scholarly journals APPROBATION OF THE NUMERICAL METHOD OF CALCULATING THE DYNAMIC STRESS-STRAIN STATE OF THE THREE-DIMENSIONAL SYSTEM “FOUNDATION – FACILITY OF THE PRESSURE FRONT HYDRAULIC ENGINEERING STRUCTURE – WATER RESERVOIR” ON THE EXAMPLE OF THE CLUSTER-REGULATOR

2018 ◽  
Vol 14 (1) ◽  
pp. 26-35
Author(s):  
Dmitry S. Dmitriev
Keyword(s):  
Strain State ◽  
Dynamic Stress ◽  
Three Dimensional ◽  
Water Reservoir ◽  
Pressure Head ◽  
Dimensional System ◽  
Seismic Action ◽  
Stress Strain ◽  
Stress Strain State ◽  
Three Dimensional System

In the article, the results of approbation of the developed technique of the refined numerical simula-tion of the dynamic stress-strain state of the three-dimensional system “ground base (earth foundation) – reser-voir – construction of the pressure head of the hydraulic system” under seismic influences. A comparison is made between two different ways of modeling the fluid interacting with the structure and the base of the hydroe-lectric power station. The issues of choosing the dimensions of the base unit and taking into account the inertial load from it, as well as the method of determining the initial seismic action, are touched upon.

scholarly journals Stress-strain state of a composite near rectangular inclusion

2018 ◽  
Vol 243 ◽  
pp. 00021
Author(s):  
Pavel Pisarev ◽  
Aleksandr Anoshkin ◽  
Vladislav Ashihmin
Keyword(s):  
Numerical Simulations ◽  
Numerical Experiments ◽  
Strain State ◽  
Maximum Stress ◽  
Three Dimensional ◽  
Thermoplastic Composite ◽  
Model Construction ◽  
Stress Strain ◽  
Stress Strain State ◽  
Rectangular Inclusion

In this research we developed a technique for calculating the stress-strain state of a model construction from a thermoplastic composite material with an embedded piezoactuator. Numerical simulations of the model construction stress-strain state with different arrangement of piezoactuators: upper and middle,-were performed. Numerical simulations were carried out in a three-dimensional setting taking into account the complete technological scheme of laying and anisotropy of the properties of reinforcing layers. The results of numerical experiments revealed the areas of maximum stress. Recommendations for the MFC’s embedding into composite materials were formulated.

scholarly journals Dynamic stress-strain state of a single-section manipulator

2017 ◽  
Vol 87 (3) ◽  
pp. 27-32
Author(s):  
E. Arinov ◽  
◽  
S.Zh. Karipbaev ◽  
K.Z. Sartayev ◽  
◽  
...  
Keyword(s):  
Strain State ◽  
Dynamic Stress ◽  
Stress Strain ◽  
Stress Strain State ◽  
Single Section

scholarly journals Stress-strain state of a three-layer cylindrical shell under internal axisymmetric pulse load

2020 ◽  
pp. 145-151
Author(s):  
Viktor Gaidaichuk ◽  
Kostiantyn Kotenko
Keyword(s):  
Finite Element ◽  
Cylindrical Shell ◽  
Strain State ◽  
Layer Structure ◽  
Three Dimensional ◽  
Pulse Load ◽  
Geometrical Parameters ◽  
Time Interval ◽  
Stress Strain ◽  
Stress Strain State

The problem of dynamic deformation of a three-layer cylindrical shell under non-stationary loads in the case of rigid clamping of the shell ends is considered. The article presents the results of assessing the stress-strain state of a three-layer cylindrical shell, taking into account its structural feature, the ratio of the sheathing thickness and the physical and mechanical characteristics of a one-piece polymer filler. Calculations were performed by software complex Nastran. The values of displacements and stresses were calculated by the algorithm of direct transient dynamic process. The step duration of the time interval was 0.0000025 s, and the total number of steps was 200. The choice of the type of three-dimensional finite element was due to obtaining more detailed and accurate calculation results. The finite element model included 19000 three-dimensional finite elements and numbered 20800 nodes. The influence of geometrical parameters of shell layers with different physical and mechanical properties of one-piece filler on the stress-strain state under axisymmetric internal impulse load is investigated. Numerical results on the dynamics of the three-layer structure, obtained by the finite element method, allow to characterize the stress-strain state of the three-layer elastic structure of the cylindrical type at any time in the studied time interval. Optimization of the shell design is recommended. Changing the ratio of the thickness of the internal and external shells of the shell significantly affects the stress-strain state of the shell and its performance. Increasing the thickness of the internal layer of the shell significantly contributes to the increase of the latter. Comparison of the given results with materials of other similar researches and positions, testify to objectivity of the made approach.

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