scholarly journals Creation of Polymer Coatings for Improving of Protective Properties of Surfaces

2021 ◽  
Vol 12 (2) ◽  
pp. 2698-2702
Author(s):  
A.A. Orekhov, Et. al.
Keyword(s):  
Mathematical Modeling ◽  
Mechanical Properties ◽  
Polymer Coatings ◽  
Strength Properties ◽  
Structural Elements ◽  
Properties Of Coatings ◽  
Mechanical Loads ◽  
Protective Properties ◽  
Modeling Methods ◽  
Metal Plates

In this paper, the preparation of polymer coatings on the surface of metal structural elements is considered to improve their physical, mechanical and strength properties. It is shown that the behavior of substrate samples under mechanical loads can be estimated using mathematical modeling methods. The properties of coatings and the mechanical properties of coated and uncoated metal plates have been evaluated. Methods for constructing mathematical models of metal plates of various structures are proposed.

MODERN TECHNOLOGIES FOR THE RESTORATION OF MACHINE PARTS

2021 ◽  
Vol 1 (142) ◽  
pp. 154-161
Author(s):  
Alexander Kostyukov ◽  
Keyword(s):  
Mechanical Properties ◽  
Adhesive Strength ◽  
Physical And Mechanical Properties ◽  
Main Property ◽  
Polymer Coatings ◽  
Polymer Materials ◽  
Research Purpose ◽  
Properties Of Coatings ◽  
Machine Parts ◽  
Metal Polymer

At repair enterprises, various metal-polymer materials are used to restore the interfaces. Metal-polymer materials can be filled with the following components: steel, bronze, aluminum, titanium. The main advantages of metal polymers are their resistance to negative environmental influences, mechanical friction and high temperatures. (Research purpose) The research purpose is in analyzing the possibilities of metal-polymer materials for effective use in the restoration of machine parts and to give suggestions for improving their physical and mechanical properties during the restoration work. (Materials and methods) Authors studied metal-polymer materials of well-known companies: "Belzona" (USA), "Durmetal" (Switzerland), "Diamant" (Germany), "Loctite" (USA), Chester Molecular (Poland). The article presents the data on their use in the restoration of various parts. The metal polymer materials of foreign companies are characterized by stable quality and high physical and technical characteristics; domestic materials are still inferior to imported ones due to the low quality of the incoming components. (Results and discussion) The main property of coatings is the adhesive strength, which largely determines the resource of the restored part. The main factors that affect the adhesive strength are described in the article. It is possible to significantly increase the adhesive strength of the coatings due to the preliminary electric spark treatment of the worn part. The article presents data on the effectiveness of electric spark coatings as an independent technological process in the restoration of the part. The use of a combined technology of electric spark processing with subsequent application of metal-polymer materials provides undeniable advantages in the restoration of parts. (Conclusions) To improve the physical and mechanical properties of coatings, it is advisable to combine the technology of electric spark processing with the use of metal-polymer coatings. This will expand the possibilities of using part recovery technologies.

MODERN TECHNOLOGIES FOR THE RESTORATION OF MACHINE PARTS

2021 ◽  
Vol 1 (142) ◽  
pp. 154-161
Author(s):  
Alexander Yu. Kostyukov ◽  
Keyword(s):  
Mechanical Properties ◽  
Adhesive Strength ◽  
Physical And Mechanical Properties ◽  
Main Property ◽  
Polymer Coatings ◽  
Polymer Materials ◽  
Research Purpose ◽  
Properties Of Coatings ◽  
Machine Parts ◽  
Metal Polymer

At repair enterprises, various metal-polymer materials are used to restore the interfaces. Metal-polymer materials can be filled with the following components: steel, bronze, aluminum, titanium. The main advantages of metal polymers are their resistance to negative environmental influences, mechanical friction and high temperatures. (Research purpose) The research purpose is in analyzing the possibilities of metal-polymer materials for effective use in the restoration of machine parts and to give suggestions for improving their physical and mechanical properties during the restoration work. (Materials and methods) Authors studied metal-polymer materials of well-known companies: "Belzona" (USA), "Durmetal" (Switzerland), "Diamant" (Germany), "Loctite" (USA), Chester Molecular (Poland). The article presents the data on their use in the restoration of various parts. The metal polymer materials of foreign companies are characterized by stable quality and high physical and technical characteristics; domestic materials are still inferior to imported ones due to the low quality of the incoming components. (Results and discussion) The main property of coatings is the adhesive strength, which largely determines the resource of the restored part. The main factors that affect the adhesive strength are described in the article. It is possible to significantly increase the adhesive strength of the coatings due to the preliminary electric spark treatment of the worn part. The article presents data on the effectiveness of electric spark coatings as an independent technological process in the restoration of the part. The use of a combined technology of electric spark processing with subsequent application of metal-polymer materials provides undeniable advantages in the restoration of parts. (Conclusions) To improve the physical and mechanical properties of coatings, it is advisable to combine the technology of electric spark processing with the use of metal-polymer coatings. This will expand the possibilities of using part recovery technologies.

Mechanical Properties of Wood and Timber Bridge Evaluation

2014 ◽  
Vol 587-589 ◽  
pp. 1381-1385
Author(s):  
Ling Ling Yu ◽  
Jie Jun Wang ◽  
Te Huang
Keyword(s):  
Mechanical Properties ◽  
Structural Integrity ◽  
Strength Properties ◽  
Structural Elements ◽  
Bridge Evaluation ◽  
Bridge Structures ◽  
And Performance ◽  
Inspection Techniques ◽  
Non Destructive ◽  
Timber Bridges

Wood possesses material properties that may be significantly different from other materials normally encountered in structural design. It is necessary for the engineer to have a general understanding of the properties and characteristics that affect the strength and performance of wood in bridge applications. This paper discusses the mechanical properties of wood, including elastics properties and strength properties. Timber bridge are often exposed to harsh environment conditions. Over time, this exposure can lead to deterioration. In turn, this deterioration may lead to a loss of structural integrity that is detrimental to the structure and its users. Timber structural elements are susceptible to degradation due to environmental and loading conditions. A variety of inspection techniques can be employed to locate damage and decay in timber members in order to maintain structural performance. Methods of non-destructive techniques for timber bridges are getting more and more important. This paper presents several non-destructive methods to timber bridge structures.

scholarly journals Modelling of Mechanical Properties of Metal Plates with Polymer Coatings

2021 ◽  
Vol 12 (5) ◽  
pp. 530-534
Author(s):  
M.O. Kaptakov
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Finite Element ◽  
Residual Stresses ◽  
Critical Load ◽  
Critical Loads ◽  
Software Package ◽  
Polymer Coatings ◽  
Metal Plates ◽  
Refined Estimate

In this work, we compare the experimental and calculated results obtained in the numerical simulation of uniaxial tension of specimens of metal plates with a thickness of 0.7 mm. For modeling, the Digimat-FE (MSC) system was used, which in numerical calculations uses the finite element solver of the Marc software package (MSC). It is shown that for samples without coatings, the found theoretical values of the critical load quite well correspond to the points on the experimental diagrams at which the dependence of the load and displacement ceases to be linear. For specimens with coatings, the critical loads are significantly lower, and for their description it is necessary to obtain a refined estimate taking into account the effect of residual stresses.

scholarly journals Mechanical Properties of Glass Fiber Composites Reinforced by Textile Fabric

2015 ◽  
Vol 1 ◽  
pp. 133
Author(s):  
Arturs Macanovskis ◽  
Andrejs Krasnikovs ◽  
Olga Kononova ◽  
Galina Harjkova ◽  
Vladislav Yevstignejevs
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Polymer Matrix ◽  
Strength Properties ◽  
Machine Building ◽  
Structural Elements ◽  
Structural Element ◽  
Glass Fiber Composites ◽  
Material Volume ◽  
External Loads

<p class="R-AbstractKeywords"><span lang="EN-US">Interest to structural application of textile reinforced polymer matrix composite materials (CM) is growing during last years. In different branches of machine building, aerospace, automotive and others industries we can find structural elements preferably be produced using such reinforcement. At the same time, such materials are exhibiting elastic and strength properties scatter. In the framework of the present investigation, we observe yarn penetrated by a resin in a composite as a reinforcing “macro” fiber. Such “macro” fiber mechanical properties were measured experimentally, for this purpose was produced and was tested by tension until fracture fiber samples, having different length. Then was elaborated and was realized structural strength probabilistic model. In the textile geometry, was picked out repeating structural element – polymer matrix volume with two curved “macro” fiber’s chunks inside it. Complete composite material volume is possible to represent as a set of repeating structural elements. External loads application leads to disperse structural elements failure. Neighboring to ruptured elements are overloaded leading to higher probability to fail for them. Using FEM was modeled stress state in “macro” fibers inside CM. Then, was numerically obtained stress distribution in composite material, having different number of broken loops. Probabilities of different numbers of failed elements were calculated.  Strength probability function, based on Weibull approach was obtained. CM samples were tested under tension and obtained results were compared with numerical modeling as well as were analyzed.</span></p>

Evaluation of the functional tension of foreign medical student’s organisms in adapting to educational activities

2020 ◽  
pp. 755-755
Author(s):  
N. K. Smagulov ◽  
A. A. Adilbekova ◽  
N. V. Gitenis
Keyword(s):  
Mathematical Modeling ◽  
Foreign Students ◽  
Educational Process ◽  
Educational Activities ◽  
Modeling Methods ◽  
Functional Stress

The use of mathematical modeling methods allowed us to develop criteria for functional stress for assessing and predicting the level of functional stress of foreign students in the process of adaptation to the educational process.

Effect of nickel on formation of transition layer during liquid-phase aluminizing of titanium

2020 ◽  
pp. 313-317
Author(s):  
A.I. Kovtunov ◽  
Yu.Yu. Khokhlov ◽  
S.V. Myamin
Keyword(s):  
Mechanical Properties ◽  
Liquid Phase ◽  
Intermetallic Layer ◽  
Reaction Diffusion ◽  
Strength Properties ◽  
Effect Of Temperature ◽  
Nickel Concentration ◽  
Aluminum Melt ◽  
Titanium Aluminum ◽  
Titanium Foam

Titanium—aluminum, titanium—foam aluminum composites and bimetals obtained by liquid-phase methods, are increasingly used in industry. At the liquid-phase methods as result of the reaction diffusion of titanium and aluminum is formed transitional intermetallic layer at the phase boundary of the composite, which reduces the mechanical properties of titanium and composite. To reduce the growth rate of the intermetallic layer between the layers of the composite and increase its mechanical properties, it is proposed to alloy aluminum melt with nickel. The studies of the interaction of titanium and molten aluminum alloyed with nickel made it possible to establish the effect of temperature and aluminizing time on the thickness, chemical and phase compositions of the transition intermetallic layer. The tests showed the effect of the temperature of the aluminum melt, the nickel concentration on the strength properties of titanium—aluminum bimetal.

scholarly journals Comparative Analysis of Shear Strength Parallel to Fiber of Different Local Bamboo Species in the Philippines

2021 ◽  
Vol 13 (15) ◽  
pp. 8164
Author(s):  
Brian E. Bautista ◽  
Lessandro E. O. Garciano ◽  
Luis F. Lopez
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Comparative Analysis ◽  
Strength Properties ◽  
The Philippines ◽  
Bamboo Species ◽  
Test Protocol ◽  
Future Design ◽  
Average Shear Strength ◽  
Bambusa Vulgaris

There are limited published studies related to the mechanical properties of bamboo species in the Philippines. In this study, the shear strength properties of some economically viable bamboo species in the Philippines were properly characterized based on 220 shear test results. The rationales of selecting this mechanical property are the following: (1) Shear strength, parallel to the fiber, has the highest variability among the mechanical properties; and (2) Shear is one of the governing forces on joint connections, and such connections are the points of failure on bamboo structures when subjected to extreme loading conditions. ISO 22157-1 (2017) test protocol for shear was used for all tests. The results showed that Bambusa blumeana has the highest average shear strength, followed by Gigantochloa apus, Dendrocalamus asper, Bambusa philippinensis, and Bambusa vulgaris. However, comparative analysis, using One-way ANOVA, showed that shear strength values among these bamboo species have significant differences statistically. A linear regression model is also established to estimate the shear strength of bamboo from the physical properties. Characteristic shear strength is also determined using ISO 12122-1 (2014) for future design reference.

scholarly journals The Extrusion and SPS of Zirconium–Copper Powders and Studies of Selected Mechanical Properties

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3560
Author(s):  
Tomasz Skrzekut ◽  
Grzegorz Boczkal ◽  
Adam Zwoliński ◽  
Piotr Noga ◽  
Lucyna Jaworska ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Intermetallic Compounds ◽  
Room Temperature ◽  
Intermetallic Phase ◽  
Extrusion Process ◽  
Strength Properties ◽  
Plasma Sintering ◽  
Copper Powders ◽  
Spark Plasma ◽  
Zirconium Copper

Zr-2.5Cu and Zr-10Cu powder mixtures were consolidated in the extrusion process and using the spark plasma sintering technique. In these studies, material tests were carried out in the fields of phase composition, microstructure, hardness and tensile strength for Zr-Cu materials at room temperature (RT) and 400 °C. Fractography analysis of materials at room temperature and 400 °C was carried out. The research took into account the anisotropy of the materials obtained in the extrusion process. For the nonequilibrium SPS process, ZrCu2 and Cu10Zr7 intermetallic compounds formed in the material at sintering temperature. Extruded materials were composed mainly of α-Zr and ZrCu2. The presence of intermetallic compounds affected the reduction in the strength properties of the tested materials. The highest strength value of 205 MPa was obtained for the extruded Zr-2.5Cu, for which the samples were cut in the direction of extrusion. For materials with 10 wt.% copper, more participation of the intermetallic phase was formed, which lowered the mechanical properties of the obtained materials. In addition to brittle intermetallic phases, the materials were characterized by residual porosity, which also reduced the strength properties.

Film thickness limits of a buckling-based method to determine mechanical properties of polymer coatings

2021 ◽  
Vol 582 ◽  
pp. 227-235
Author(s):  
Elina Niinivaara ◽  
Johanna Desmaisons ◽  
Alain Dufresne ◽  
Julien Bras ◽  
Emily D. Cranston
Keyword(s):  
Mechanical Properties ◽  
Film Thickness ◽  
Polymer Coatings
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