Improving Methods of Assessment of a Stress State of Structures According to the Results of Coercive Measurements

2018 ◽  
Vol 284 ◽  
pp. 1332-1336
Author(s):  
N.L. Zaytsev
Keyword(s):  
Stress State ◽  
Strain State ◽  
Steel Structures ◽  
Stress Strain ◽  
Stress Strain State ◽  
Assessment Of Stress

At the present time the assessment of stress-strain state of steel structures uses the results of coercive measurements. However, the methods presented in various works are contradictory and not deprived of errors of a methodological nature, which may lead to erroneous conclusions. This article reveals the analysis of disadvantages of the known methods and proposes possible ways to eliminate these shortcomings.

scholarly journals To assessment of stress-strain state in rock continua

2020 ◽  
Vol 869 ◽  
pp. 072019
Author(s):  
Farkhadjan Adilov ◽  
Shakhnoza Makhmudova ◽  
Rustam Abirov ◽  
Elyor Toshmatov ◽  
Ikbal Maxmudova
Keyword(s):  
Strain State ◽  
Stress Strain ◽  
Stress Strain State ◽  
Assessment Of Stress

scholarly journals The stress-strain state of the foundation of various forms using the Kelvin equation

2015 ◽  
Vol 4 ◽  
pp. 4-6
Author(s):  
Pilyagin A.V.
Keyword(s):  
Stress State ◽  
Strain State ◽  
Ground Surface ◽  
Deep Foundations ◽  
Natural Basis ◽  
Stress Strain ◽  
Concentrated Force ◽  
Kelvin Equation ◽  
Large Depth ◽  
Stress Strain State

The article discusses the stress-strain state of Foundation of various forms. It is noted that for foundations on natural basis is traditionally used for the solution of Boussinesq (1885) about the force applied to the ground surface, i.сe. without taking into account the fact that the depth of the foundations, and the solution obtained Mindlin (1950) takes into account the fact that the depth of foundations, but does not consider the development of tensile stresses above the level of application of the load. The analysis of the Kelvin equation for concentrated force applied at an infinitely large depth. The analysis of the stress state of grounds for the buried foundations using solution of Kelvin indicates the possibility of its use in the case of the use of deep foundations.

scholarly journals DYNAMIC COMPRESSIBILITY OF BIRCH AT DIFFERENT TYPES OF STRESS-STRAINED STATE

2020 ◽  
Vol 82 (3) ◽  
pp. 269-282
Author(s):  
A.M. Bragov ◽  
A.K. Lomunov ◽  
T.N. Yuzhina
Keyword(s):  
Stress State ◽  
Strain State ◽  
Uniaxial Stress ◽  
Deformation Condition ◽  
Dynamic Tests ◽  
Stress Strain ◽  
Free Expansion ◽  
Noticeable Increase ◽  
Stress Strain State ◽  
Deformation Diagrams

The results of dynamic tests for compression across the fibers at room temperature of birch samples with air humidity are presented. Dynamic tests were carried out on a setup with a split Hopkinson bar according to the Kolsky method at a strain rate of ~2000 s–1. To assess the effect of the type of stress-strain state on the behavior of the material, in addition to specimens in the form of cylinders with its free expansion during loading (uniaxial stress state condition), specimens were tested in a rigid casing that prevents the radial expansion of the specimen (uniaxial deformation condition), as well as local compressive tests of rectangular board fragments. In the latter case, the material surrounding the loading zone plays the role of a compliant confining casing. In this case, a certain intermediate stress-strain state is realized in the sample. For these three types of stress-strain state, dynamic deformation diagrams were obtained with registration of additional loading cycles. Comparison of obtained deformation diagrams shows a significant effect of the type of stress-strain state on the behavior of the material under study. In the case of free expansion of the specimen in the radial direction, the absence of strain hardening is observed in the first loading cycle. In subsequent cycles, hardening is negligible. The deformation diagrams of specimens in the casing as well as board fragments are characterized by a noticeable increase in the modulus of the hardening branch with increasing deformation. In this case, it can be noted that the behavior of the material in the case of testing a piece of board is intermediate between the cases of uniaxial stress state and uniaxial strain state. Some mechanical characteristics of the material are determined using the diagrams obtained. The obtained experimental results can serve as the basis for the subsequent identification of the model of deformation and destruction of wood.

Indentation of the cylindrical shell in the elastoplastic half-space

2018 ◽  
Vol 13 (3) ◽  
pp. 47-51
Author(s):  
A.A. Filippov
Keyword(s):  
Cylindrical Shell ◽  
Stress State ◽  
Half Space ◽  
Safety Factor ◽  
Strain State ◽  
Fracture Criterion ◽  
Steel Shell ◽  
Stress Strain ◽  
Stress Strain State ◽  
Steel Cylindrical Shell

The article deals with the problem of pressing the steel cylindrical shell into the elastoplastic half-space having a cylindrical concavity. The calculation and analysis of the stress-strain state of the steel shell and elastoplastic half-space. Given the dependence of the shear half-space, the safety factor and stress state in steel shell from the force pushing the shell in the half-space. The calculations were carried out for three radii of concavities and two types of half-space materials. It was assumed that the elastoplastic half-space obeys the Mohr-Coulomb fracture criterion.

Stress State of Disk Tool Attachment Points on Tetrahedral Prisms between Axial Bits

2015 ◽  
Vol 770 ◽  
pp. 434-438 ◽  
Author(s):  
A.A. Khoreshok ◽  
L.E. Mametyev ◽  
A.Yu. Borisov ◽  
A.V. Vorobyov
Keyword(s):  
Stress State ◽  
Strain State ◽  
Stress Strain ◽  
Stress Strain State ◽  
Disk Tool ◽  
Working Bodies ◽  
Rock Faces

The paper presents results of simulation of stress-strain state of disk tools attachment points on tetrahedral prisms of working bodies of multipurpose roadheaders while cutting of coal and rock faces.

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