THE INFLUENCE OF SECTION FORM OF METAL STRUCTURE ELEMENTS ON CORROSION WEAR

2020 ◽  
pp. 15-18
Keyword(s):  
Technological Process ◽  
Metal Structure ◽  
Corrosion Wear ◽  
Cross Sectional ◽  
Corrosion Resistant ◽  
Metal Structures ◽  
Aggressive Environment ◽  
Profile Element ◽  
The Cross ◽  
Section Form

The article provides the corrosion examples in metal structures, as well as their types. In most cases, metal structures are used in buildings with an aggressive environment. Corrosion is influenced by factors such as humidity, dust, various gases, technological process and etc. And also corrosion is influenced by the cross-sectional shapes which made the structural rods. There are given recommendations for the corrosion-resistant profiles use in metal structures and measures for their protection against corrosion. Keywords: corrosion, gas, dustiness, aggressive environment, operation, humidity, condensate, profile element, wear, destruction, durability, speed, section.

scholarly journals Substantiation of parameters of metal structure elements of mining transport machines

2020 ◽  
Vol 1 (2) ◽  
pp. 110-116
Author(s):  
Ol’ga Rashidovna PANFILOVA ◽  
◽  
Natal’ya Vladimirovna DYORINA ◽  
Vladimir Semenovich VELIKANOV ◽  
◽  
...  
Keyword(s):  
Surface Area ◽  
Cross Section ◽  
Metal Structure ◽  
Design Parameters ◽  
Optimal Parameters ◽  
Metal Consumption ◽  
Metal Structures ◽  
Metal Construction ◽  
The Cross ◽  
Mining Vehicles

The relevance of the work is due to the need to reduce the metal consumption of mining vehicles while maintaining the strength characteristics of their metal structures. An effective tool for finding the best option for combining the design parameters is optimization theory from the point of view of obtaining the design with the required properties. The implementation of the principles and approaches of this theory in relation to the metal structures of mining transport vehicles allows achieving a combination of their geometric characteristics, which makes it possible to obtain the smallest mass and dimensions. Purpose of the work: development of the principle of obtaining mathematical dependencies, allowing to determine the most suitable shape and size of the cross section for the elements that make up the metal structures of mining vehicles, taking into account the direction of the loads perceived by each element. Research methodology. An optimization approach is used, including the definition of the design parameters, the formulation of the objective function and the restrictions imposed on the design parameters. Results and their application. The factors affecting the value of the optimal parameters in the elements of the metal structures of mining vehicles are established. The optimal parameters of the cross section are substantiated for various combinations of the perceived load direction and the priority requirements for metal construction. The obtained recommendations can be applied in the design of frames with a minimum weight or dimensions. Conclusions. The recommendations presented allow us to reasonably choose the best cross-sectional shape of the metal elements of mining transport vehicles, depending on the direction of the current loads. The requirements for metal construction, such as minimum metal consumption and (or) surface area, are taken into account. For rods working in tension or compression, the most rational is the square shape of the cross section. For bending elements, a rectangular section with a height/width ratio of two is best suited. These conclusions are drawn from considerations of the least metal consumption and the smallest surface area of the metal structure. Taking the proposed recommendations into account when designing the metal structures of mining transportation machines will allow us to obtain the lowest values of metal consumption, and, consequently, the cost of the machine with the required technical characteristics.

scholarly journals Studi Analitik Karakteristik Penampang Baja Profil-I

2020 ◽  
Vol 6 (1) ◽  
pp. 1-11
Author(s):  
Sabril Haris
Keyword(s):  
Cross Section ◽  
Shape Factor ◽  
Cross Sectional ◽  
Moment Capacity ◽  
Section Modulus ◽  
Plastic Modulus ◽  
Calculation Results ◽  
The Cross ◽  
Hot Rolled ◽  
Section Form

Paper ini menyajikan hasil studi analitik tentang besaran karakteristik penampang baja profil-I berupa modulus elastis (Sx) dan modulus plastis penampang (Zx). Faktor bentuk penampang, yang merupakan perbandingan nilai Zx terhadap Sx, merupakan besaran utama yang digunakan untuk menghitung kapasitas momen plastis penampang baja. Khusus untuk baja profil-I yang dibuat dengan metoda canai panas, pada bidang pertemuan antara bagian sayap dan bagian badan terdapat bagian penampang seperempat lingkaran cekung yang memberikan kontribusi untuk nilai total besaran karakteristik penampang. Dalam penelitian ini, besaran karakteristik penampang dihitung dan dianalisis dengan menggunakan besaran karakteristik penampang dasar persegi panjang dan lingkaran. Analisa hasil perhitungan menunjukkan bahwa bagian penampang seperempat lingkaran cekung tersebut memberikan kontribusi yang konsisten terhadap nilai luas, modulus elastis dan plastis penampang, yakni dalam rentang sebesar 1.0 – 4,7%. Dari hasil penelitian ini juga diperoleh bahwa faktor bentuk penampang untuk profil-I yang umum digunakan berada dalam rentang nilai 1,102 – 1,147. Perhitungan nilai faktor bentuk penampang dengan dan tanpa mengikutsertakan bagian penampang seperempat lingkaran cekung memberikan hasil yang hampir sama dengan selisih rata-rata sebesar 0,001. Modulus plastis penampang dapat dihitung dengan menggunakan formula sederhana yang diusulkan pada artikel ini dengan tingkat akurasi yang sangat baik dengan deviasi sebesar 1.2 %. Untuk semua jenis ukuran penampang profil-I, formula ini bisa digunakan untuk menghitung modulus plastis penampang secara lebih sederhana. This paper presents the results of an analytical study of the characteristics of the I-profile steel cross-section in the form of elastic modulus (Sx) and plastic section modulus (Zx). The shape factor of the section, which is defined as the ratio of the value of Zx to Sx, is the principal quantity used to calculate the plastic cross-section moment capacity. Specifically for I-profile steels made by the hot-rolled process, in the area of ​​the junction between the flange and the web, there is a concave cross-section that contributes to the total value of the section characteristic. In this study, the magnitude of the cross-sectional characteristics is calculated and analyzed using the magnitude of the basic cross-section characteristics of rectangles and circles. Analysis of the calculation results shows that the cross-section of the concave quarter circle provides a consistent contribution to the area, elastic and plastic section modulus, which is in the range of 1.0 - 4.7%. From the results of this study, it was also found that the shape factor for the I-profile commonly used is in the range of values ​​1.102 - 1.147. Calculation of the cross-section form factor values ​​with and without including the concave quarter circle gives results that are almost the same as the average difference of 0.001. The plastic modulus of the cross-section can be calculated using the simple formula proposed in this article with a very good degree of accuracy with a deviation of 1.2%. For all types of I-profile cross-section sizes, this formula can be used to calculate the plastic section modulus easily.

On the cross-sectional shape of the cellulose crystallites in the tunicate Halocynthia papillosa

1990 ◽  
Vol 48 (3) ◽  
pp. 566-567
Author(s):  
J.-F. Revol ◽  
Y. Van Daele ◽  
F. Gaill
Keyword(s):  
Contrast Imaging ◽  
Animal Kingdom ◽  
Bright Field ◽  
Field Mode ◽  
Cross Sectional ◽  
Ultrathin Sections ◽  
The Cross ◽  
Sectional Shape ◽  
Valonia Ventricosa ◽  
C Nmr

The only form of cellulose which could unequivocally be ascribed to the animal kingdom is the tunicin that occurs in the tests of the tunicates. Recently, high-resolution solid-state l3C NMR revealed that tunicin belongs to the Iβ form of cellulose as opposed to the Iα form found in Valonia and bacterial celluloses. The high perfection of the tunicin crystallites led us to study its crosssectional shape and to compare it with the shape of those in Valonia ventricosa (V.v.), the goal being to relate the cross-section of cellulose crystallites with the two allomorphs Iα and Iβ.In the present work the source of tunicin was the test of the ascidian Halocvnthia papillosa (H.p.). Diffraction contrast imaging in the bright field mode was applied on ultrathin sections of the V.v. cell wall and H.p. test with cellulose crystallites perpendicular to the plane of the sections. The electron microscope, a Philips 400T, was operated at 120 kV in a low intensity beam condition.

A Technique for Measuring the Cross-Sectional Axes of the Longissimus Dorsi Muscle and Fat Depth in Lambs1,2

1960 ◽  
Vol 19 (3) ◽  
pp. 803-809
Author(s):  
D. J. Matthews ◽  
R. A. Merkel ◽  
J. D. Wheat ◽  
R. F. Cox
Keyword(s):  
Longissimus Dorsi ◽  
Cross Sectional ◽  
Longissimus Dorsi Muscle ◽  
Dorsi Muscle ◽  
The Cross

Automated Diagonal Slice and View Solution for 3D Device Structure Analysis

2018 ◽  
Author(s):  
Sang Hoon Lee ◽  
Jeff Blackwood ◽  
Stacey Stone ◽  
Michael Schmidt ◽  
Mark Williamson ◽  
...  
Keyword(s):  
Cross Section ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Image Data ◽  
Planar Surface ◽  
Device Structure ◽  
Cross Sectional ◽  
Device Structures ◽  
The Cross ◽  
Planar Analysis

Abstract The cross-sectional and planar analysis of current generation 3D device structures can be analyzed using a single Focused Ion Beam (FIB) mill. This is achieved using a diagonal milling technique that exposes a multilayer planar surface as well as the cross-section. this provides image data allowing for an efficient method to monitor the fabrication process and find device design errors. This process saves tremendous sample-to-data time, decreasing it from days to hours while still providing precise defect and structure data.

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