Experimental study on the damping properties of NBR-based viscoelastic materials enhanced by minimal particles

2021 ◽  
Author(s):  
Yi Su ◽  
Fengqi Wang ◽  
Shengjing Zong ◽  
Yanyan Liu
Keyword(s):  
Experimental Study ◽  
Damping Properties ◽  
Viscoelastic Materials

The growth and collapse of cavitation bubbles near composite surfaces

1989 ◽  
Vol 203 ◽  
pp. 199-214 ◽  
Author(s):  
A. Shima ◽  
Y. Tomita ◽  
D. C. Gibson ◽  
J. R. Blake
Keyword(s):  
Experimental Study ◽  
Bubble Size ◽  
The State ◽  
Bubble Collapse ◽  
Viscoelastic Materials ◽  
Effective Parameters ◽  
Composite Surface ◽  
Surface Stiffness ◽  
Cavitation Bubbles

An experimental study has been made of the growth and collapse of a bubble near a composite surface consisting of two viscoelastic materials. The migratory characteristics of the bubble are examined by means of streak photography. The bubble migration depends not only on the properties of the composite surface but also on bubble size and distance from the surface. Both the surface stiffness and surface inertia are considered to be effective parameters contributing to the bubble migration: the former seeming to be a particularly important factor. The state of neutral bubble collapse, with no migration towards or away from a surface, can be made to occur with an appropriate combination of the surface stiffness and inertia.

scholarly journals A Study on Organic Modification of Damping Properties of Polyurethane Materials for Building

2018 ◽  
Vol 175 ◽  
pp. 01017
Author(s):  
Feng Zhou ◽  
Jianjun Gan ◽  
Xin Du ◽  
Ligang Cui
Keyword(s):  
Silicone Oil ◽  
Poor Performance ◽  
Load Test ◽  
Inorganic Filler ◽  
Test Machine ◽  
Polyurethane Elastomer ◽  
Damping Properties ◽  
Viscoelastic Materials ◽  
Viscoelastic Dampers ◽  
Dynamic Load Test

The damping property of viscoelastic dampers is mainly based on the shear hysteretic behaviorof viscoelastic materials, so as to reduce the dynamic response of viscoelastic materials. Therefore, theviscoelastic damping properties of viscoelastic materials greatly affect the viscoelastic dampers. At present, viscoelastic materials mainly use rubber materials, but in this thesis, the excellent properties of polyurethaneelastomer materials are used to replace rubber materials and applied to viscoelastic dampers. However, purepolyurethane elastomer damping properties are related to poor performance, so it should be modified. Basedon the research of inorganic filler-modified polyurethane elastomer, the research group modified the threekinds of organic chemicals with hydroxyl silicone oil, HTPB liquid rubber and epoxy resin E-51, in the lowfrequency region of 0.025Hz-1.5Hz through the dynamic load test machine to test the dampingperformance.

Enhancing the Seismic Resistance of Columns by GFRP Confinement Using Flexible Adhesive-Experimental Study

2014 ◽  
Vol 624 ◽  
pp. 478-485 ◽  
Author(s):  
Natalia Lasowicz ◽  
Arkadiusz Kwiecień ◽  
Robert Jankowski
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Dynamic Behaviour ◽  
Seismic Resistance ◽  
Dynamic Resistance ◽  
Damping Properties ◽  
Flexible Polymer ◽  
Polymer Adhesive

In this paper, the results of two experiments, focused on testing the effectiveness of a method of enhancing the seismic (dynamic) resistance of masonry columns with the use of flexible polymer adhesive, are shown. The first experiment was devoted to investigate the damping properties of a polymer working between two stiff layers, whereas the aim of the second one was to verify if the identified damping properties of the polymer can improve the dynamic behaviour of short masonry columns (prisms) strengthened by confinement made of GFRP grid bonded by the polymer adhesive. The results of the first stage of experimental investigation indicate that bonding two stiff elements with the analyzed polymer adhesive leads to the significant increase in overall damping properties. The results of the second experiment show that the GFRP grid confinement with flexible polymer adhesive is more effective than stiff epoxy and mineral adhesives.

scholarly journals An analytical and experimental study on dampening material effects on the dynamic behavior of free-free aluminum sheets

2021 ◽  
pp. 111-122 ◽  
Author(s):  
R. Khorasani ◽  
S. A. Hosseini Kordkheili ◽  
H. Parviz
Keyword(s):  
Experimental Study ◽  
Analytical Solution ◽  
Dynamic Behavior ◽  
Loss Factor ◽  
Vibration Damping ◽  
Damping Properties ◽  
Free Boundary Conditions ◽  
Aluminum Sheets ◽  
Analytical Relations ◽  
Damping Systems

This work aims to present an experimentally verified analytical solution to examine damping properties of systems including viscoelastic treatments. Although there are several methods for characterizing the behavior of three-layer damping systems, the RKU method is the most frequently used one. In this paper, this method is modified such a way that to be applied for a five-layer damping system. The achieved analytical relations are then employed to study the effects of a four-layer vibration-absorbing coating on the dynamic behavior of an aluminum sheet with free-free boundary conditions. Since the vibration-damping properties of the coating are unknowns, its loss factor and shear modulus are experimentally extracted based on the ASTM E756-05 standard method. The comparison between the analytical solution and performed modal tests expresses the efficiency of the presented method.

Experimental study on damping properties of rubber powder modified styrene-acrylic emulsion concrete beam

2020 ◽  
Vol 32 ◽  
pp. 101728
Author(s):  
Jinxu Mo ◽  
Lei Zeng ◽  
Fan Guo ◽  
Yanhua Liu ◽  
Linling Ma ◽  
...  
Keyword(s):  
Experimental Study ◽  
Concrete Beam ◽  
Damping Properties ◽  
Acrylic Emulsion ◽  
Rubber Powder
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