Damping characteristics of the architectural coated fabric and its influence on the vibration response of membrane structures

2022 ◽  
pp. 115207
Author(s):  
Junhao Xu ◽  
Yingying Zhang ◽  
Meng Wu ◽  
Xiaocheng Li ◽  
Lanlan Zhang
Keyword(s):  
Vibration Response ◽  
Membrane Structures ◽  
Damping Characteristics ◽  
Coated Fabric

scholarly journals Free vibration and inherent material damping characteristics of boron-FRP plate: influence of non-uniform uniaxial edge loads

2021 ◽  
Vol 12 ◽  
pp. 18
Author(s):  
Vijay Gunasekaran ◽  
Jeyaraj Pitchaimani ◽  
Lenin Babu Mailan Chinnapandi
Keyword(s):  
Free Vibration ◽  
Strain Energy ◽  
Analytical Investigation ◽  
Vibration Response ◽  
Buckling Load ◽  
Material Damping ◽  
Damping Characteristics ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Free Vibration Response

The current investigation presents the analytical investigation on free vibration and inherent material damping of boron-FRP plate, subjected to non-uniform uniaxial edge loads. Initially critical buckling load (Pcr) is obtained, then followed by free vibration response and inherent material damping values for corresponding modal indices of the FRP plate is calculated for different load fraction of non-uniform uniaxial edge loads. The buckling load and free vibration response are obtained by using strain energy method and Reddy's TSDT respectively. It is observed that the nature of load and aspect ratio influence the bucking, free vibration and inherent material damping behaviour of the fibre reinforced polymer plate significantly.

scholarly journals Experimental and Theoretical Research on the Stress-Relaxation Behaviors of PTFE Coated Fabrics under Different Temperatures

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Yingying Zhang ◽  
Shanshan Xu ◽  
Qilin Zhang ◽  
Yi Zhou
Keyword(s):  
Stress Relaxation ◽  
Process Analysis ◽  
Theoretical Research ◽  
Good Prediction ◽  
Construction Process ◽  
Membrane Structures ◽  
Coated Fabric ◽  
Different Temperatures ◽  
C 50 ◽  
Coated Fabrics

As polymer composites, the stress-relaxation behaviors of membrane materials have significant effects on the pattern cutting design, the construction process analysis, and the stiffness degradation of membrane structures in the life cycle. In this paper, PTFE coated fabric is taken as the research object. First, the stress-relaxation behaviors under different temperatures (23°C, 40°C, 50°C, 60°C, and 70°C) are studied, and the variations of main mechanical parameters are got. Then, a simple review of several current viscoelastic models is presented. Finally, several common models for the material viscoelasticity are used to compare with the test results. Results show PTFE coated fabric is typically viscoelastic. The stress relaxation is obvious in the initial phase and it decreases with time increasing. The stress decreases significantly and then tends to a stable value. With temperature increasing, the decrease rate of membrane stress decreases and the final stable value increases. This material performs obvious hardening with temperature increasing. Most of the current models can make good prediction on the stress-relaxation behaviors of PTFE coated fabrics under different temperatures. The results can be references for the determination of pattern shrinkage ratio and construction process analysis of membrane structures.

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.

Vibration Response Imaging (VRI) bei Quarzstaubbedingten Lungenveränderungen

Pneumologie ◽  
2007 ◽  
Vol 61 (S 1) ◽  
Author(s):  
F Hoffmeyer ◽  
V Harth ◽  
J Bünger ◽  
J Henry ◽  
A Dehlinger ◽  
...  
Keyword(s):  
Vibration Response ◽  
Vibration Response Imaging

Vibration Response Imaging (VRI) bei der Anwendung in einer internistischen Allgemeinpraxis – eine Machbarkeitsstudie

Pneumologie ◽  
2008 ◽  
Vol 62 (S 2) ◽  
Author(s):  
HD Becker ◽  
M Gat ◽  
S Thiemann
Keyword(s):  
Vibration Response ◽  
Vibration Response Imaging

96. Computer Keyboard Keys: Stiffness and Damping Characteristics

2001 ◽  
Author(s):  
R. Marklin ◽  
M. Nagurka
Keyword(s):  
Damping Characteristics ◽  
Computer Keyboard ◽  
Stiffness And Damping

A new approach to wrinkling prediction for space membrane structures

2001 ◽  
Author(s):  
B. Yang ◽  
H. Ding ◽  
M. Lou ◽  
H. Fang
Keyword(s):  
Membrane Structures ◽  
New Approach
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