scholarly journals Improving the design of the tunneling shield cutting working body

2021 ◽  
pp. 74-82
Author(s):  
Anton Letopolskii ◽  
Keyword(s):  
3D Modeling ◽  
Equivalent Stress ◽  
Strength Characteristics ◽  
Material Surface ◽  
Theoretical Studies ◽  
Solid State Method ◽  
Rotor Design ◽  
Software Product ◽  
Photorealistic Images ◽  
Tunneling Shield

Object of research. The article presents a variant of improving the design of the working body of the tunneling shield, namely, its cutting part. Research aims to confirm the performance of the proposed design using the method of solid 3D modeling in T-Flex CAD. Methodology. The working body of the tunneling shield has been improved by making changes to the design of the working surface of the rotor. Theoretical studies have been carried out to determine the strength characteristics of the proposed rotor design. The proposed rotor model was visualized using the T-Flex CAD software product. The advantages of the solid-state method of 3D modeling are that the mathematical model is endowed with the real physical properties of the object (weight, volume, material, surface area, etc.), and the technology of rapid prototyping allows you to get layouts of photorealistic images in the shortest possible time. Results and discussion. Based on the results of the data obtained in the course of theoretical studies, a comparative analysis of the strength characteristics of the basic and modernized models of the tunneling shield cutting working body was carried out. The studies carried out in T-Flex CAD have confirmed the functionality of the modernized design of the tunneling shield working body. An algorithm for calculating the strength characteristics of the proposed rotor design is presented. The algorithm is universal and can be used to calculate other designs of the tunneling shield working body. Conclusions. As a result of the research carried out, the strength characteristics of the rotor have been determined. Maximum values: displacement modulus – 2.875 · 10–5 m, equivalent stresses – 29.47 MPa, and safety factor for an equivalent stress is 9.446 · 106.

scholarly journals Design Improvement of Cutting Part in Tunneling Shield

2021 ◽  
Vol 346 ◽  
pp. 03014
Author(s):  
Anton Letopolsky ◽  
Pavel Korchagin ◽  
Irina Teterina
Keyword(s):  
Strength Characteristics ◽  
Theoretical Research ◽  
Working Capacity ◽  
Equivalent Stresses ◽  
Rotor Design ◽  
Working Surface ◽  
Improved Design ◽  
Improved Model ◽  
Rotor Model ◽  
Tunneling Shield

The article presents a variant for improving the design of a working body of a tunneling shield, its cutting part to be more precise. The working body of the tunneling shield has been improved with the changes in the design of a rotor working surface. The theoretical studies aimed at determining the strength characteristics of the proposed rotor design have been carried out. The proposed rotor model has been visualized with the use of the T-Flex CAD software. On the basis of the results obtained in the course of the theoretical research, a comparative analysis of the strength characteristics of the main and improved model of the cutting working body of the tunneling shield have been made. The studies carried out at T-Flex CAD confirmed the working capacity of the improved design of the tunneling shield working body. The strength of the rotor has been determined as a result of the studies carried out. The maximum values of the displacement module is 2.875E-05 m, the equivalent stresses are 29.47 MPa, a reserve coefficient on equivalent stresses is 9.446E 06.

scholarly journals Analysis of the dependence of the stressed state of the tracked track of a career excavator from an angle slope

2020 ◽  
Vol 177 ◽  
pp. 03015
Author(s):  
Maxim Rakhutin ◽  
Navarrete Simba ◽  
Sergey Khoroshavin
Keyword(s):  
Stressed State ◽  
3D Modeling ◽  
Equivalent Stress ◽  
Slope Angle ◽  
Three Dimensional ◽  
Stress And Strain ◽  
Direct Proportion ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Caterpillar Track

Conducted static research and determined the strength characteristics of the loaded three-dimensional model of the caterpillar track when working at different slope angles. The parameters were calculated in the 3D modeling system “SolidWorks”. As a result of research, it was found that with an increase in the slope angle, the values of the static equivalent stress and strain in the caterpillar track increase in direct proportion, while the value of the safety factor decreases accordingly.

STUDY OF THE STRENGTH CHARACTERISTICS OF THE PAW WORKING BODY WITH A VARIABLE ANGLE OF CRUMBLING

2020 ◽  
Author(s):  
T.P. Savostina ◽  
◽  
N.A. Shchipelev ◽  
A.S. Karachevsky
Keyword(s):  
Stress State ◽  
Computer Model ◽  
3D Modeling ◽  
Strength Characteristics ◽  
Variable Angle

This article is devoted to research in the field of determining the main strength characteristics of a pointed leg working organ with a variable angle of crumbling. The peculiarity of the presented material is the study of changes in the stress state in the characteristic sections of the paw working organ. All calculations were performed on the created computer model of the paw using 3D modeling. Further, the results of strength calculations of the lamp under study were compared with the results obtained during the study of the traditionally used paw.

scholarly journals A Comparative study of durability property on compact tension specimen with unique CFRP and inhomogeneous iron through analysis

2018 ◽  
Vol 7 (2.12) ◽  
pp. 271
Author(s):  
Jung Ho Lee ◽  
Jae Ung Cho
Keyword(s):  
Stainless Steel ◽  
Strength Characteristic ◽  
Equivalent Stress ◽  
Compact Tension ◽  
Compact Tension Specimen ◽  
Inhomogeneous Material ◽  
Strength Characteristics ◽  
Material Strength ◽  
Tension Specimen ◽  
Maximum Deformation

Most damage of mechanical structures is due to cracks within the structure. This study is to develop the design of safer structures with strength characteristics by material. We have performed 3D modeling for compact tension specimen such as CFRP material, stainless steel and aluminum alloy, and stainless steel and copper alloy as inhomogeneous material. The boundary conditions are applied to each CFRP and compact tension specimen model with inhomogeneous material and the identical conditions are also applied to each specimen model. The simulation tension analysis has been carried for this study to investigate the strength characteristic. The inhomogeneous material in mechanical structure can be maximized with durability and material strength combined with the advantages of each metal. The material used for these mechanical structures is an essential factor. CFRP made of carbon fiber has been received the attention for a high level of durability and lightweight characteristics. If we apply CFRP material to mechanical structures, we may reduce deformation and stress that occurs, maximize durability of mechanical structures, and prevent deformation and damage. Comparing each specimen model, we can consider the CFRP compact tension specimen model to be the most suitable material for real application as its maximum deformation and maximum equivalent stress turned out to be lower than the other inhomogeneous material specimen models. We could find out that although it is a single material, it possesses a stronger durability and strength characteristic compared to inhomogeneous material combined with the advantages of each material. In this study, the durability and strength characteristics of specimen models are thought to be improved by applying simulation analysis after designing compact tension models for each material.  

scholarly journals Intergraph SmartPlant 3D Comparative analysis of tie-in calculations for the pipeline at the designed CDU/VDU complex of the Omsk refinery based on 3D modeling

2019 ◽  
pp. 58-66
Author(s):  
Igor N. Kvasov ◽  
Michael A. Aleksandrov ◽  
Andrey V. Zanin ◽  
Maria Yu. Zemenkova
Keyword(s):  
Comparative Analysis ◽  
3D Modeling ◽  
3D Model ◽  
Main Line ◽  
Software Products ◽  
Specialized Software ◽  
Software Product ◽  
Actual Design

The article is devoted to the problem of strength loads when inserting a branch into the main line. We have carried out the calculations in manual form and with the help of a domestic software product START, specializing in pipeline calculations. 3D model of pipelines was designed to solve the problem and 3D model visualized using software product the Intergraph SmartPlant 3D. The results obtained in the development of the model made it possible to establish the most optimal characteristics of the pipeline tie-in for strength loads and to identify the need to use reinforcement of this tie-in. In the course of the research we have studied significant aspects of strength calculations, as well as features of usage of specialized software products. The calculation was used in the actual design of the CDU/VDU complex of the Omsk refinery.

Suppression of γ’ Precipitation in a Laser-Melted Nickel-Base Alloy

1977 ◽  
Vol 35 ◽  
pp. 270-271
Author(s):  
J. M. Walsh ◽  
J. C. Whittles ◽  
B. H. Kear ◽  
E. M. Breinan
Keyword(s):  
Cooling Rate ◽  
Base Alloy ◽  
Material Surface ◽  
Intimate Contact ◽  
Absorbed Power ◽  
Perfect Contact ◽  
Nickel Base ◽  
Rapidly Solidified ◽  
Limiting Case ◽  
The Heat Transfer Coefficient

Conventionally cast γ’ precipitation hardened nickel-base superalloys possess well-defined dendritic structures and normally exhibit pronounced segregation. Splat quenched, or rapidly solidified alloys, on the other hand, show little or no evidence for phase decomposition and markedly reduced segregation. In what follows, it is shown that comparable results have been obtained in superalloys processed by the LASERGLAZE™ method.In laser glazing, a sharply focused laser beam is traversed across the material surface at a rate that induces surface localized melting, while avoiding significant surface vaporization. Under these conditions, computations of the average cooling rate can be made with confidence, since intimate contact between the melt and the self-substrate ensures that the heat transfer coefficient is reproducibly constant (h=∞ for perfect contact) in contrast to the variable h characteristic of splat quenching. Results of such computations for pure nickel are presented in Fig. 1, which shows that there is a maximum cooling rate for a given absorbed power density, corresponding to the limiting case in which melt depth approaches zero.

Microstructures of Laser Processed Fe-Cr Surface Alloys

1981 ◽  
Vol 39 ◽  
pp. 328-329
Author(s):  
P. A. Molian ◽  
K. H. Khan ◽  
W. E. Wood
Keyword(s):  
Cooling Rate ◽  
Pure Iron ◽  
Continuous Wave ◽  
Laser Surface ◽  
Material Surface ◽  
Constitution Diagram ◽  
Incident Power ◽  
Surface Alloying ◽  
Laser Surface Alloying ◽  
Spot Diameter

In recent years, the effects of chromium on the transformation characteristics of pure iron and the structures produced thereby have been extensively studied as a function of cooling rate. In this paper, we present TEM observations made on specimens of Fe-10% Cr and Fe-20% Cr alloys produced through laser surface alloying process with an estimated cooling rate of 8.8 x 104°C/sec. These two chromium levels were selected in order to study their phase transformation characteristics which are dissimilar in the two cases as predicted by the constitution diagram. Pure iron (C<0.01%, Si<0.01%, Mn<0.01%, S=0.003%, P=0.008%) was electrodeposited with chromium to the thicknesses of 40 and 70μm and then vacuum degassed at 400°F to remove the hydrogen formed during electroplating. Laser surface alloying of chromium into the iron substrate was then performed employing a continuous wave CO2 laser operated at an incident power of 1200 watts. The laser beam, defocussed to a spot diameter of 0.25mm, scanned the material surface at a rate of 30mm/sec, (70 ipm).

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