Stress analysis of basic shapes of membrane structures

2020 ◽  
Author(s):  
Nela Freiherrova ◽  
Martin Krejsa
Keyword(s):  
Stress Analysis ◽  
Membrane Structures

Tensioned Membrane Structures in the Form of Egg Shape

2013 ◽  
Vol 405-408 ◽  
pp. 989-992 ◽  
Author(s):  
Mohd Syazwan Mohd Noor ◽  
Hooi Min Yee ◽  
Abdul Hamid Haslinda ◽  
Ong Chong Yong
Keyword(s):  
Computer Program ◽  
Stress Analysis ◽  
Membrane Structure ◽  
Membrane Surface ◽  
Surface Shape ◽  
Displacement Method ◽  
Membrane Structures ◽  
Long Span ◽  
Egg Shape

Tensioned membrane structures are pre-stressed membrane structures that are appropriate to be used for long span application. Tensioned membrane structures must depend on their shape and internal pre-stress alone to achieve stability and to carry the loads. Some of the largest stadiums, airports, convention halls and commercial places are tensioned membrane structures. It is essential to perform shape-finding analysis while dealing with tensioned membrane structures. In this study, shape-finding analysis is carried out using computer program for stress analysis which is based on theory of nonlinear displacement method. Shape-finding of membrane surface bordered by Egg has been investigated. In this study, the possibility of adopting the form of Egg as surface shape for tensioned membrane structure has been studied.

Electromechanical Modelling and Stress Analysis of RF-MEMS Capacitive Shunt Switch

2021 ◽  
Author(s):  
Gopichand Ch ◽  
Reshmi Maity ◽  
K. Srinivas ◽  
N.P. Maity ◽  
K. Girija Srav
Keyword(s):  
Residual Stress ◽  
Stress Analysis ◽  
Maximum Stress ◽  
Rf Mems ◽  
Stress Gradient ◽  
Membrane Structures ◽  
Mechanical Modelling ◽  
Calculation Results ◽  
Beam Thickness ◽  
Center Deflection

Abstract This paper presents the simulation and theoretically calculation results of a shunt switch with Electro-mechanical modelling and stress gradient characteristics. The analysis is done with three membrane structures such as plane beam, incorporated with and without perforations, and non-uniform meander type beam, these are simulated in the COMSOL Multi-physics tool. The various Modal analyses are carried out for different values of residual stress gradients such as different structures, materials, and beam thickness. These analyzes are described by the fact that higher stress gradient values ​​are undesirable for switching. By analysing all the results we have observed that the stress analysis for a shows that non-uniform meandered switch experiences maximum stress of 35.6 MPa, and center deflection of 0.06 MPa/μm, the deformations of the beam which is the least among the considered switches.

FORCE DISTRIBUTIONS AND STRESS ANALYSIS OF THE INTOR-CH SUPERCONDUCTING COIL

1984 ◽  
Vol 45 (C1) ◽  
pp. C1-901-C1-904 ◽  
Author(s):  
C. Marinucci ◽  
L. Palladino ◽  
G. Pasotti ◽  
M. V. Ricci ◽  
G. Vécsey
Keyword(s):  
Stress Analysis ◽  
Superconducting Coil

Scale transition models and X-ray stress analysis

2003 ◽  
Vol 100 (12) ◽  
pp. 1137-1149
Author(s):  
M. François
Keyword(s):  
Stress Analysis ◽  
X Ray ◽  
Scale Transition ◽  
Transition Models

Ultrastructural Changes of the Tissue Thromboplastin after Intravenous Injection in Rabbits

1978 ◽  
Vol 39 (01) ◽  
pp. 201-209 ◽  
Author(s):  
Hiroshi Hasegawa ◽  
Hiroshi Nagata ◽  
Makoto Murao
Keyword(s):  
Intravenous Injection ◽  
Vascular Endothelium ◽  
Model Experiment ◽  
Venous Return ◽  
Ultrastructural Changes ◽  
Membrane Structures ◽  
Tissue Thromboplastin ◽  
Short Time ◽  
Sheet Membrane

SummaryAttempts were made to demonstrate ultrastructural changes of the tissue thromboplastin after intravenous injection, as a model experiment on the pulmonary microthrombi formation induced by the tissue thromboplastin circulating from venous return.Concentrically arranged membrane structures of the injected thromboplastin disappeared in extremely short time after the injection of the thromboplastin in rabbits. The long sheet membrane of the injected thromboplastin was frequently seen as adhered to the vascular endothelium or to the surface of blood corpuscles. Furthermore, fibrin fibres were formed in contact with the long sheet membrane of the thromboplastin. Membrane structures were not found anywhere in the control rabbits.

Ultramicroscopic and Coagulation-Fibrinolytic Findings Induced by Tissue Thromboplastin

1979 ◽  
Author(s):  
H Nagata ◽  
T Seya ◽  
Y Oguma ◽  
M Yamauchi ◽  
T Murakoshi ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Hypercoagulable State ◽  
Membrane Structures ◽  
Transmission Electron ◽  
Single Sheet ◽  
Tissue Thromboplastin ◽  
Short Time

We have studied the ultrastructures of tissue thromboplastin (T.Tbp) to demonstrate how It changes during coagulation.[Materials and Methods] T.Tbp from lungs of rabbits was used for these studies. It was injected into ear veins of rabbits. Lungs were resected at several seconds, 10sec, 1 min, 5 min, 24 hrs or 48 hrs after the injection. They were examined by transmission electron microscope.[Results] Concentrically arranged membrane structures of the injected T.Tbp disappeared in extremely short time after the injection. 1 min after the injection, fibrin fibers were seen between single sheet of membrane and endothelial cells of capillaries. In the rabbit which had died suddenly after the injection of T.Tbp, multiple pulmonary thrombi made of fibrin and platelets were seen in capillaries. The endothelial cells of capillaries were destroyed and interstitial tissues were edematous.The hypercoagulable state was seen 10~30sec after the start of the injection, indicating the shortening of r of TEG. Then, it gradually returned the level before injection. Moreover, changes of the measurements of fibrinogen, antiplasmin and prekallikrein were also seen after the injection.

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