Articles

 


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1.
dx.doi.org/ 10.18577/2307-6046-2014-0-10-1-1
УДК 669.715
Ivanova A.O., Vakhromov R.O., Grigoriev M.V., Senatorova O.G.
INVESTIGATION OF EFFECT OF SILVER SMALL ADDITIVES ON STRUCTURE AND PROPERTIES OF RESOURCE Al–Cu–Mg ALLOYS

Thermodynamic calculation of phase structure of resource Al–Cu–Mg system alloys with and without Ag additive was carried out. The effect of small additive of silver on structure and properties of 1,5–2,0 mm thickness sheets of Al–Cu–Mg alloys in naturally aged condition was investigated. It is shown that silver in amount up to 0,6 wt. % leads to increasing of strength characteristics (up to 10%,) fatigue durability (more, than by 15%), crack resistance (up to 10%) and resistance to corrosion cracking with preservation of relative elongation level. Addition of silver in Al–Cu–Mg system alloys is a perspective way of increasing a service life and reliability of articles of aeronautical engineering.

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2.
dx.doi.org/ 10.18577/2307-6046-2014-0-10-2-2
УДК 543.51:669.1
Yakimovitch P.V., Alekseev A.V., Min P.G.
DETERMINATION OF LOW PHOSPHORUS CONTENT IN HEAT-RESISTING NICKEL ALLOYS BY ICP-MS METHOD

Determination of phosphorus mass content (less than 0,001% wt.) in standard specimens of nickel alloys was carried out by mass-spectrometry method with inductively coupled plasma (ICP-MS). Spectral interferences were eliminated using mathematical correction equation. The technique of sample dissolving and its preparation for analysis was presented. Relative standard deviation doesn’t exceed 0,05 in the concentration range of 0,0006–0,0065% wt. A detection limit in solution is 0,7μg/l, a detection limit in alloys – 0, 0004 % wt.

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3.
dx.doi.org/ 10.18577/2307-6046-2014-0-10-3-3
УДК 678.8
Beider E.Ya., Petrova G.N., Dykun M.I.
DRESSING OF CARBON FIBERS – FILLERS OF THERMOPLASTIC CARBON REINFORCED PLASTICS

This paper represents results of investigation on choosing coupling agents for carbon fibers for production of carbon fiber-reinforced plastics based on thermoplastic heat-resistant matrixes – polyarilsulfones PSF-T1 and PSF-T2. Carbon fiber-reinforced plastics (CFRP) have got a number of advanced properties – low density, high elasticity modulus, strength, heat resistance, high durability, low temperature linear expansion coefficient. The drawback of these materials is a low shear strength because of poor adhesion of binder to carbon fiber surface. Dressing of carbon fibers were made by epoxy resins solutions, polyimides, polyether oligomers, rolivsan, polysulfone etc. Influence of coupling agent nature on mechanical properties of thermoplastic heat-resistant CFRP at room (20°C) and high temperatures (160 and 185°C) is shown. Strength characteristics data are presented.

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4.
dx.doi.org/ 10.18577/2307-6046-2014-0-10-4-4
УДК 678.8:621.311.001.57
Goncharov V.A., Sorokin K.V., Fedotov M.Y., Raskutin A.E.
MODELING OF TECHNOLOGICAL PROCESS OF PCM ON A BASE OF VSE-21 RESIN AND TENAX-E STYLE 450 FABRIC MANUFACTURE BY INFUSION METHOD

A sequence of operations for modeling of PCM based on VSE-21 resin and Tenax-E Style 450 fabric manufacture by infusion method is described. Phenomenological processes appearing at forming and also critical characteristics which have to be taken into account during the imitation process are given. Abilities of modeling usage for forming parameters identification even on the stage of calculation and algorithm of model realization to get a high convergence during modeling are described.

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5.
dx.doi.org/ 10.18577/2307-6046-2014-0-10-5-5
УДК 669.018.95
Grishina O.I., Kochetov V.N., Shavnev A.A., Serpova V.M.
ASPECTS OF APPLICATION OF HIGH-STRENGTH AND HIGH-MODULUS FIBER METAL COMPOSITE MATERIALS FOR AERONAUTICAL PURPOSE (REVIEW)

A review of metal composite materials based on aluminum and titanium matrixes, rein-forced with high-strength fibers of refractory compounds for application in constructions of aerotechnics and space transport systems is presented.

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6.
dx.doi.org/ 10.18577/2307-6046-2014-0-10-6-6
УДК 620.1
Zimichev A.M., Balinova Yu.A., Varrik N.M.
TO THE QUESTION OF ELASTICITY MODULUS OF FIBERS FROM REFRACTORY OXIDES

Results of tests by acoustic method of continuous fibers on a base of refractory oxides meant for production of flexible sealing thermal insulation are given. X-ray phase structure and elasticity modulus were defined for samples of Al2O3–SiO2 fibers after heat treatment at 700, 900 and 1200°С. Results showed that a full crystallization of ceramic structure at high-temperature burning leads to increasing of elasticity modulus of oxide fi-bers.

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7.
dx.doi.org/ 10.18577/2307-6046-2014-0-10-7-7
УДК 629.7.023
Kirienko O.A., Shurkova E.N., Volnyj O.S., Barbotko S.L.
STUDY OF INFLUENCE OF DIFFERENT PROTECTIVE COATINGS ON CHARACTERISTICS OF FIRE SAFETY OF FUSELAGE THERMAL ACOUSTIC INSULATION

Samples of perspective material of thermal acoustic isolation were manufactured. The sound heat-insulating material contained the following layers:heat - sound - insulating layer on a base of basalt and silica fibers; a layer of non-woven material, based on aramid fibers; protective coating on a base of fiberglass or heat-resistant polymer film (polyimide film PMA, fluoropolymer film F-4MD, material STF-26, material on a base of fiberglass with fluoroplast F-42 impregnation, polyethersulfone film). Investigation on characterization of fire safety (duration of residual independent burning, length of burn-through) of thermal acoustic insulation material of fuselage with different protective coatings according to the requirements of aviation regulations AP-25, p. 25.856(a) Appendix F, Part VI. Tests were performed in a chamber with a heat radiation panel under an influence on the material both a heat radiation flow of variable intensity and a burner flame. Both separate specimens of pro

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8.
dx.doi.org/ 10.18577/2307-6046-2014-0-10-8-8
УДК 669.01
Morozova L.V., Iskhodzhanova I.V.
STUDY OF RELATIONSHIPS OF SURFACE RELIEF CHANGING OF SPECIMENS FROM ALUMINUM-LITHIUM ALLOYS BY LASER MICROSCOPY METHOD

By method of laser scanning confocal microscopy a study of relief changing (surface roughness(Ra), depth of corrosion pittings) of specimens tested under extension till frac-ture both without corrosion environment and under corrosion attack was carried out. 3D-models were drawn up and a quantitative evaluation of surface relief by statistical data processing of roughness, using standard software of LSCM Olympus Lext OLS3100 was carried out. It was shown, that a surface roughness (Ra), as approaching to the fracture location was increasing in 1,5 (for 1441alloy specimens) or in 3 times (for V-1469 alloy specimens) that indicates of more expressed localization of deformation in 1441 alloy.

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9.
dx.doi.org/ 10.18577/2307-6046-2014-0-10-9-9
УДК 614.814.41
Nesterova T.A., Platonov M.M., Sharakina L.A.
EVALUATION OF PROPERTIES OF FIRE SAFETY FABRIC-FILM MATERIAL FOR EMERGENCY SLIDE

Results of research of properties of VRT-10 fabric-film material for emergency slide, manufactured on a base of commercial polyether fabric with double-sided fireproof coating and electro-conducting coating from a face are presented . Influence of higher and lower temperature, climatic impacts on strength characteristics and conductivity of the material was studied. The carried out study showed that the material keeps more than 90% of its strength properties after all influences, except for weft breaking strength after 100°С temperature effect for 200 hours (81,4% preservation of strength).However, in many cases a strength of material remained actually without change. A tearing resistance characteristic decreases after a cyclic drop of temperatures for 10–15%, and increases after above-zero temperatures influence. At direct increase of temperature influence, more considerable decrease of strength and elongation at rupture of VRT-10 grade material takes place. However, a residual valu

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10.
dx.doi.org/ 10.18577/2307-6046-2014-0-10-10-10
УДК 620.165.79:678.8
Stolyankov Yu.V., Iskhodzhanova I.V., Antyufeeva N.V.
ON THE QUESTION OF CARBON FIBER REINFORCED PLASTICS (CFRP) TEST SPECIMEN FLAWS

For strength characteristics and properties evaluation test of composite polymer ma-terials (PCM), i.e. CFRP on the basis of glue epoxy resin and carbon fillers, it is neces-sary to make test specimen first. As a rule test specimen make from CFRP plates pro-duced by means of some molding technique. Cutting tool machining is the most wide-spread method among various existing methods of test specimen production. When studying the cutting technology influence on specimen surface quality some flaws have been reviled in the form of cleavage in addition to cracks and other flaws, which are re-sponsible for test specimen surface quality, and, therefore, the CFRP characteristics. Test specimen flaws have been described with their quantitative estimation. Flaws quantitative estimation technique has been worked out by means of computerized quantitative optical metallographic analysis method.

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11.
dx.doi.org/ 10.18577/2307-6046-2014-0-10-11-11
УДК 620.179:678.8
Shuldeshov Е.М., Lepeshkin V.V., Romanov A.M.
METHOD OF NON-DESTRUCTIVE TESTING OF COMPLEX DIELECTRIC PERMITTIVITY OF INPUT POORLY FILLED LAYERS OF GRADIENT RADAR-ABSORBING POLYMERIC COMPOSITE MATERIALS

Dielectric characteristics of input poorly filled layers of gradient radar-absorbing polymeric composite materials were investigated by nondestructive control method. Methods of measurement of complex dielectric permittivity of samples are described. A stand for carrying out non-destructive testing of complex dielectric permittivity of input layers of radar-absorbing gradient structures is described. Advantages of this method are described, cases of the most reasonable application are considered.

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12.
dx.doi.org/ 10.18577/2307-6046-2014-0-10-12-12
УДК 620.194.22:669.295
Zakharova L.V.
INFLUENCE OF AIR OXYGEN AND THICKNESS OF SALT DEPOSITS ON CORROSION CRACKING OF TITANIUM ALLOYS AT HIGH TEMPERATURES IN CONTACT WITH NaCl

Titanium alloys find a wide application in aircraft equipment operating in all-climatic conditions, where a sea salt deposition on their surface causing hot salt corrosion at raised temperatures (≥250°C) is possible. An influence of salt deposits thickness on corrosion cracking of titanium alloys under conditions of raised temperatures and stretching or alternating loads and also a role of air oxygen in the course of hot salt cor-rosion was studied in this work. As a result of the conducted researches it was established that oxygen of air takes an active part in the process of hot salt corrosion and the main component of hard products of corrosion is TiO2. It was shown that thickness of salt deposits has an impact on cracking resistance of titanium alloys at high temperatures under loads and salt layers of ~50 microns of thickness have the highest aggression.

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