scholarly journals The influence of the thickness of the elastic spherical shell with liquid on its stress-strain state

2020 ◽  
Vol 99 (3) ◽  
pp. 34-43
Author(s):  
O. Sheptylevskyi
Keyword(s):  
Stress Intensity ◽  
Stress State ◽  
Spherical Shell ◽  
Shell Thickness ◽  
Strain State ◽  
Middle Surface ◽  
Excitation Pulse ◽  
Elastic Spherical Shell ◽  
Gas Cavity ◽  
Fluid Separation

Investigations of the dynamics of the system consisting of elastic spherical shell filled with ideal compressible fluid and gas cavity in the center of the system are presented in this paper. The excitation pulse-modulated source is introduced into the gas cavity in the center of the system. The effect of the shell thickness on its dynamics and the stress-state during the pulsations is investigated. The results for radial displacements changes of the middle surface, the thickness of the fluid separation from the shell, the stress intensity in the shell during its free pulsations are obtained. The comparison of calculations for the separation thickness in cases of free and partially fixed shell is carried out.

Stress Distribution in a Rotating Spherical Shell of Arbitrary Thickness

1961 ◽  
Vol 28 (1) ◽  
pp. 127-131 ◽  
Author(s):  
M. A. Goldberg ◽  
V. L. Salerno ◽  
M. A. Sadowsky
Keyword(s):  
Exact Solution ◽  
Stress Intensity ◽  
Stress Distribution ◽  
Spherical Shell ◽  
Maximum Stress ◽  
Elastic Spherical Shell ◽  
Arbitrary Thickness ◽  
Maximum Stress Intensity ◽  
Thickness Parameter

This paper contains an exact solution for the stress distribution in an elastic spherical shell rotating about a diametral axis. The surfaces of the shell are free of boundary tractions. The coefficients necessary to determine the stresses at any point have been calculated for eight values of a thickness parameter, α. Graphs of the maximum stress intensity as a function of α are presented.

scholarly journals Force parameters of metal deformation during sheet drawing

2020 ◽  
Vol 16 (6) ◽  
pp. 493-503
Author(s):  
Yury A. Morozov
Keyword(s):  
Stress State ◽  
Strain State ◽  
Sheet Material ◽  
Forming Force ◽  
High Quality ◽  
State Process ◽  
The Matrix ◽  
Metal Deformation ◽  
Volumetric Stress ◽  
Steady State Process

The aim of the work. The effect of the curvature of the rounding of torus surfaces during the formation of a cylindrical product (glass) is investigated, taking into account the plastic thinning of the deformable material at the end edges of the matrix and pressing punch. Methods. The existing scheme for determining the power parameters of sheet drawing is analyzed, based on the assumption of the implementation of some abstract stress state in the material; mainly conditional tensile strength. At the same time, the possibility of forming the product without destruction determines the obvious overestimation of the stress level. A mathematical model of the volumetric stress state of the metal is being developed, which makes it possible to assess the deformation and stress state during the formation of a cold-drawn product, i. e. the folding of the sheet blank along the end radius of the rounding of the pressing punch and the steady-state process of drawing the blank into the deformation zone with successive bending/straightening of the material along the edge of the matrix are considered. The level of radial stresses during folding and stretching of sheet material is estimated, taking into account its strain hardening and thinning, which determine the forming force. The obtained results will make it possible to simulate the stress-strain state of the metal during the development of sheet drawing technology: to establish the amount of thinning, to estimate the level of radial stresses in the formation of rounding of torus surfaces along the end edges of the matrix and the pressing punch, as well as to determine the power parameters of the formation, which will prevent the destruction of the pulled part, guaranteeing obtaining high-quality products and more accurately choosing the deforming equipment.

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.

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