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 RESEARCH OF THE AUTOMATED DYNAMIC RECONFIGURABLE PANEL

2020 ◽  
pp. 75-77
Author(s):  
P. A. Chemogonov ◽  
A. M. Makarov ◽  
N. G. Sharonov ◽  
A. V. Ivchenko
Keyword(s):  
Computer Model ◽  
Weight Reduction ◽  
Strength Characteristics ◽  
Computer Research ◽  
Rational Shape

A computer model of a fragment of an automated dynamic reconfigurable panel is being developed and researched. The stresses, displacements, and deformations arising at various loads are investigated. The results of computer research allow you to choose a rational shape and configuration of the panel, which leads to an increase in its strength characteristics and weight reduction.

STUDY OF THE FEATURES OF STRENGTH CALCULATION OF CULTIVATOR WORKING BODIES EQUIPPED WITH POINTED LEGS

2020 ◽  
Author(s):  
A.G. Diachenko ◽  
◽  
A.S. Karachevsky ◽  
N.A. Shchipelev
Keyword(s):  
Stress State ◽  
Working Conditions ◽  
Cross Sections ◽  
Cross Sectional Area ◽  
Strength Characteristics ◽  
Sectional Area ◽  
Cross Sectional ◽  
A Value ◽  
Working Bodies ◽  
Basic Strength

The materials of this article are devoted to research on determining the main strength characteristics of the pointed leg working body, the main difference between which and the traditionally used ones is the variable angle of crumbling. The purpose of this article was to determine the basic strength characteristics in typical cross sections ploskorezy Lancet paws, as well as identifying the degree of influence of cross-sectional dimensions of racks for efficiency. the features include the study of changes in the stress state occurring in the paw working organ in its characteristic sections, and as a consequence, the effect of these changes on the rigid rack. Modeling of working bodies and the most important working conditions, as well as calculations were performed using the "APM Win Machine" package. As a result of the conducted research, it was found that large stresses are obtained at the place of attachment of the paw to the rack and reach 193.4 MPa, and with a decrease in the cross-sectional area of the rack, its strength characteristics correspondingly decreased to a value of 85.3 MPa.

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 Analysis of the stress state of the ribbed-ring metal dome under different methods of installation

2021 ◽  
Vol 263 ◽  
pp. 02046
Author(s):  
Evgeny Lebed
Keyword(s):  
Stress State ◽  
Computer Model ◽  
Computer Models ◽  
The Self ◽  
Design Model ◽  
Design Scheme ◽  
Computer Calculations ◽  
Central Support ◽  
The Impact

A computer model of the frame of a ribbed-ring metal dome of steel I-beams with a span of 30,3 m and a height of 7,5 m with rigid connections at the joints have been developed. Based on the design scheme, auxiliary models of a partially complete dome frameworks were designed to study alternative installation methods, which differ from each other in the location scheme of temporary supports with hinge joints of bar elements over them. The installation computer models utilized the three schemes of temporary supports: central support, central support and 1 circular row of intermediate supports, central support and 3 circular rows of intermediate supports. Computer calculations were performed for the design model of the dome framework and for all installation models to evaluate the impact of the self-weight of the dome on the stress state of the elements of its framework. As a result of the research, graphs and diagrams were created, which reflect the level of installation stresses in the meridional ribs in comparison with their values in the design scheme. The necessity to perform calculations of the dome frameworks during the design according to the installation conditions is noted.

Undrained Shear Strength Characteristics of Natural Silty Clay

2013 ◽  
Vol 405-408 ◽  
pp. 285-289
Author(s):  
Jie Yin ◽  
Yong Hong Miao
Keyword(s):  
Shear Strength ◽  
Stress State ◽  
Water Content ◽  
Yield Stress ◽  
Undrained Shear Strength ◽  
Strength Characteristics ◽  
Silty Clay ◽  
Undisturbed Samples ◽  
Undisturbed Sample ◽  
Undrained Shear

Triaxial consolidation undrained shear tests were carried out on both undisturbed and reconstituted samples of natural silty clay to investigate their undrained shear strength characteristics. Test results suggest that the strength envelope of the undisturbed sample is composed by two straight lines, which is different from that of the strength envelopes of reconstituted samples showing a straight line through the origin. Undrained shear strength of undisturbed samples are larger than corresponding reconstituted samples due to the resistance of soil structure in the pre-yield stress state. In the post-yield stress state, however, strength envelope of the undisturbed sample lies among the reconstituted samples with different initial water contents. Undrained shear strength for undisturbed samples in the post-yield stress state and reconstituted samples can be well correlated with the water content under different confining stress, which implies that undrained shear strength mainly depends on the current water content.

Quantitative defect studies in semiconductor TEM samples prepared by low angle ion milling

1995 ◽  
Vol 53 ◽  
pp. 512-513
Author(s):  
L. Mulestagno ◽  
J.C. Holzer ◽  
P. Fraundorf
Keyword(s):  
Sample Preparation ◽  
Milling Time ◽  
High Density ◽  
Low Density ◽  
Ion Milling ◽  
High Quality ◽  
Variable Angle ◽  
Major Disadvantage ◽  
Induced Defects

Due to the wealth of information, both analytical and structural that can be obtained from it TEM always has been a favorite tool for the analysis of process-induced defects in semiconductor wafers. The only major disadvantage has always been, that the volume under study in the TEM is relatively small, making it difficult to locate low density defects, and sample preparation is a somewhat lengthy procedure. This problem has been somewhat alleviated by the availability of efficient low angle milling.Using a PIPS® variable angle ion -mill, manufactured by Gatan, we have been consistently obtaining planar specimens with a high quality thin area in excess of 5 × 104 μm2 in about half an hour (milling time), which has made it possible to locate defects at lower densities, or, for defects of relatively high density, obtain information which is statistically more significant (table 1).

1593: Computer Model to Predict Patency Outcome after Vasoepididymostomy

2004 ◽  
Vol 171 (4S) ◽  
pp. 420-420
Author(s):  
Sijo J. Parekattil ◽  
Paul Shin ◽  
Anthony J. Thomas ◽  
Ashok Agarwal
Keyword(s):  
Computer Model

Short Stress State Questionnaire

2015 ◽  
Vol 31 (1) ◽  
pp. 20-30 ◽  
Author(s):  
William S. Helton ◽  
Katharina Näswall
Keyword(s):  
Stress State ◽  
Factor Structure ◽  
Human Performance ◽  
Self Report ◽  
Confirmatory Factor ◽  
Stress States ◽  
Related Stress ◽  
Using Data ◽  
Task Conditions ◽  
Multiple Samples

Conscious appraisals of stress, or stress states, are an important aspect of human performance. This article presents evidence supporting the validity and measurement characteristics of a short multidimensional self-report measure of stress state, the Short Stress State Questionnaire (SSSQ; Helton, 2004 ). The SSSQ measures task engagement, distress, and worry. A confirmatory factor analysis of the SSSQ using data pooled from multiple samples suggests the SSSQ does have a three factor structure and post-task changes are not due to changes in factor structure, but to mean level changes (state changes). In addition, the SSSQ demonstrates sensitivity to task stressors in line with hypotheses. Different task conditions elicited unique patterns of stress state on the three factors of the SSSQ in line with prior predictions. The 24-item SSSQ is a valid measure of stress state which may be useful to researchers interested in conscious appraisals of task-related stress.

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