  
pp. 684-687
Author(s):  
Li Xiao Jia ◽  
Yong Zhen Zhang ◽  
Yong Ping Niu ◽  
San Ming Du ◽  
Jian Li
Keyword(s):  
Friction Coefficient ◽  
Polymeric Material ◽  
Polymeric Materials ◽  
Friction Characteristic ◽  
Test Conditions ◽  
Frictional Characteristic

Frictional characteristic of three kinds of polymeric material was studied by Mark II slipmeter under the condition of different couple materials and test conditions in order to understand the frictional mechanism of people’s walking deeply and decrease the probability of accidents caused by slips and falls. The results indicate that test conditions and couple materials influent friction characteristic of polymeric materials but the influence of test conditions is more significant. In the three test conditions, the friction coefficient of dry condition is highest and that of oil condition is lowest. The friction coefficient of polymeric materials on different floor samples had different trend indicated that there was interaction between shoe sole samples and floor samples.

Recent advances in “bioartificial polymeric materials” based nanovectors

2017 ◽  
Vol 2 (4) ◽  
Author(s):  
Raffaele Conte ◽  
Ilenia De Luca ◽  
Anna Valentino ◽  
Anna Di Salle ◽  
Anna Calarco ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Polymeric Material ◽  
Polymeric Materials ◽  
Polymer Chemistry ◽  
Loading Capacity ◽  
Polymer Therapeutics ◽  
Heterogeneous Architectures ◽  
Wide Range ◽  
Medical Interest

AbstractThis chapter analyzes the advantages of the use of bioartificial polymers as carriers and the main strategies used for their design. Despite the enormous progresses in this field, more studies are required for the fully evaluation of these nanovectors in complex organisms and for the characterization of the pharmacodynamic and pharmacokinetic of the loaded drugs. Moreover, progresses in polymer chemistry are introducing a wide range of functionalities in the bioartificial polymeric material (BPM) nanostructures leading to a second generation of bioartificial polymer therapeutics based on novel and heterogeneous architectures with higher molecular weight and predictable structures, in order to achieve greater multivalency and increased loading capacity. Therefore, research on bioartificial polymeric nanovectors is an “on-going” field capable of attracting medical interest.

scholarly journals Sludge Stabilization Process, Drying Depth and Polymeric Material Addition: Implication on Nitrogen Content, Selected Chemical Properties and Land Requirement in Sand Drying Beds

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6753
Author(s):  
Taruvinga Badza ◽  
Eyob H. Tesfamariam ◽  
Craig Cogger
Keyword(s):  
Polymeric Material ◽  
Wastewater Treatment Plants ◽  
Chemical Properties ◽  
Polymeric Materials ◽  
Nutrient Content ◽  
Land Area ◽  
N Content ◽  
Total N ◽  
Sludge Drying ◽  
Land Size

Drying beds are a simple and economical means to dewater municipal sludge and are widely used in places with a suitable climate for air-drying. However, research-based information on drying thickness/drying depth effects on nutrient content and land size requirements for sludge drying is scarce. In this study, aerobically digested (AeD), and anaerobically digested without polymer (AnDP0) and with polymer (AnDP1) sludge types were dried in sand drying beds at 5, 10, 15, 20 and 25 cm depths in South Africa. Measured nitrogen (N) fractions and other parameters were more strongly influenced by sludge types than by drying depth. Total N content followed the order of AeD > AnDP1 > AnDP0. Polymeric material addition tended to increase total and inorganic N content and reduce the length of sludge drying period and land size requirement. The study showed that larger land size is required to dry sludge at shallower depths, even though the sludge dried more quickly. Drying sludge at 15 cm was the best option across sludge types in winter, taking an average land area between 261 and 383 m2 over the fewest days of sludge drying, whereas in spring, drying at 20 to 25 cm depth was most favorable. The findings suggest that drying bed management can be based on land area requirements with little concern for biosolid quality changes. For wastewater treatment plants relying on drying in beds, adding polymeric materials may be beneficial where land area for drying beds is limited, but not otherwise. Therefore, land availability is critical in decision making for sustainable sludge drying thickness.

POLYMER MATERIALS FOR ANTIFRICTION COATINGS (review)

2021 ◽  
pp. 56-63
Author(s):  
E.A. Serkova ◽  
◽  
V.V. Khmelnitskiy ◽  
O.B. Zastrogina ◽  
◽  
...  
Keyword(s):  
Polymeric Materials ◽  
Polymer Materials ◽  
Metallic Materials ◽  
Thermoplastic Polymers ◽  
Antifriction Materials ◽  
Antifriction Coatings

An overview of polymeric materials of various structures used as antifriction materials is given. The experience of using various polymeric materials for the manufacture of antifriction coatings is considered. The advantages of thermosetting and thermoplastic polymers in comparison with metallic materials are revealed. Some compositions of carbon and organoplastics developed for plain bearings are described. A conclusion is made about the direction of research in the development of new binders for antifriction materials.

Use of Relocation Device at Scanning of Polymeric Material Surface Quality

2014 ◽  
Vol 693 ◽  
pp. 243-246
Author(s):  
Vladimír Pata ◽  
Martin Řezníček ◽  
Libuše Sýkorová ◽  
Jana Knedlova ◽  
Martina Malachova
Keyword(s):  
Surface Quality ◽  
Polymeric Material ◽  
Quality Measurement ◽  
Polymeric Materials ◽  
Surface Damage ◽  
Measuring System ◽  
Material Surface ◽  
Special Cases ◽  
Invasive Method ◽  
Set Up

Nowadays, manufacturers and users of parts made of polymeric materials make increasing demands on surface quality of these parts. In order to fulfill these claims, it is necessary to use not only the quality measurement systems for surface quality inspection, but also suitable products that allow to set up the inspected polymeric component properly set up to the measuring system scanner. However, it is not sufficient. Due to the requirements of the customers or the production it is often necessary to repeat the surface quality measurement, which is more and more often done in 3D; that might be quite difficult. Except for special cases there should not be any marks done by the inspection workplace which might lower the inspected surface quality. Therefore it is not suitable to make mechanical marks such as scratch, ridge, etc. On the other hand, other types of marks done by non-invasive method, such as sticking paper marks, measuring cross, etc. is also not admissible as there might result in surface damage due to adhesive forces as well by mechanical or chemical processes. Thus it is necessary to take into account the fact that parts made of polymeric material can be so small that none of the above mentioned methods that are widely used nowadays cannot be applied just because of the dimensional reason.

Determination of Gurson–Tvergaard–Needleman Model Parameters for Failure of a Polymeric Material

2010 ◽  
Vol 21 (1) ◽  
pp. 3-25 ◽  
Author(s):  
Alpay Oral ◽  
Gunay Anlas ◽  
John Lambros
Keyword(s):  
Carbon Monoxide ◽  
Polymeric Material ◽  
Simplex Method ◽  
Polymeric Materials ◽  
Numerical Results ◽  
Model Parameters ◽  
Metallic Materials ◽  
Selection Of ◽  
Fracture Specimens

In this work, the Gurson–Tvergaard–Needleman model, commonly used for metallic materials, is applied to the failure of a polymeric material – specifically a polyethylene carbon monoxide copolymer, which is an enhanced photodegradable material. Gurson–Tvergaard–Needleman model parameters for this material are obtained using the Nelder–Mead simplex method when correlating experimental and numerical results of both tensile and fracture specimens. Results show that the Gurson–Tvergaard–Needleman model can also be used for polymeric materials with selection of proper parameters that are quite different from the ones proposed for metallic materials.

On the definition of fire-safety characteristics for three-layer composite polymers in shipbuilding structures

2020 ◽  
pp. 139-147
Author(s):  
V. S. Tryasunov ◽  
I. V. Lishevich ◽  
G. I. Nikolaev ◽  
E. L. Shultseva ◽  
V. E. Baruev ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Polymeric Material ◽  
Fire Safety ◽  
Polymeric Materials ◽  
Data Interpretation ◽  
Composite Polymers ◽  
Layer Composite ◽  
Definition Of ◽  
Composite Polymeric Material

The article considers approaches and requirements for fire-safety characteristics definition of composite polymeric materials in shipbuilding. The results of experimental determination for such characteristics for three-layer composite polymeric material and fiberglass layer as an example are provided. The need for the development of domestic regulatory documentation on the correct requirements for testing multilayer PCM and data interpretation has been identified.

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