scholarly journals Assessment of the possibility of using mobile bridges to overcome man-made structures by specialized multi–axle wheeled vehicles

2021 ◽  
Vol 7 (3) ◽  
pp. 296-301
Author(s):  
S.L. Tropin ◽  
◽  
A.N. Misinev ◽  
S.G. Gnezdilov ◽  
◽  
...  
Keyword(s):  
Stress State ◽  
Specific Problem ◽  
Structural Mechanics ◽  
General Information ◽  
Equivalent Stresses ◽  
Double Support ◽  
First Approximation ◽  
Wheeled Vehicles

The article provides general information about double-support mobile bridges designed for contactless movement of heavily loaded specialized multi-axle wheeled vehicles on top of man–made structures. Also, recommendations are given on substantiating the possibility of their use for solving specific problems. These recommendations contain expressions obtained by the methods of structural mechanics, on the basis of which it is possible to determine not only the required (minimum) camber of the mobile bridge, which is necessary to ensure the normal passage of the vehicle, but also to assess the stress state of the mobile bridge, as well as to determine the nature of the deformation of the mobile bridge when vehicle moves along it. The presented recommendations allow, at a first approximation, to assess the suitability of the available solutions of a mobile bridge for the passage of specialized multi-axle vehicles over mane–made structures, depending on the required span of the mobile bridge and the load from the vehicle on the mobile bridge. The article also provides an example of solving a specific problem on the basis of these recommendations, in accordance with which, when a mobile bridge is spanned 23.4 m and a working load from one axis of the vehicle is equal to 33.5 tons, the required camber is 400 mm, and the highest equivalent stresses will be about 380 MPa.

Ein Kommentar zum mehrachsigen Spannungszustand im reibungsfrei überrollten Kontakt elastischer Körper und zur Anwendung von Vergleichsspannungshypothesen

2021 ◽  
Vol 68 (2) ◽  
Author(s):  
Michael Jüttner ◽  
Stephan Tremmel ◽  
Martin Correns ◽  
Sandro Wartzack
Keyword(s):  
Stress State ◽  
Axial Stress ◽  
Equivalent Stress ◽  
Rolling Contact ◽  
Hertzian Contact ◽  
Stress History ◽  
Equivalent Stresses

For the assessment of a rolling contact, knowledge about the inhomogeneous multi-axial stress state as well as the limitations of available equivalent stress hypotheses are important. Therefore, this paper examines the multi-axial stress state using the example of the HERTZian contact ball/plane in order to derive the stress history for the frictionless rolling contact. Finally, the oppor tunities and limitations of the use of equivalent stresses are shown using the maximum distortion criterion as an example.

scholarly journals Stress-strain state of metal in deformation zone during production of steel section billets on the unit of combined continuous casting and deformation. Report 2

2020 ◽  
Vol 63 (9) ◽  
pp. 730-734
Author(s):  
O. S. Lekhov ◽  
A. V. Mikhalev
Keyword(s):  
Stress State ◽  
Continuous Casting ◽  
Cross Sections ◽  
Deformation Zone ◽  
Cast Slab ◽  
Equivalent Stresses ◽  
Steel Slab ◽  
Characteristic Lines ◽  
Continuously Cast ◽  
Steel Section

Stress state of metal in deformation zone during introduction of the separating collars of the grooved die into continuously casted steel slab was calculated for production of section billets on the unit of combined continuous casting and deformation. Calculation of axial, tangential and equivalent stresses arising in deformation zone of metal was made in four sections of deformation zone and its results are presented in specific points and lines. View of the section of deformation zone and location of specific points are provided. The stress state of metal in zone of cyclic deformation at formation of three steel section billets from continuously cast slab by separating collars of grooved die on the unit of combined continuous casting and deformation was determined by solving extensive problem of elasticity with the finite element method using the ANSYS package. The results of calculation of axial, tangential and equivalent stresses according to Mises in deformation zone are given in form of graphs and tables for working surfaces in four cross sections. The values and regularities of distribution of these stresses along the length and width of deformation zone were determined. The character of axial stresses distribution by characteristic lines located along the length of deformation zone is shown. Values of the highest compressive and tensile axial stresses arising in deformation zone during introduction of separating collars of grooved were obtained for the unit of combined continuous casting and deformation.

Model of Equal-Stressed Cylinder Based on the Mohr Failure Criterion

2014 ◽  
Vol 887-888 ◽  
pp. 869-872 ◽  
Author(s):  
Vladimir I. Andreev ◽  
Anton S. Chepurnenko ◽  
Batyr M. Jazyev
Keyword(s):  
Stress State ◽  
Internal Pressure ◽  
Plane Strain ◽  
Plane Stress ◽  
Failure Criterion ◽  
Strain State ◽  
Elasticity Modulus ◽  
Plane Stress State ◽  
Analytical Dependence ◽  
Equivalent Stresses

In this article, an analytical dependence of distribution of elasticity modulus across the thickness of the cylinder loaded with internal pressure p, at which the equivalent stresses according the Mohr failure criterion are the same at all points. The problem is solved for the cases of plane strain state and plane stress state in the elastic formulation.

scholarly journals Experimental Study on Structural Mechanics of Asphalt Pavement by Digital Speckle Correlation Methods

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Hailiang Xu ◽  
Hehuan Ren ◽  
Jining Qin ◽  
Xu Guo
Keyword(s):  
Stress State ◽  
Asphalt Pavement ◽  
Correlation Method ◽  
Structural Mechanics ◽  
Digital Speckle Correlation Method ◽  
Speckle Correlation ◽  
Correlation Methods ◽  
Digital Speckle ◽  
Pavement Structure ◽  
Digital Speckle Correlation

The experiments on the structural mechanics of asphalt pavement were carried out by the digital speckle correlation method (DSCM). The digital speckle correlation method is used to collect experimental data. The displacement and strain values of each layer of the asphalt pavement structure are analyzed. The research showed that (1) the digital speckle correlation methods could accurately observe the displacement value and the strain value of the pavement structure. (2) The stress state of the pavement structure was greatly influenced by the interlayer effect. The vertical displacement changed suddenly between layers. The concentration phenomenon of the tension-compression strain and the shear strain appeared between layers. (3) The overloading situation seriously worsened the overall stress state of the pavement structure, especially at the bottom of the asphalt top layer and lower layer and at the top of the cement-stabilized crushed stone. The research results are of great significance to the structural design of heavy-duty roads.

First approximation of the zero-stress state of arterial wall and contraction of SMC

2006 ◽  
Vol 39 ◽  
pp. S325
Author(s):  
G.-Q Wu ◽  
L. Wang ◽  
J.-B. Xin ◽  
W.-Z. Lin
Keyword(s):  
Stress State ◽  
Arterial Wall ◽  
First Approximation

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.

Psychological literacy: A first approximation.

1990 ◽  
Vol 45 (7) ◽  
pp. 891-900 ◽  
Author(s):  
C. Alan Boneau
Keyword(s):  
First Approximation
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