scholarly journals РАДИАЛЬНОЕ ОБЖАТИЕ ПОРИСТЫХ ВТУЛОК ИЗ ЖЕЛЕЗO-СТЕКЛА, УПРОЧНЯЕМЫХ В ЖЕСТКОЙ ОПРАВКЕ

2021 ◽  
Vol 06 (02) ◽  
pp. 29
Author(s):  
Тахир Джаббаров Тахир Джаббаров
Keyword(s):  
Composite Material ◽  
Cast Iron ◽  
Iteration Method ◽  
Initial Approximation ◽  
The Body ◽  
Powder Composite ◽  
Radial Compression ◽  
True Solution ◽  
Porous Sleeve

The article discusses the radial reduction of porous bushings made of powder composite material "iron-cast iron-glass", hardened in a rigid mandrel, which is an energetically more favorable process.It was found that during radial compression of porous bushings in a rigid mandrel, the density of the body being compacted is uniformly distributed along the radius. The result obtained in this case can be considered as an initial approximation to the true solution of the problem, which is found by the iteration method. Keywords: radial, reduction, porous, sleeve, mandrel, density, compaction, uniformly, method, iteration.

scholarly journals The DESIGN OF FIBER METAL LAMINATE AS A BODY MATERIAL WITH CARBON FIBER METHOD

2021 ◽  
Vol 2 (Oktober) ◽  
pp. 50-56
Author(s):  
Muhammad Juliansyah Winarto ◽  
Lalu Saefullah ◽  
Willem Loe Mau
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
The Body ◽  
Vehicle Body ◽  
Vehicle Engine ◽  
Steel Material ◽  
Fiber Metal Laminate ◽  
Combat Vehicle ◽  
Fiber Metal ◽  
Armored Vehicle

The combat vehicles that Indonesia Army belong to most of the materials are steel, for example the armored vehicle anoa 6x6. Steel material is used as a fire protection on the vehicle, it will greatly affect the performance of the vehicle. It is caused the steel material has a high density, which is around 7750 kg/m3to 8050 kg/m3. So, with a large enough volume of the vehicle body, it will increase the burden of the vehicle. As well as the engine load will increase, and more power is needed to be able to move the vehicle. Seeing these problems, it is necessary to have a research or study on alternative materials to replace the body of a combat vehicle that can withstand fire from opposing weapons that cause personnel to be injured. In this study, experimental and simulation methods were used using the ansys application to analyze the strength of the composite material in the form of an aluminum layer that had been treated to increase the hardness value. Furthermore, it is coated with a composite material using a carbon fiber matrix of epoxy, HGM and polyurethane. The coating material is called Fiber Metal Laminate (FML), so the material used has a lighter density, the load received by the vehicle engine is lighter, and the performance of the vehicle will be more effective and efficient.

scholarly journals Design and Construction of an Electric Guitar Body Made of Carbon Composite

2021 ◽  
pp. 101-106
Author(s):  
Radoslav Vandžura ◽  
Vladimír Simkulet ◽  
Michal Hatala
Keyword(s):  
Composite Material ◽  
Carbon Composite ◽  
The Body ◽  
Electric Guitar ◽  
Carbon Composite Material ◽  
Selection Of ◽  
Design And Construction

This paper presents the selection of technology, technological and working procedures to construct the body of an electric guitar (Stratocaster type.). The used material for the electric guitar construction was carbon composite material offset by standardly used components. The carbon composite was chosen because of its excellent properties suitable for guitar construction. Described and used technologies were Manual Wet Lamination Technology and Vacuum Bag Molding (VBM) technology, and both are affordable and uncomplicated methods.

Application of Variational Iteration Method for nth-Order Integro-Differential Equations

2009 ◽  
Vol 64 (7-8) ◽  
pp. 439-444 ◽  
Author(s):  
Said Abbasbandy ◽  
Elyas Shivanian
Keyword(s):  
Differential Equations ◽  
Iteration Method ◽  
Initial Conditions ◽  
Initial Approximation ◽  
Variational Iteration Method ◽  
Integrodifferential Equations ◽  
Variational Iteration

AbstractIn this paper, the variational iteration method is proposed to solve Fredholm’s nth-order integrodifferential equations. The initial approximation is selected wisely which satisfies the initial conditions. The results reveal that this method is very effective and convenient in comparison with other methods.

Investigation of the Diffusion Couple Ductile Cast Iron / Iron

2020 ◽  
Vol 405 ◽  
pp. 54-59
Author(s):  
Susanne Strobl ◽  
Roland Haubner
Keyword(s):  
Heat Treatment ◽  
Composite Material ◽  
Cast Iron ◽  
Diffusion Couple ◽  
Diffusion Zone ◽  
Pure Iron ◽  
Ductile Cast Iron ◽  
Carbon Solubility ◽  
Small Diffusion ◽  
Iron Iron

Forging of ductile cast iron with pure iron by the Damascus technique, results in a new composite material. The combination of cast iron and pure iron is unusual because of its rather different properties. After forging these two materials a small diffusion zone of about 150 µm was observed. Various heat treatments at 900 °C for 2, 4 or 20 hours and 950 °C for 4 h were performed to increase the diffusion zone up to 2.4 mm. At 900 °C carbon solubility in austenite is about 1.2 wt. % and at 950 °C 1.4 wt. %. During the heat treatment carbon diffuses from cast iron into the pure iron and the diffusion gradient grows with time and temperature. Furthermore, the samples were air cooled or water quenched. In the ductile cast iron, graphite nodules are surrounded by ferrite. During the heat treatment graphite is dissolved and pores are observed. In the diffusion gradient layer, a broad range of microstructures observed in hyper- and hypoeutectoid steels could be found. The microstructures were revealed by different etchants and moreover, hardness measurements were performed.

Tunable Contact of Epidermal Electronics With Skin Based on Ionic Polymer–Metal Composite Material

2019 ◽  
Vol 86 (6) ◽  
Author(s):  
Weitong Chen ◽  
Xinsheng Ren ◽  
Qitao Wang ◽  
Jian Wu
Keyword(s):  
Composite Material ◽  
Human Body ◽  
The Body ◽  
Metal Composite ◽  
Ionic Polymer Metal Composite ◽  
Ionic Polymer ◽  
Electrophysiological Signals ◽  
Polymer Metal ◽  
Contact Characteristic ◽  
Epidermal Electronics

Epidermal electronics mounted on the body provides the robust and noninvasive interfaces to monitor the electrophysiological signals of human body. The contact characteristic of the epidermal electronics with the skin affects the accuracy of the measured signals. In this paper, ionic polymer–metal composite is used to regulate the interface force for the consistency of the contact performance. The patterns of the ionic polymer–metal composite are designed for the flexibility and the contact characteristic of the epidermal electronics with the skin. This study provides an approach for the adjustment of the contact characteristic, which is very valuable for the longtime accurate monitoring of the epidermal electronics attached on the skin.

scholarly journals Experiments on the friction and abrasion of the surfaces of solids

1833 ◽  
Vol 2 ◽  
pp. 364-365
Keyword(s):  
Experimental Investigation ◽  
Cast Iron ◽  
17Th Century ◽  
The Body ◽  
Horizontal Surface ◽  
Rapid Review ◽  
Wide Field ◽  
Surface Time ◽  
Previous Contact ◽  
The Subject

The first part of this paper is occupied by a rapid review of the labours of mechanicians on the subject of friction, from the period of those of Amontons at the end of the 17th century, to those of Coulomb and of Vince in the years 1779 and 1784; from which the author draws the conclusion that the progress of knowledge in this department of science has been slow and unsatisfactory, and that a wide field is still left open to experimental investigation. With a view to elucidate several points not yet sufficiently ascertained by former writers, the author instituted several sets of experiments; some calculated to determine the forces required for dragging bodies of various kinds along a horizontal surface, and others for measuring the angle at which a plane was required to be inclined to the horizon in order to admit of the body sliding down it, attention being paid to the circumstances of pressure, extent of surface, time of previous contact, and velocity of motion. The following are the principal conclusions which the author deduces from his experiments. The friction of ice rubbing upon ice diminishes with an increase of weight; but without observing any regular law of increase. When dry leather is made to move along a plate of cast iron, the resistance is but little influenced by the extent of surface. With fibrous substances, such as cloth, the friction diminishes by an increase of pressure, but is greatly increased by the surfaces remaining for a certain time in contact; it is greater, cœteris paribus , with fine, than with coarse cloths; the resistance is also much increased by an increase of surface. With regard to the friction of different woods against each other, great diversity and irregularity prevail in the results obtained; in general the soft woods give more resistance than the hard woods: thus, yellow deal affords the greatest, and red teak the least friction. The friction of different metals also varies principally according to their respective hardness; the soft metals producing greater friction under similar circumstances than those which are hard. Within the limits of abrasion, however, the amount of friction is nearly the same in all the metals, and may in general be estimated at one sixth of the pressure. The power which unguents have in diminishing friction, varies according to the kind of the fluidity of the particular unguent employed, and to the pressure applied.

scholarly journals Variational Iteration Method for Solving the Generalized Degasperis-Procesi Equation

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Qian Lijuan ◽  
Tian Lixin ◽  
Ma Kaiping
Keyword(s):  
Approximate Solution ◽  
Exact Solutions ◽  
Lagrange Multiplier ◽  
Iteration Method ◽  
Initial Approximation ◽  
Variational Iteration Method ◽  
Original Equation ◽  
Variational Iteration

We introduce the variational iteration method for solving the generalized Degasperis-Procesi equation. Firstly, according to the variational iteration, the Lagrange multiplier is found after making the correction functional. Furthermore, several approximations ofun+1(x,t)which is converged tou(x,t)are obtained, and the exact solutions of Degasperis-Procesi equation will be obtained by using the traditional variational iteration method with a suitable initial approximationu0(x,t). Finally, after giving the perturbation item, the approximate solution for original equation will be expressed specifically.

Research on Composite Materials Used for Brake Shoes Manufacture

2016 ◽  
Vol 254 ◽  
pp. 207-211 ◽  
Author(s):  
Erika Popa ◽  
Liviu Pascu ◽  
Ana Socalici ◽  
Marius Ardelean
Keyword(s):  
Composite Material ◽  
Cast Iron ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Contact Zone ◽  
Laboratory Experiments ◽  
Rolling Stock ◽  
Brake Shoe ◽  
Materials Used

The paper relates laboratory experiments in order to obtain a composite material used for brake shoe manufacture. Regarding the testing materials were processed 38 samples. The percentage and composition of materials are: 15-45% novolac, 1,5-10% hexametyltetramin, 0-8% sulfur, 0-15% carbon fiber, 0-20% graphite, 0-25% aluminum, 15-28% brass and 0-40% rubber. The evolution of tribological and temperature parameters were analyzed in the contact zone tribological testing disk - split pin method. The composite material has the role to replace the classic material (cast iron) used in brake shoes composition in order to reduce the noise caused by rolling stock.

A composite material with a matrix of high-chromium cast iron

1979 ◽  
Vol 21 (11) ◽  
pp. 819-821
Author(s):  
V. P. Ponomarenko ◽  
V. P. Stoiko ◽  
A. Ya. Shvartser
Keyword(s):  
Composite Material ◽  
Cast Iron ◽  
High Chromium ◽  
High Chromium Cast Iron ◽  
Chromium Cast Iron

scholarly journals FUNCTION AND SAFETY EVALUATION OF 3D TECHNOLOGY TO PREPARE BONE REPAIR BIOMATERIALS

2021 ◽  
Author(s):  
Huseyn Elcin
Keyword(s):  
Tensile Strength ◽  
Composite Material ◽  
3D Printing ◽  
Biological Evaluation ◽  
The Body ◽  
3D Scaffold ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Proliferation And Differentiation

PLGA/HA composite biomaterials are prepared, and 3D printing technology is used to make bone scaffolds that can be implanted in the body. Its performance is tested by in vitro physical and biological methods, and its safety is evaluated by animal experiments. Methods: 3D printing technology was used to print the PLGA/HA composite three-dimensional stent biomaterial, and the tensile strength and bending strength of the stent material were tested with reference to GB/T1040 and GB/T9341 to verify its ability to support the proliferation and differentiation of hMSC. The biological evaluation standard (GB/T16886) evaluates the biocompatibility and biosafety of scaffoldmaterials in vitro and in vivo. Results: The porous 3D scaffold made of PLGA/HA composite material was successfully fabricated; the mechanical tensile strength and flexuralstrength of the composite material were 38 MPa and 42 MPa respectively, which were5.35 times and 5.25 times that of normal human cartilage; in vitro cell test It is proved that the 3D scaffold can support the proliferation and differentiation of hMSC into chondrocytes. The results of the biosafety test show that the scaffold meets the national medical device biological evaluation standards.

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