METHODS OF TESTING RING SAMPLES MADE OF PLASTIC COMPOSITE MATERIALS USED IN THE AVIATION INDUSTRY AND THE ESTIMATED EVALUATION OF THEIR EFFECTIVENESS

2019 ◽  
Vol 6 (4) ◽  
pp. 68-71
Author(s):  
Mikhail Mikhailovich Polovin ◽  
Egor Vadimovich Nazarov ◽  
Evgeniy Vasilyevich Zhuravlev ◽  
Denis Sergeevich Shavelkin
Keyword(s):  
Mechanical Properties ◽  
Comparative Analysis ◽  
Composite Materials ◽  
Aviation Industry ◽  
Advantages And Disadvantages ◽  
Plastic Composite ◽  
Materials Used ◽  
Definition Of ◽  
The Given

In relation to the increase in the proportion of composite materials used in the design of modern aircraft, the most acute issue is the issue of confirming the characteristics of materials during their testing. In this paper, the methods of testing composite materials used in the elements of the glider design are analyzed, and the estimated assessment of the methods analyzed is made.Within the limits of the given work the comparative analysis of existing and perspective methods of carrying out of tests of ring samples from composite materials for the purpose of an estimation of their efficiency regarding definition of mechanical properties is carried out. The advantages and disadvantages of each method are determined.

scholarly journals Substantination of carbon fiber as an innovative materials for fistening of mining workings of coal mines

2021 ◽  
Vol 64 ◽  
pp. 112-121
Author(s):  
I Sheka ◽  
Ye Tsivka
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Comparative Analysis ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Coal Mines ◽  
Physical And Mechanical Properties ◽  
Metallic Materials ◽  
Advantages And Disadvantages ◽  
Mine Workings

Purpose. To analyze composite materials and prospects of their use as fastening materials for mining of coal mines.Perform a comparative analysis of the physical and mechanical properties of the innovative material carbon fiber and metallic materials, as well as compare their features. To determine the possibility of using carbon fiber as a fastening material for mining of coal mines. Research methodology. The generalization of physical and mechanical properties of carbon fiber on the basis of its analysis is performed. The features of mechanical properties of carbon fiber, steel and aluminum are compared, which showed that this composite material has the best physical and mechanical properties and it is expedient to use it in the fastening elements of mine workings. Research results. The areas of use of composite materials in industry are analyzed and generalized, and it is concluded that it is better to use carbon fiber as a fastening material for coal mine workings. A comparative analysis of the physical and mechanical properties of carbon fiber and steel is performed, which shows that this composite material has identical (and sometimes even better) properties as metallic materials. The advantages and disadvantages of carbon fiber as a fastening material for mining of coal mines are estimated. It is specified that the restraining factor, today, is the cost of carbon fiber, and later their price will decrease and demand will increase. It is concluded that when using this composite material in the fasteners of mine workings, it is possible to increase the pace of their implementation, reduce the complexity of the work performed and improve working conditions while facilitating the design. Scientific novelty. It is established that carbon fiber as a composite material can be used in the fastening elements of the preparatory workings of coal mines. Practical value. According to the results of the analysis, it is established that carbon plastics can be used in the fastening elements of mine workings, which will promote the development of underground coal mining.

Mechanical Properties of 3D-Printed Wood-Plastic Composites

2018 ◽  
Vol 777 ◽  
pp. 499-507 ◽  
Author(s):  
Ossi Martikka ◽  
Timo Kärki ◽  
Qing Ling Wu
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
3D Printing ◽  
Impact Strength ◽  
Polylactic Acid ◽  
Wood Plastic Composite ◽  
Wood Plastic Composites ◽  
Plastic Composite ◽  
Plastic Composites ◽  
3D Printed

3D printing has rapidly become popular in both industry and private use. Especially fused deposition modeling has increased its popularity due to its relatively low cost. The purpose of this study is to increase knowledge in the mechanical properties of parts made of wood-plastic composite materials by using 3D printing. The tensile properties and impact strength of two 3D-printed commercial wood-plastic composite materials are studied and compared to those made of pure polylactic acid. Relative to weight –mechanical properties and the effect of the amount of fill on the properties are also determined. The results indicate that parts made of wood-plastic composites have notably lower tensile strength and impact strength that those made of pure polylactic acid. The mechanical properties can be considered sufficient for low-stress applications, such as visualization of prototypes and models or decorative items.

ON ECONOMIC ASSESSMENT OF BALLASTLESS TRACK STRUCTURE EFFICIENCY

2017 ◽  
pp. 63-69
Author(s):  
Ludmila Andreyeva ◽  
Yevgeniy Svintsov ◽  
Yelena Tarasevich
Keyword(s):  
Comparative Analysis ◽  
Practical Importance ◽  
Economic Assessment ◽  
Track Structure ◽  
Advantages And Disadvantages ◽  
Ballastless Track ◽  
Study Results ◽  
Ballast Track ◽  
The Given

Objective: To describe the regulation of railroad traffic parameters in modern conditions, that lead to the necessity of putting into operation the new systems of track design, relevant for regulations in question. Methods: The method of matching, as well as the method of comparative analysis was applied in the study. Results: The advantages and disadvantages of ballastless track structure and conventional ballast track design were compared. The possibility of extensive application of ballastless track structure on modern railroads was analyzed. Practical importance: Ballastless track structure implementation will make it possible to solve practical tasks of using the given type of track design in transport construction.

The Effect of Modifying Agents on the Mechanical Properties of Straw Flour/Waste Plastic Composite Materials

2016 ◽  
Vol 723 ◽  
pp. 56-61 ◽  
Author(s):  
Zheng Hao Ge ◽  
Dan Ge Si ◽  
Yun Li Lan ◽  
Mei Nong Shi
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Coupling Agent ◽  
High Speed ◽  
Waste Plastic ◽  
Plastic Composite ◽  
Plastic Composites ◽  
Twin Screw ◽  
Styrene Butadiene ◽  
Butadiene Styrene

Though there has been a large number of studies concerning the modification of wood plastic composite materials, there is still more to be done. This report aims to study the effect of the coupling agents (PP-g-MAH, silane, titanate) and compatibilizer(SBS) on the mechanical properties of straw flour/waste plastic composites. Straw flour, waste plastic, modifying agents and other additives were mixed evenly in a high speed mixing machine. And the mixed materials were compounded into the pelllets using the twin-screw extruder. Then the test specimens were prepared by the injection molding. The influence of 4% coupling agent (PP-g-MAH, silane, titanate) on the mechanical properties of straw flour/waste plastic composites was researched, and the most suitable coupling agent to the composites was obtained. In order to increase the toughness of the composite materials and to furthermore improve the comprehensive mechanical properties, the WPCs with different contents styrene butadiene styrene (SBS) were investigated. The experimental results showed that the coupling agent PP-g-MAH and the content was 4%, the mechanical properties of the composite materials were better; when SBS content was 5%, the maximum increases of tensile strength, flexural strength and impact strength of SBS modified WPCs were by 14.34%, 20.75%, 34.38% compared to those of neat WPCs respectively.

Effect of SiO2 and Al2O3 Hybrid Nano Materials on Fatigue Behavior for Laminated Composite Materials Used to Manufacture Artificial Socket Prostheses

2021 ◽  
Vol 1039 ◽  
pp. 493-509
Author(s):  
Nesreen Dakhel ◽  
Ameer A. Kadhim ◽  
Rasha Hayder Al-Khayat ◽  
Muhannad Al-Waily
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Experimental Work ◽  
Numerical Technique ◽  
Fatigue Behavior ◽  
Laminated Composite ◽  
Fatigue Loading ◽  
Maximum Error ◽  
Fatigue Properties ◽  
Materials Used

Most artificial socket prostheses are applied to fatigue load; therefore, more failure of socket prostheses occur due to fatigue loading. Then, it was necessary to improve the fatigue characterizations of composite materials used to manufacture the artificial socket prostheses by using hybrid nanomaterials, with different types and amounts. So, this work suggested mixing two nanomaterials types to improve the mechanical and fatigue properties of composite materials. Therefore, the experimental work used to manufacture tensile and fatigue samples of composite with different nanoweight fraction effects, in addition to calculating the mechanical properties and fatigue behavior for its composite. There, strength and modulus of elasticity, in addition to, fatigue strength and life evaluating of composite with different nanomaterials mixing. Also, the numerical technique by using the finite element method is used to calculate fatigue life and strength of composite materials. Also, comparison fatigue results were calculated by experimental work with fatigue results evaluated by numerical technique to give the discrepancy for results evaluation. Hence, the comparison of results showed good agreement for the technique used to evaluate the fatigue behavior of composite materials with the nanoeffect, where, the maximum error did not exceed (11.86%). Finally, the results have shown that the reinforcement by mixing two Nanomaterial types lead to improvement in the mechanical properties and fatigue behavior to more than (35%) and increasing the mechanical properties and fatigue behavior to (10%) more than the increase of properties and fatigue characterizations reinforcement by one Nanomaterial type.

Dynamic Thermal Mechanical Behaviors and Mechanical Properties of Reversible Thermochromism Wood-Plastic Composite

2017 ◽  
Vol 727 ◽  
pp. 571-578
Author(s):  
Yue Qin Wen ◽  
Ying Ying Sun ◽  
Jian Feng Xu ◽  
Jing Bing Chen ◽  
Xin Xiang Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Color Change ◽  
Loss Modulus ◽  
Wood Plastic Composite ◽  
Advantages And Disadvantages ◽  
Plastic Composite ◽  
Before And After ◽  
The Difference ◽  
Reversible Thermochromism

To prepare a late-model and functional wood-plastic composite (WPC), the reversible thermochromism crystal violet lactone microcapsule was prepared by situ polymerization, then fabricated reversible thermochromism WPC by microcapsule and low density polyethylene with Maleic anhydride grafted polyethylene. Comparing the L, a and b data of apparent color of reversible thermochromism WPC, the value of chromatism (ΔE) showed the difference of heating before and after, it was also measured to characterize the color-change level; the mechanical properties of ordinary WPC and reversible thermochromism WPC were measured respectively to compare the advantages and disadvantages of two kinds of WPC; Then the storage modulus and loss modulus of ordinary WPC and reversible thermochromism WPC were determined to distinguish the good from the bad of two kinds of composites. The results indicated that the reversible thermochromism WPC is a functional composite with noticeable color-changed effects, and tensile strength, bending strength and interface compatibility were better than ordinary WPC, but had worse impact property contrarily.

scholarly journals Comparative characteristics of the methods for determining the somatic sex of an adult person with the use of a skull

2018 ◽  
Vol 20 (3) ◽  
pp. 207-213
Author(s):  
I V Gaivoronsky ◽  
O M Fandeyeva ◽  
G I Nichiporuk ◽  
M G Gaivoronskaya
Keyword(s):  
Comparative Analysis ◽  
Sex Determination ◽  
Comparative Assessment ◽  
Regression Equations ◽  
Advantages And Disadvantages ◽  
Foreign Literature ◽  
Complex Approach ◽  
Modern Methods ◽  
Diagnostic Signs ◽  
Definition Of

The analysis of Russian and foreign literature on the definition of somatic sex on the skull is presented. Cranioscopic and craniometric approaches are considered in carrying out craniological studies and existing traditional and modern methods for their implementation. Cranioscopic studies reveal the advantages and disadvantages of W.M. Krogman, G. Acsadi, J. Nemeskeri and V.N. Zvyagina methods. It is shown that the method of V.N. Zvyagina, which includes 40 descriptive diagnostic signs, is the most informative. Its efficiency is 93,5%. The comparative analysis of the craniometric methods for studying the skull according to R. Martin and H. Welcker in the modification of A.P. Bogdanov and a number of English craniologists is presented. The authors point out that the Russian Forensic Center developed a craniological form, which includes 79 different sizes of a skull, by which is possible to determine not only the sex of a skull, but also the approximate age of a person. A comparative assessment of the Russian (V.I. Pashkova) and foreign (E. Giles) craniometric studies is presented. According to V.I. Pashkova using only craniometric techniques allows one to determine the sex of the skull only in 75-80%, and in the complex approach - in 80-93%. The method of E. Giles, based on the study of regression equations, is objective in 83-86%. Thus, studies of the sex determination by skull in an adult should be comprehensive, including both cranioscopic and craniometric techniques.

scholarly journals POLYMER CONCRETE MIXTURES – APPLICATION IN ENGINEERING INDUSTRY

STED JOURNAL ◽  
2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Robert Poklemba ◽  
Jozef Zajac ◽  
Darina Duplakova ◽  
Peter Cizmar ◽  
David Goldyniak
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Composite Materials ◽  
Material Properties ◽  
Physical And Mechanical Properties ◽  
Strength Properties ◽  
Engineering Industry ◽  
Polymer Concrete ◽  
Advantages And Disadvantages ◽  
Concrete Mixtures

This article discusses the properties of concrete composite materials based on their contexture. Systematic and interactive approaches are required in order to achieve optimal material properties in the preparation of composite materials. In order to predict the physical and mechanical properties of each component of the composite material but also as a whole, its optimization, not only the mechanical but also the material properties under different working conditions, requires a combination of different methods and technologies. The advantage of each composite is its specific properties that cannot be achieved by any component of the composite material alone. The strength of the materials based on polymer concrete mixtures can be compared to the strength properties of metals. On the other hand, this material has elastic properties which give the material a high degree of flexibility. When compared to conventional materials, the value of polymer composites is assessed not only in terms of excellent mechanical properties but also in terms of their low weight and cost. The aim of the paper is to describe the advantages and disadvantages of composites based on polymer concrete mixtures.

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