Cold Spray Repairing Corrosively Damaged Areas on Aircraft Constructions

2017 ◽  
Vol 265 ◽  
pp. 325-330
Author(s):  
V.S. Shikalov ◽  
N.S. Ryashin ◽  
A.V. Lapaev
Keyword(s):  
Aluminum Alloy ◽  
Cyclic Loading ◽  
Cold Spray ◽  
Corrosion Damage ◽  
Cold Spraying ◽  
Mechanical Tests ◽  
Strength Characteristics ◽  
Structural Elements ◽  
Preliminary Results ◽  
Deformation Diagrams

The paper studies the possibility of applying the coatings produced by cold spraying, for the protection and repair of aircraft structural elements of aluminum alloy against corrosion damage during service of aircrafts. Mechanical tests were carried out on samples, made of aircraft alloy 1163RDTV, and repaired by cold spraying after corrosion damage. It is shown that the coating production via cold spraying on corrosively damaged areas can restore the strength characteristics of the sample in the elastic region of deformation diagrams. The preliminary results of the influence of cyclic loading on repaired by cold spraying samples were also obtained. It is shown that the characteristics of durability increased by factor 1.67 in comparisons with the sample that was not repaired after corrosion damage.

scholarly journals Computer Modeling Deformation of Porous Elastoplastic Materials and Identification their Characteristics Using the Principle of Three-dimensional Similarity

2021 ◽  
Vol 14 (6) ◽  
pp. 746-755
Author(s):  
Valentin G. Bazhenov ◽  
◽  
Maxim N. Zhestkov
Keyword(s):  
Aluminum Alloy ◽  
Strain State ◽  
Large Deformations ◽  
Three Dimensional ◽  
Structural Elements ◽  
Compression Tests ◽  
Similarity Principle ◽  
Elastoplastic Materials ◽  
Deformation Diagrams ◽  
3D Similarity

It is proposed to numerically model large deformations of porous specimens, using the 3D- similarity principle in structural elements, which makes it possible to account for the inhomogeneity of the stress-strain state due to the presence of pores and allows one to vary the number of representa- tive volumes without changing porosity values and dimensions of the specimens. A methodology for determining true deformation diagrams of materials, using the results of compression tests, has been de- veloped. The efficiency of using the 3D-similarity principle is demonstrated by comparing the numerical and experimental results for the example analyzing compression of porous specimens of an aluminum alloy with free lateral surfaces and fixed in a rigid cartridge

Investigation of the Splat Deposition Behavior onto a Composite Coating in Cold Spray

2018 ◽  
Vol 941 ◽  
pp. 1639-1644
Author(s):  
Xin Chu ◽  
Phuong Vo ◽  
Stephen Yue
Keyword(s):  
Electron Microscope ◽  
Composite Coating ◽  
Cold Spray ◽  
Spray Deposition ◽  
Cold Spraying ◽  
Single Component ◽  
Optical Profilometry ◽  
Deposition Behavior ◽  
Polished Substrate ◽  
Scanning Electron

The splat test is usually generated by low feed rate cold spraying of particles onto an as-polished substrate and it can be considered as a monolayer coating deposition. In this study, in order to investigate cold spray deposition mechanisms, Fe splats were sprayed onto the cold-sprayed single component 316L, Fe, and a composite 90Fe coatings. Results showed that although there is only 3.6 vol.% of 316L in the composite 90Fe coating, Fe splats exhibit a much better deposition behavior onto the 90Fe as compared with the single component Fe coating. To explain this observation, Fe splat samples were characterized using the scanning electron microscope (SEM), optical profilometry, splat adhesion tests, and splat nanoindentation. Finally, a preliminary explanation towards the Fe splat deposition behavior onto the composite coating was drawn.

Using of Untreated Carbon Nanotubes in Cement Compositions

2016 ◽  
Vol 865 ◽  
pp. 6-11 ◽  
Author(s):  
Kateryna Pushkarova ◽  
Maryna Sukhanevych ◽  
Artur Martsikh
Keyword(s):  
Carbon Nanotubes ◽  
Cement Paste ◽  
Cementitious Materials ◽  
Positive Influence ◽  
Mechanical Tests ◽  
Strength Characteristics ◽  
Concrete Durability ◽  
Cement Mortars ◽  
Optimum Decision ◽  
Cement System

One of the most important problem of concrete durability is increasing of waterproofing. Researches are devoted studying of cement mortars modified by carbon nanotubes, dispersed in plasticizers solutions. Were investigated physico-mechanical properties of cement paste, cement-sand mortar into which structure entered untreated carbon nanotubes (production of plant TM "Spetsmash" Kyiv, Ukraine) in various quantity. Were used as plasticizers in cement compositions additives substances of the various chemical nature – naphtaleneformaldehyde, melamineformaldehyde and polycarboxylate. Quantity of untreated nanotubes varied from 0,5%; 1,0% and to 1,5%. Concentration of additives was accepted taking into account recommendations of producers and made about 1% from the weight of cement. Were studied some technological processes of introduction untreated carbon nanotubes in cement system and is shown that the way of introduction of nanomodifiers has essential impact on strength characteristics of cementitious materials. Optimum decision introduction of untreated carbon nanotubes is using its in dispersion plasticizer of the working concentration prepared in an ultrasonic dispergator is established. Results of physico-mechanical tests of cement paste and cement-sand mortar showed positive influence at introduction of untreated carbon nanotubes as cement modifiers on strength characteristics of samples. Resalts is shown that the nanomodifier, used quantity about 1% in solution of lignosulfonate with polycarboxylate and melamineformaldehyde plasticizer has great impact on strength characteristics.

Microstructure, microhardness and tribological behavior of Al2O3 reinforced A380 aluminum alloy composite coatings prepared by cold spray technique

2018 ◽  
Vol 350 ◽  
pp. 391-400 ◽  
Author(s):  
Xiang Qiu ◽  
Naeem ul Haq Tariq ◽  
Ji-qiang Wang ◽  
Jun-rong Tang ◽  
Lawrence Gyansah ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Cold Spray ◽  
Tribological Behavior ◽  
Composite Coatings ◽  
Alloy Composite ◽  
Spray Technique

Study on Corrosion Damage Rule for Two Type of Aluminum Alloy

2014 ◽  
Vol 599-601 ◽  
pp. 111-113
Author(s):  
Dan Feng Zhang ◽  
Xiao Ming Tan ◽  
Dan Gui Zhang ◽  
Fang Zhang ◽  
Wei Zhang
Keyword(s):  
Aluminum Alloy ◽  
Statistical Analysis ◽  
Marine Environment ◽  
Corrosion Test ◽  
Corrosion Damage ◽  
Aircraft Structure ◽  
Accelerated Corrosion ◽  
Damage Repair ◽  
Accelerated Corrosion Test ◽  
Damage Rule

Corrosion exists everywhere. It’s very widespread that the aluminum alloy aircraft structure suffers the corrosion damage under the marine environment particularly. The equivalent accelerated corrosion test of the new aluminum alloy 2B06 and 7B04 was carried out.Corrosion damage was inspected and measured through microscope. The rule of the corrosion damage can be obtained by statistical analysis. And which can supply the reference basis for the corrosion damage repair and evaluating the calendar life.

Anticorrosive and hydrophobic properties of carbonic acid films on surface of D16 aluminum alloy

2021 ◽  
pp. 23-29
Author(s):  
A. M. Semiletov ◽  
◽  
A. A. Kudelina ◽  
Yu. I. Kuznetsov ◽  
◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Carbonic Acid ◽  
Corrosion Damage ◽  
Textured Surface ◽  
Hydrophobic Properties ◽  
Polarization Measurements ◽  
Protective Films ◽  
Surface Irregularities ◽  
Average Size ◽  
Optimal Type

The production possibility of protective films of higher carboxylic (lauric, stearic (SA), oleic and linolenic) acids on a laser-textured surface of an aluminum alloy D16 is discussed. It is shown that such a modification leads to superhydrophobization (SHP) of the alloy surface. The most optimal type of laser processing has been determined: laser power is 12 W and the pass speed is 1000 mm / s. Profilometric measurements determined the average size of surface irregularities which is 6,47 microns. The degradation results of the SHP state in an aqueous solution of 0,05 M NaCl indicate greater stability of films formed from SA solutions. The protective ability of the coatings was evaluated by polarization measurements and corrosion tests in a salt chamber. It was found that films formed from an SA solution had the best anticorrosive properties. According to polarization measurements, an increase in ΔEpt = 220 mV, and the time of the first corrosion damage appears τcor = 384 h.

Investigation of Mechanical Behavior of Layered Metal-Rubber Composites Based on Steel and Aluminum Alloy

2021 ◽  
Vol 902 ◽  
pp. 87-94
Author(s):  
Svetlana Kuteneva ◽  
Sergei Gladkovsky ◽  
Pavel Nedzvetsky ◽  
Valeriya Veselova
Keyword(s):  
Aluminum Alloy ◽  
Mechanical Behavior ◽  
Mechanical Tests ◽  
Advanced Materials ◽  
Layered Composites ◽  
Rubber Composites ◽  
Operational Conditions ◽  
Lap Shear ◽  
Intermediate Layers ◽  
Metal Rubber

Metal-polymer composites are advanced materials for the aerospace, automotive and railway industry where details and elements of construction are affected by impact, cyclic and vibration loads. In the present work layered composites based on steel, aluminum alloy and rubber as intermediate layers were obtained by cold and hot bonding using adhesives. Adhesive lap-shear bond strength of layered composites fabricated by various techniques was determined using tensile shear test. To evaluate the mechanical behavior of layered metal-rubber composites under simulated operational conditions static, dynamic and cyclic, three points bending tests were carried out. The results of mechanical tests of these composites indicated that hot bonding is the most preferred fabrication method for the formation of increased mechanical characteristics.

Statistical Tensile Strength Characteristics of Aluminum Alloy Pipe and Steel Pipe Friction Welded Joints

2000 ◽  
Vol 331-337 ◽  
pp. 1731-1736
Author(s):  
Gosaku Kawai ◽  
Koichi Ogawa ◽  
Ryoji Tsujino ◽  
Hiroshi Yamaguchi ◽  
Hiroshi Tokisue
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Welded Joints ◽  
Strength Characteristics ◽  
Steel Pipe
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