scholarly journals THE INFLUENCE OF THE SHAPE OF WORKING SURFACE OF STRAIGHTENING ROLLERS OF VERTICAL AND HORIZONTAL STRAIGHTENING MACHINES ON THE STATE OF RESIDUAL STRESSES IN RAILWAY RAIL – SECOND STAGE OF RESEARCHES

2020 ◽  
Vol 72 (1) ◽  
pp. 48-58
Keyword(s):  
Residual Stresses ◽  
Symmetry Axis ◽  
The State ◽  
Roll Pass ◽  
Distribution Maps ◽  
Second Stage ◽  
Working Surface ◽  
National Centre ◽  
Railway Rail

The paper presents the results of the second stage of work on the influence of the shape of straightening rollers on the state of residual stresses in rails, conducted as part of a project co-financed by the National Centre for Research and Development. The tests included numerical simulations of the rail straightening process using a new roll pass design of vertical and horizontal straightener rollers, determination of stress distribution maps in the rail after straightening in successive rollers of both straightening machines, as well as measurement of residual stresses in the rails after straightening operation in industrial conditions. The tests were carried out on R260 grade 60E1 rails. The reduction of tensile residual stresses in the centre of symmetry axis of the rail foot was obtained up to an average level of 32 MPa, i.e. by more than four times less in relation to the level achieved using traditional technology.

Análise da Estrutura Espacial do Sistema Administrativo do Estado do Espírito Santo

1977 ◽  
Vol 1 ◽  
pp. 47-77
Author(s):  
Liane Maria Monteiro ◽  
Marina Sant'Anna ◽  
Lucy A. R Freire
Keyword(s):  
Spatial Structure ◽  
Efficiency Index ◽  
The State ◽  
Administrative System ◽  
Espírito Santo ◽  
Spatial Efficiency ◽  
Second Stage ◽  
Third Stage ◽  
Espirito Santo

A spatial structure model for the administrative system of the State of Espirito Santo presenting maximum spatial efficienty, is the purpose of this study. Therefore, it was necessary to identify and evaluate the existing administrative structure and reformulate it relatively to the limits of each division. The methodology employed was developed through five different stages.The first one consisted in the identification of the spatial structure of tht administrative system of State of Espirito Santo. Thus, the politic-administrative poles of transmission of decision were indicated through a survey of all cities of the State, and the areas of influence of each commanding regional pole were determined through the matrices of functional subordination. The second stage involved an evaluation of the spatial efficiency of these regions through the efficiency index. The third stage comprised the elaboration of a new spatial structure for the administrative system of the State, considering the accessibility factor and the evaluation of the spatial efficiency of each new region. The fourth stage consisted in the determination of the administrative regionalization hich presented the best spatial efficiency index. Finally, the fifth stage included analysis on the elaborated regionalization.

DETERMINATION OF RESIDUAL STRESSES AND STRESS INTENSITY FACTORS BY REMOVING LOCAL MATERIAL

2017 ◽  
Vol 48 (4) ◽  
pp. 377-398
Author(s):  
Svyatoslav Igorevich Eleonskii ◽  
Igor Nikolaevich Odintsev ◽  
Vladimir Sergeevich Pisarev ◽  
Stanislav Mikhailovich Usov
Keyword(s):  
Stress Intensity ◽  
Residual Stresses ◽  
Stress Intensity Factors ◽  
Intensity Factors ◽  
Local Material

Effect of diamond burnishing parameters on the state of the processed surface layer of billets made of high-strength "30ХГСН2А-ВД" steel

2020 ◽  
pp. 82-86
Author(s):  
A.N. Shvetsov ◽  
D.L. Skuratov
Keyword(s):  
Surface Layer ◽  
Residual Stresses ◽  
Strain Hardening ◽  
Processing Speed ◽  
Synthetic Diamond ◽  
High Strength ◽  
The State ◽  
Diamond Burnishing

The influence of the burnishing force, tool radius, processing speed and feed on the distribution of circumferential and axial residual strses, microhardness and the depth of strain hardening in the surface layer when pr ssing of "30ХГСН2А-ВД" steel with synthetic diamond "ACB-1" is considered. Empirical dependencies determining these parameters are given. Keywords diamond burnishing, strain hardening depth, circumferential residual stresses, axial residual stresses, microhardness. [email protected], [email protected]

scholarly journals Steady State Response of Linear Time Invariant Systems Modeledby Multibond Graphs

2021 ◽  
Vol 11 (4) ◽  
pp. 1717
Author(s):  
Gilberto Gonzalez Avalos ◽  
Noe Barrera Gallegos ◽  
Gerardo Ayala-Jaimes ◽  
Aaron Padilla Garcia
Keyword(s):  
Steady State ◽  
Linear Time ◽  
Direct Determination ◽  
The State ◽  
Steady State Response ◽  
State Variables ◽  
Linear Time Invariant ◽  
State Response ◽  
Time Invariant

The direct determination of the steady state response for linear time invariant (LTI) systems modeled by multibond graphs is presented. Firstly, a multiport junction structure of a multibond graph in an integral causality assignment (MBGI) to get the state space of the system is introduced. By assigning a derivative causality to the multiport storage elements, the multibond graph in a derivative causality (MBGD) is proposed. Based on this MBGD, a theorem to obtain the steady state response is presented. Two case studies to get the steady state of the state variables are applied. Both cases are modeled by multibond graphs, and the symbolic determination of the steady state is obtained. The simulation results using the 20-SIM software are numerically verified.

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