Comparative Analysis of Methods for Assessing Adhesion Strength of Thermal Spray Coatings

The paper presents the comparative analysis of existing methods for accessing the adhesive strength of thermally sprayed coatings on witness samples and products in research and industrial laboratories. The adhesive method of normal separation for cylindrical witness samples with a diameter of 25 mm, a height of 16...45 mm and a coating thickness of at least 0.2 mm is pointed out among the quantitative approaches described in both international and domestic standards. An alternative pin test having no restrictions on the ultimate strength of adhesion was used to evaluate conical witness samples with an end section diameter of 1.5...2.0 mm and a coating thickness of 0.3...0.5 mm. The shear method presents two possible adhesion measurement tests: with cylindrical witness samples having the diameter of 25 mm, the width of the annular coating section of 4 ... 30 mm and the thickness of the working layer not exceeding 0.1 mm and prismatic ones with linear dimensions of shear section of 2.5...5.0 mm and the coating thickness of at least 0.25 mm. During the tests all methods were characterized by irregular loading of the flat section of the coating. Mathematical models for calculating the actual value of the tensile and shear adhesion strength are presented, taking into account the appearance of additional bending and shear forces when loading the coating.

JUSTIFICATION OF CHANGE OF REQUIREMENTS TO NUMBER OF INDICATORS IN SOME STANDARDS ON WOOD PROCESSING

For production of case furniture wood-shaving plates (DSTP) and medium-density fiber boards - plates of the PMV wood monostructural fibrous brand (plate MDF) are widely used. And, both faces, and edges of plates come to production of furniture the revetted thermosetting polymeric films, sliced veneer or other cladding materials, for example paper-based laminated plastic (BSP). One of the main defects of such plates is the insufficient durability of their outside or surface layers of face that is one of shortcomings of plates as leads to flaking of cladding material. And, when flaking the facing layer entrains part of surface layer of plate. Indicator of durability of skin of plates is the specific resistance to normal separation of layer at depth of 0,3 - 0,7 mm from plate surface which is defined in accordance with GOST 23234-2009 [1]. However, as have shown results of our researches, in a number of standards on wood processing it is necessary to make changes in part of test method of plates on the specific resistance to normal separation of layer of skin not at depth of 0,3 - 0,7 mm (as in accordance with GOST 23234-2009), and surface layer. In this regard it is necessary to make changes to state standard specifications 10632-2014 [2] and 32274-2013 [3] on required values of specific resistance to normal separation of surface layer, but not layer at depth of 0,3 - 0,7 mm from plate surface.

Underground pipeline stresses caused by damage near anchor mounting

The article considers the issues of underground pipeline strength, which are operated in geological or technogenic complication conditions (movements of indigenous soil in the tectonic fault zone, mutual displacements and rotations of rock blocks, etc.). The work aims at studying of a mobility limitation effect of a pipeline anchorage imposed on the stress state in the pipe wall in the site of a local damage foundation. The pipeline static was investigated in a geometrically linear formulation, modeling it with a tubular cross-section, and with a momentless cylindrical shell for straight issues. The interaction of the pipe with a dense base through soil backfill was described by the hypothesis of Winkler's elastic layer. The deformation of the anchored pipe caused by base local continuity disturbances was studied, which was modeled by the given jumps of longitudinal displacement and the block angle of rotation. This approach makes it possible to evaluate the strength of long underground communications not on the external load from the ground, which is usually unknown, but according to the observed parameters of riverside movements. The limiting state of the pipeline under the internal pressure of the transported product and under additional loading from kinematic perturbation was investigated by the energy theory of strength. The authors formulated boundary value problems for differential tensile-compression equations and torsion of a straight bar with discontinuous right-hand sides. On the basis of analytical solutions to the problems, the effect of normal separation crack damage, foundation blocks convergence and their turn around the axis of the pipe on the stress-strain state of the pipeline was studied. Plots of displacement distribution, angles of rotation and equivalent stresses of von Mises are constructed depending on the magnitude and direction of the mutual displacement and reversal of the riverside at different distances from the anchor to the base defect. It has been found that overlapping anchors in the form of anchorage leads to a significant increase in the equivalent stresses in the pipe. It has also been found that for pipes under internal pressure, the approximation of the base blocks is more dangerous than their divergence.

A Distributed Multi-Competitive Clustering Method for Wireless Sensor Networks using 5G LTE

Fifth era remote, or 5G, is the most recent emphasis of cell innovation, designed to extraordinarily build the speed and responsiveness of remote systems. With 5G, information transmitted over remote broadband associations could go at rates as high as 20 Gbps by a few appraisals surpassing wire line organize speeds and in addition offer inactivity of 1 ms or lower for utilizes that require ongoing criticism. 5G will likewise empower a sharp increment in the measure of information transmitted over remote frameworks because of more accessible transfer speed and propelled reception apparatus technology. Wireless sensor systems (WSNs) require basic and successful ways to deal with lessen vitality utilization in view of restricted vitality. Grouping hubs is a compelling way to deal with make WSNs vitality productive. In this paper we propose a dispersed multi-aggressive bunching approach (DMCC) for WSNs. To start with, the hubs with high leftover vitality are chosen to go about as group head hopefuls (CHCs). Second, bunch heads (CHs) are chosen from the CHCs in light of a crossover of rivalry. In the event that the separations to the chose CHs are reasonable, a CHC with more neighbour hubs and littler normal separation to its neighbour hubs will probably turn into a CH. In the event that the quantity of CHs chose from the CHCs is insufficient, more CHs are chosen from non-CHCs constantly as indicated by lingering vitality until the CHs number is reasonable. DMCC makes the CHs number stable and disperse the CHs equally. Recreation tests were performed on to contrast DMCC and some related bunching approaches. The exploratory outcomes recommend that DMCC adjusts the heap among various groups and lessens the vitality utilization, which enhances the system lifetime.

Layered composite and contact layer. Normal separation and transversal strength

As well as testing adhesion joints, in which the average adhesion shear strength is measured, there are widespread methods of testing for normal separation, in which the value called transversal strength is measured. This value is calculated as the ratio of the breaking load applied perpendicular to the gluing plane, to the gluing area. At the same time, two types of tests for normal separation - for cylindrical and prismatic joints - are now standardized. The article deals with the solution of this problem for prismatic compound obtained on the basis of the contact layer model.

Control Flow Graph Based Multiclass Malware Detection Using Bi-normal Separation

<p>Control flow graphs (CFG) and OpCodes extracted from disassembled executable files are widely used for malware detection. Most of the research in static analysis is focused on binary class malware detection which only classifies an executable as benign or malware. To overcome this issue, CFG based multiclass malware detection system that automatically classifies the malware into their respective families is proposed. The use Bi-normal separation (BNS) as a feature scoring metric. Experimental results show that proposed method using BNS outperforms compared to hitherto use technique of document Frequency for multiclass metamorphic malware detection and achieves detection accuracy of 99.5 per cent.</p><p> </p>