Steel Clamp Research Articles

Pathway to Multi-Response Characterization of the Improved Elliptical Vessel Solar Receiver for Efficiencies Maximization

Studies on the pathway to multi-response characterization of the improved elliptical vessel solar receiver for environmental sustainability has been studied. The materials were sourced based on categories of components element: support mechanisms made of mild steel plates, bolts, nuts, clamps, and water as heat transfer fluid. The reflector was made of aluminum foil tape while the vessel has a glass cover fitted with bolts and nuts, the receiver is made of copper pipe, aluminum pipe, galvanized iron pipes, and stainless steel pipes. They are fitted into the vessel with chlorinated polyvinyl chloride 3⁄4 pipes, and journal-bearing mechanisms. Furthermore, glass cover attachment reduces radiative heat loss coefficient by eliminating wind influence and increases heat flux inside the vessel thereby improving heat transfer, hence improving the overall system's efficiency. The pathway to multi-response characterization showed that the average experimental thermal efficiency rose from 9.83% to 12.55% and from 4.42% to 7.03% for Polyurethane coated Copper and Aluminum respectively. It reduced from 9.83% to 8.53% and from 8.10% to 6.50% respectively for Polyurethane coated Galvanized Iron and Aluminum. This depicts the gleam appearance of Polyurethane coating on Galvanized Iron and stainless steel thus reducing their heat absorption coefficient and in turn reducing their efficiency.

Design modification of elliptical vessel solar receiver by response surface methodology

Design modification of elliptical vessel solar receiver system by response surface methodology has been carried out. The materials used in this study were locally sourced from Kenyeta Market Enugu, Onitsha Bridge Head Market, and Idumota Market Lagos. These materials were sourced based on categories of components element: support mechanisms made of mild steel plates, bolts, nuts, clamps, and water as heat transfer fluid. The reflector is made of aluminum foil tape while the vessel has a glass cover fitted with bolts and nuts, the receiver is made of copper pipe, aluminum pipe, galvanized iron pipes, and stainless steel pipes. The pipes were fitted into the vessel with chlorinated polyvinyl chloride 3⁄4 joint pipes, and journal-bearing mechanisms. Other features include the tracking system made of light dependent resistance sensors, a direct current motor, a pulley, a belt, an Arduino controller, and a thermal energy storage tank. The lagging material was an expanded Polyethylene sheet. Experimental data were measured with thermocouples, a digital panel, a Uni-T digital anemometer (UT363), and a digital solar power meter (SM206-SOLAR). Matrix Experimental design was used to develop an experimental model for the system. The developed system was tested to investigate the effect of various heat collectors with and without coating on its performance. It was established from the response optimization that the intercept factor was improved by 32.2%. Similarly, the theoretical efficiency was improved by 8.19% while the experimental thermal efficiency was improved by 6.99%.

Investigation of a Cathodic Protection Configuration for the Steel Casing Pipes in Reinforced Concrete Bridge in the Niger Delta

This paper details the Design of a Cathodic Protection System on the steel casing pipes of the 60m reinforced concrete bridge project in the Niger Delta, Nigeria. Galvanic anode cathodic protection system was provided for the submerged steel support piles on the newly reinforced concrete bridge to ensure adequate corrosion protection of the structures. A total of fifty-six (56) Aluminum Anodes (32 kg) were used. Two of the Aluminum anodes were installed on each of the twenty-eight (28) steel casing piles. The anode installation was achieved by means of clamping at the predetermined water depth of 37.2 m with purpose made carbon steel clamps. The bonding of the anode to the pile structure to make electrical contact was achieved through welding of the pre-installed anode steel core extension bar against the steel pile at the water splash zone area of the river. A pre- and post-installation test and survey activities were conducted on each of the steel piles to ascertain the integrity of the installation and degree of corrosion protection of the steel casing piles. The field test and measurement results indicated mean values of open circuit potential of 0.600 Volts and polarized corrosion potential of 0.850 Volts. The recorded corrosion potential for the installed cathodic protection system confirmed adequate corrosion protection for ten (10) years from anode life for the steel casing supports of the 60 m reinforced concrete bridge.

Joints with bamboo slats for shear wall frames

Bamboo is a rapid-growing plant that is a sustainable candidate to replace highly contaminating materials in housing projects. Bamboo slats are a promising alternative to using bamboo culms, as they have a higher bulk density, can be easily extracted from defective culms, and have a geometry that can be more easily controlled to standard dimensions. This study proposes joints for bamboo slats to be used in the frameworks of shear walls. To this end, three connections for Guadua bamboo slats were proposed and tested under monotonic loading to determine their moment-rotation behavior. A first joint to connect two slats was composed of two platens that compressed the slats along their wall thickness by tightening bolts. Monotonic tests of this joint showed its high ductility (range 9.5 – 38.8) and results dependent on bolt grade since the rotational stiffness and the ductility for grade-2 bolts were about 1.3 and 2.0 times significantly different than those for the specimens with grade-5. Two other proposed joints for multiple-slat members were composed of bamboo pins, platens, bolts, wood wedges, stainless steel sheets, and self-tapping screws. Significant differences were not found in the ductility and rotational stiffness of these two joints, which were in the range of 1.7–4.2, and 4954–8984 N-m/rad, respectively. However, the maximum moment (range 1172–1362 N-m) for the joint with a cedar wedge was around 1.5 times significantly higher than that (range 782–942 N-m) with a steel clamp. The multiple-slat joints displayed a relatively high ductility, while other mechanical parameters were similar to those reported in the literature for joints connecting members of substantially higher cross sections. The use of moment-resistant joints may improve the mechanical performance of shear-wall frameworks under seismic loading, enhancing the versatility of the system and providing alternatives to extend the application of bamboo for housing.

Experimental study and failure mechanism analysis at the meso-scale of the fatigue performance of a CFRP tendon novel composite anchorage

This paper investigates the fatigue performance of CFRP tendon novel composite anchorages. The fatigue mode of the novel composite anchorage was analysed. Furthermore, based on the meso-morphology of the contact surface between tendons and epoxy resin, the fatigue mechanism of composite anchorage was explored. Finally, the effects of fatigue cyclic load on the slippage of tendons at both free end and loaded ends and clamps, the barrel strain and the stiffness of CFRP tendons were investigated. Results revealed that the novel composite anchorage can subject 2 million fatigue cycles load under 0.45 fu fatigue maximum stress and 200 MPa stress range. The failure modes of FS-2, FS-3 and FTD-1 specimens with fatigue failure were the damage of the contact surface between the tendons and the epoxy resin, which leads to the tendons slip out from the epoxy resin. Furthermore, the fatigue performance of the three-tendon specimens with dispersed anchoring was worse than that of the anchorage with parallel anchoring. Steel barrels and clamps can work effectively in all specimens, but the tendons stiffness increases slightly initially and then decreases rapidly. In summary, the novel composite anchorage has good fatigue performance and the potential for practical application.

Evaluation of the effect of different rubber dam clamps on the mandibular first molar with Finite element analysis

The aim of this study was to evaluate the stress induced by clamps made of different materials on mandibular first molar teeth using finite element analysis. The tooth model to be used in the study was created using micro-CT scanner and the rubber dam clamp model was created in three dimensions (3D) using Solidworks and applied to a finite element tooth model of an intact mandibular first molar. The size of the clamp opening and the force to be applied were calculated according to the buccolingual distances of the tooth. The contact areas of the clamps on the tooth were determined and subjected to force. The stress distribution patterns and maximum von Mises stresses were calculated and compared against these forces. The most stress against these forces occurred in the enamel tissue on the distal side where the clamp was in contact with the tooth. The stress value in the stainless steel clamp (191.63 MPa) was approximately 85% higher than the clamp made of polyethylene ketone (103.85 MPa). The stress in the dentin and pulp tissue of the tooth was negligible. Clinicians should examine the enamel tissue below the equatorial line of the tooth in detail before clamp application. The forces exerted by stainless steel clamps can cause damage to the enamel tissue of the tooth or progression of an existing enamel crack.

Determination of the load-bearing capacity increase coefficient of a steel-concrete cylindrical load-bearing element

Abstract. Problem. Steel-concrete cylindrical load-bearing elements are rational for reducing material intensity of individual elements and systems as a whole in construction. External sheet reinforcement of cylindrical elements, which is in the form of clamp, simultaneously performs the power, protective and technological functions. The clamps in steel-concrete cylindrical load-bearing elements restrain the movement of concrete in the transverse direction and lead to the gain in concrete strength among other. The concrete in the middle of the shell-clamp, in turn, increases its stability. Goal. The purpose of these theoretical researches is to determine the load-bearing capacity increase coefficient of a steel-concrete cylindrical load-bearing element based on the fundamental theories and criteria of material resistance and the theory of elasticity. Methodology. Research was performed using the analysis of scientific literature, systematization and unification of various theoretical methods and criteria for the strength of materials and the stress-strain behavior of individual elements and the structure as a whole. Results. Theoretical calculations to determine the load-bearing capacity increase coefficient of a steel-concrete cylindrical element made by enclosing a concrete core in a steel clamp are presented on the basis of the combined fundamental theories and criteria of material resistance along with the theory of elasticity. Originality. The scientific novelty of the work consists in the fact that specific fundamental theoretical methods and criteria for assessing strength and determining the stress-strain behavior of structural elements were comprehensively analyzed and systematized, taking into consideration current regulatory requirements. Practical value. The presented results of the work are significantly different from most of the presented methods in the direction of calculating the stress-strain behavior and determining the load-bearing capacity of steel-concrete cylindrical load-bearing elements. Firstly, this would enable scientists to look at the problem of calculating such load-bearing elements from a new angle in further research, and secondly, it would accelerate the possibility of rational using of steel-concrete cylindrical load-bearing elements in all directions of construction.

Development of stress-strain models for concrete columns externally strengthened with steel clamps

A robust and sustainable solution is required to tackle the ever-growing generation of construction waste worldwide. It has been known that construction waste yields concrete with substandard mechanical properties when used as a replacement for natural aggregates. With attributes like easy application and low cost, this study investigated the performance of low cost and easily available steel clamps to improve the compressive stress–strain properties of concrete fabricated with recycled concrete and brick aggregates. Results demonstrate that steel clamps effectively improved the stress–strain behavior of recycled aggregate concrete, and this improvement was more pronounced in concrete with a higher percentage of recycled aggregates. Steel clamps confinement increased the compressive strength by up to 242% and 252% for recycled concrete and recycled brick aggregate concrete, respectively, whereas the corresponding strain was increased by up to 448% and 414%, respectively. The stress–strain response of steel clamp-confined RAC was idealized into two branches: the first branch was assumed to be parabolic in shape till the peak strength, and a linear degrading branch was assumed for the post-peak region. Separate equations were proposed using regression analysis for peak strength, strain, initial modulus, and post-peak degradation modulus. The complete stress–strain curves of steel clamp-confined RAC were generated by utilizing existing equations. The proposed regression equations were combined with existing equations to generate complete stress–strain curves of steel clamp-confined RAC. In general, good agreement between experimental and predicted stress–strain curves was obtained.

Study on reinforced concrete elements of buildings and structures with cracks, reinforced with composite polymer materials

With the rapid development of modern construction practice around the world, serious problems arise in the application and subsequent operation of reinforced concrete structures. Today, the problem of reconstruction and restoration of buildings and structures requires an urgent solution. The deterioration of the environmental situation threatens the reliability of buildings and structures, a sharp deterioration in their condition is observed in almost all countries and climatic zones. In our case, the trend towards wear is developing due to the imperfection of regulatory documents and the need for proper maintenance of objects. The development of the construction industry and the use of innovative composite polymer materials in construction and the strengthening of existing buildings and structures with modern methods are relevant. Often very rare, expensive, historically significant structures require reliable operation, and their dismantling or replacement is more expensive than repair, or even impossible. Reinforcement of building structures using composite polymer materials (CPM) is by far the most “cautious” measure for their restoration and improvement of performance. In our research, the main attention is paid to the technology of external reinforcement of reinforced concrete beams using CFRP to increase their load-bearing capacity at shear. To reduce material consumption when strengthening the structure, it is more efficient to use CFRP in the form of strips, however, this practice has not been practically studied. Previous researchers have concentrated their attention mainly on external reinforcement, generally ignoring the effect of internal reinforcement. However, it is known that internal and external reinforcement complement each other and the destruction during shearing of reinforced concrete elements is mainly influenced by such factors as steel clamps, longitudinal reinforcement and the ratio of the shear span to the working height of the section. Therefore, in our studies, special attention was paid to considering the influence of these factors on the overall bearing capacity of beams. In addition, the work studied the ability to transfer shear stresses through cracks in reinforced concrete beams reinforced with external reinforcement from CFRP compared to the same unreinforced ones.

The Influence of Adiabatic Heat and Combined Blast Load and Fire Loading on the Response of Mild Steel Plates

This paper study the influence of adiabatic heat and fire loading on the behaviour of unstiffened mild steel plates subjected to close-in blast loads using finite element (FE) analysis. A quarter-symmetry 3D FE model consists of the steel plate, clamps and bolts was developed using Abaqus/CAE. Classical plasticity model was used as the material model in the steel plate and bolts. The clamps were assumed as an elastic material. Temperature-material properties relationship according to Eurocode 3 and Masui model was assigned to the steel plate. Conwep function was used to simulate the blast loads. The influence of strain rates was considered in the steel plate using the Cowper-Symonds equation. The FE model of the unstiffened plates was verified and validated against experimental data from literature, where a good agreement was achieved. The results suggest the adiabatic heat in the steel plates does not significantly influence the behaviour of the steel plates in both temperature-material properties models. The study then investigated the effect of combined blast loads and fire loading on the response of steel plates. The fire loading was applied by increasing the temperature in the steel from 200 °C to 1000 °C. Excessive deformation and thinning of the plate at the central area of the plate was observed. The thinning at the central area is pronounce than the thinning of the plate at the boundary between the clamp and the steel plate. Hence, the FE analysis suggests that the failure might occur at the central area of the plate, which could suggest a tearing type of failure. This type of failure is common in plates subjected to close-in blast loads. Therefore, this study has shown that the effect of adiabatic heat is insignificant, and the combined blast-fire loading might cause a similar type of failure as in plates subjected to blast loads only.

Experimental Study on the Durability of Steel Anchors for Prestressed CFRP Laminates under Accelerated Galvanostatic Corrosion.

The novelty of the present study is to address the durability of corroded anchors for prestressing CFRP laminates. Two types of steel anchors, clamp anchors and wedge anchors, were used to prestress CFRP laminates and then subjected to steel corrosion through a galvanostatic acceleration approach, which was followed by tensile tests. Compared to clamp anchors, wedge anchors showed a superior durability performance in terms of their prestress retention, anchor efficiency, and resistance to the slippage of the CFRP laminate. After accelerated corrosion for 144 h, the clamp anchor exhibited a prestress retention of 79.1% and an anchorage efficiency of 55%, and the percentages became 9.0% and 100% for the wedge anchor. The slippage rates of the clamp anchor and the wedge anchor were 0.036 mm/kN and 0.026 mm/kN, respectively. Therefore, the wedge anchor, which exhibited higher prestress tension and anchorage efficiency, performed better than the clamp anchor. The present work provides an apparatus for exploring the corrosion-induced durability of steel anchors and experimental evidence that helps refine the provision in the guidelines for addressing anchor durability.

Research on the Vibration Characteristics of Aviation Hydraulic Clamp and Pipeline Based on Hard Coating

Aviation hydraulic clamp-piping systems often experience damage due to vibration, which poses a great threat to the reliability and safety of the aircraft. In this paper, a hard coating is used as a new damping method to study the vibration characteristics of aviation hydraulic clamp-piping systems. Three kinds of coated clamp entities are obtained by optimization and preparation, and the combination of finite element simulation and experiment is used to analyze the vibration response of the high- and low-pressure rotor under fixed-frequency simple harmonic excitation, and the resonance response under sweep-frequency excitation of the aviation hydraulic clamp-piping system. Through orthogonal experiments, it is clear that 304 stainless steel clamps coated with 200-μm-thick YSZ-PTFE coating have the best vibration damping effect on the clamp-piping system; that is, the damping rate can reach 24.67% under fixed-frequency excitation, and swept frequency damping can reach 19.93%. The maximum error between the simulation and the experimental vibration response amplitude is 7.9%, which proves the correctness of the model and verifies that the YSZ-PTFE hard coating can significantly improve the vibration damping effect with very good application prospects.

Behavior of steel clamp confined brick aggregate concrete circular columns subjected to axial compression

Re-use of recycled aggregates in concrete has become a very sustainable solution owing to its environment-friendly and cost-effective nature. Clay bricks are most widely used in construction all over the world. Subsequently, waste generated from the demolition of clay-brick structures is most troublesome. Inherent porosity of bricks compromises the compressive strength of concrete with clay brick aggregates (C-CBA) that has rendered its use in structural concrete for quite some time. With some external clamping pressures, this deficiency can be countered. This study presents an experimental investigation into the use of steel clamps as a strengthening material for C-CBA. Steel clamps are cost-effective, readily available, and very easy to use. C-CBA were tested in two groups depending upon compressive strength: 15 & 35 MPa. Further, 3, 5, and 11 steel clamps were used in each group. Results suggested that steel clamps can effectively be used in enhancing the compressive strength of C-CBA to a level that is acceptable to be used in structural concrete. Increase in peak compressive strength of C-CBA was found to be proportional with the number of steel clamps employed. Three analytical concrete models were used to predict the compressive strength of C-CBA after strengthening. It was concluded that all three analytical models predicted well C-CBA compressive strength for 3-clamp specimens. However, their pre-diction accuracy was highly compromised as the number of steel clamps were increased.

TEST OF A NET DOME FRAGMENT

A geodesic or net dome, also known as a Fuller’s dome, is a spherical structure. Geodesic domes are well receptive to asymmetric loads, especially snow and wind, have high aerodynamics, increased rigidity and stability. It should be noted that the larger the diameter of the sphere, the greater its bearing capacity, and the strength of such dome slightly depends on the building materials used. With significant advantages, the design and construction of wooden net domes has not become widespread. The fact is that net domes are spatial structures with a large number of elements, which accordingly entails a large number of nodes. The elements of the dome are connected with dowels, wet film gauge, bolts, wood screws, staples, screws, nails. Adhesive connections on washers are used, also steel clamps, straps, overlays are applied. However, they all have disadvantages, the scope of each connector is different, and their cost is often comparable to the cost of the dome elements. We offer a universal connector for connecting dome parts at any angle. As a result of introduction of such technical decision of knot, we receive essential simplification of a design, reduction of quantity of components, at the same time with increase of its manufacturability. To study the operation of the joint of wooden glue-board elements of the dome with the use of a universal connector, its experimental studies were carried out. The purpose of the study: to study the actual operation of the connection of wooden parts of the dome with a universal connector in the form of rotating fasteners that rotate freely on the draw bolt, to assess its strength and deformability, to assess the possibility of using such a connection in the design of spatial structures. To solve the tasks, a full-scale fragment of the dome was tested, which includes characteristic nodes with rigid adjacency of elements to each other.

Research on Electromagnetic Field, Eddy Current Loss and Heat Transfer in the End Region of Synchronous Condenser with Different End Structures and Material Properties

Aiming at the problem of end structure heating caused by the excessive eddy current loss of large synchronous condensers used in ultra-high voltage (UHV) power transmission, combined with the actual operation characteristics of the synchronous condenser, a three-dimensional transient electromagnetic field physical model is established, and three schemes for adjusting the end structure of the condenser under rated condition are researched. The original structure has a copper shield and a steel clamping plate. Scheme 1 has no copper shield but has a steel clamping plate. Scheme 2 has no copper shield but has an aluminum clamping plate. By constructing a three-dimensional fluid–solid coupling heat transfer model in the end of the synchronous condenser, and giving the basic assumptions and boundary conditions, the eddy current loss of the structure calculated by the three schemes is applied to the end region of the synchronous condenser as the heat source, and the velocity distribution of the cooling medium and the temperature distribution of each structure under the three different schemes are obtained. In order to verify the rationality of the numerical analysis model and the effectiveness of the calculation method, the temperature of the inner edge of the copper shield in the end of the synchronous condenser is measured, and the temperature calculation results are consistent with the temperature measurement results, which provides a theoretical basis for the electromagnetic design, structural optimization, ventilation and cooling of the synchronous condenser.

Finite Element Analysis of the Parthenon marble block- steel clamp system response under acceleration

<p class="Abstract">Finite element analysis is employed to investigate the mechanical behaviour and failure scenarios of the marble block–steel clamp ancient masonry system utilised in the Parthenon (Athens Acropolis) under static loading analysis. The input data for the model are acquired by the laboratory testing of early 20th century restoration steel clamps, such as through tensile strength measurements and metallography, as well as bibliographic sources from various scientific fields (i.e. material properties, archaeometry, restoration, structural engineering and geology). Two different embedding materials (Portland cement mortar and lead), used for the nesting of the clamps, are examined under bending or stretching, induced by acceleration forces. The conservation status of the materials is taken into account by employing an intrinsic stress, as is the case when corrosion products build up in a confined space. The aim of this work is to provide a tool for the assessment of the conservation potential of the marble blocks in parts of the monument that require specific attention. Simulation results indicate the resilience of the Parthenon’s structural system under most examined scenarios and highlight the importance of intrinsic stresses, the existence of which may lead to the fracture of the marble blocks under otherwise harmless loading conditions.</p>

Experimental Investigations of Timber Beams with Stop-Splayed Scarf Carpentry Joints.

The paper presents the results of an experimental investigation of stop-splayed scarf joints, which was carried out as part of a research programme at the Wroclaw University of Science and Technology. A brief description and the characteristics of scarf and splice joints appearing in historical buildings are provided, with special reference to stop-splayed scarf joints (so-called ‘Bolt of lightning’) which were widely used, for example, in Italian renaissance architecture. Analyses and studies of scarf and splice joints in bent elements presented in the literature are reviewed, along with selected examples of analyses and research on tensile joints. It is worth noting that the authors in practically all the cited literature draw attention to the need for further research in this area. Next, the results of the authors’ own research on beams with stop-splayed scarf joints, strengthened using various methods, e.g., by means of drawbolts (metal screws), steel clamps and steel clamps with wooden pegs, which were subjected to four-point bending tests are presented. Load-deflection plots were obtained for load-bearing to bending of each beam in relation to the load-bearing of a continuous reference beam. A comparative analysis of the results obtained for each beam series is presented, along with conclusions and directions for further research.

Ensino-aprendizagem de cinética e eletroquímica com uso de atividades experimentais: estudo de caso no ensino superior

O ensino de química gera entre estudantes uma sensação de desconforto em função das dificuldades existentes no processo ensino-aprendizagem e em muitas vezes os docentes não estão preparados para atuar de forma interdisciplinar. Diante das dificuldades, faz-se necessário a busca por metodologias de ensino que abordem o assunto de maneira contextualizada e que atraiam a atenção dos discentes. Nesta vertente, a autora buscou desenvolver uma proposta de ensino contextualizada, por meio de experimento prático, que viesse a abordar os temas corrosão e cinética, com o intuito de desenvolver nos discente o pensamento crítico. Neste contexto, o presente trabalho teve como objetivo apresentar uma metodologia de “Estudo de Caso” por meio de observação experimental da corrosão de grampo tipo “U” galvanizado e não galvanizado em diferentes soluções eletrolíticas e assim encontrar a ordem da reação de corrosão pelas leis de integração de velocidade. A pesquisa seria de natureza quali-quantitativa, pois mostra a contribuição das observações experimentais para o processo de ensino-aprendizagem ao abordar os conteúdos de cinética e corrosão, além de encontrar a taxa de corrosão e a ordem da reação. Os discentes evidenciaram que o tipo de eletrólito influencia na velocidade de corrosão. Os grampos não galvanizados estão mais suscetíveis à corrosão quando se utiliza solução de NaOH. A solução do NaCl é relativamente fraca para se corroer o grampo, e em um meio aquoso ácido, a taxa de corrosão do grampo se mostra superior. A corrosão do grampo em diferentes soluções eletrolítica segue como uma reação de ordem zero.

Experimental Study on Microwave-Based Curing Process with Thermal Expansion Pressure of PTFE for Manufacturing Carbon Fiber/Epoxy Composites.

Conventional composite curing incur high production costs because of their long processing times. In contrast, microwave curing process (MCP) can reduce the production costs because both the mold and the composite parts can be heated directly. In this study, a mold consisting of polytetrafluoroethylene (PTFE), quartz glass, and stainless steel clamps was manufactured to cure composite specimens of carbon fiber and epoxy resin. Flame test was conducted prior to the MCP to confirm whether the spark occurred in the mold and the composite prepreg. Uniaxial tensile tests and three-point bending tests were then conducted to obtain the mechanical properties of the composite specimens according to the input power and the processing time. The mechanical properties of the composite specimens fabricated by MCP were compared with those of composite specimens manufactured by PCF. The results show that MCP can cure the composite prepreg more rapidly than PCF and can attain comparable mechanical properties.

ПРИМЕНЕНИЕ МЕТОДА ПЛАЗМЕННОГО СИЛИЦИРОВАНИЯ ДЛЯ ПОВЫШЕНИЯ ИЗНОСОСТОЙКОСТИ ДЕТАЛЕЙ

Modern technologies are the most important component for any state. Today, advanced technologies allow to create any mechanisms at the level of atoms and molecules. For the production of machines, aggregates and their individual components, new nanomaterials and nanotechnologies are used, which reduce friction repeatedly and with high efficiency, protect parts from damage, save energy and increase the reliability of machine parts as a whole. Virtually in any mechanism, some parts focus on the main load. In this study, such a detail is the steel clamping collet 65G. A method of plasma siliconizing is proposed for hardening its inner surface. The raise of this characteristics will allow to increase its service life, and therefore will ensure more reliable operation of both a separate mechanism and production as a whole. This allows the enterprise to become cost-effective and competitive. In this paper, the magnitude of the effect of the silicon atoms introduction into the surface layer of a part on wear resistance and durability is investigated. Research and subsequent processing of the results using Statistica software for statistical analysis shows an increase in the strength characteristics by 2.6 times.