THE INFLUENCE OF VIBRATION DAMPING MATERIALS' COMPOSITION ON THEIR MECHANICAL LOSS FACTOR

2015 ◽  
Vol 0 (10) ◽  
pp. 10-10 ◽  
Author(s):  
V.A. Sagomonova ◽  
◽  
V.I. Kislyakova ◽  
T.Yu. Tyumeneva ◽  
V.A. Bolshakov ◽  
...  
Keyword(s):  
Loss Factor ◽  
Vibration Damping ◽  
Mechanical Loss ◽  
Damping Materials ◽  
Mechanical Loss Factor

Rheological Behaviors of Graphene Oxide/Polyacrylonitrile Spinning Solutions

2017 ◽  
Vol 898 ◽  
pp. 2187-2196 ◽  
Author(s):  
Feng Mei Li ◽  
Ying Ying Zheng ◽  
Biao Wang
Keyword(s):  
Activation Energy ◽  
Graphene Oxide ◽  
Loss Factor ◽  
Viscosity Index ◽  
Structural Viscosity ◽  
Mechanical Loss ◽  
Flow Activation Energy ◽  
Rheological Behaviors ◽  
Flow Activation ◽  
Mechanical Loss Factor

The rheological behaviors of polyacrylonitrile (PAN) in NaSCN aqueous solutions containing different amount of Graphene oxide (GO) were investigated through both steady-state and dynamic rheological measurements. The parameters such as apparent viscosity (ηα), flow activation energy (Eη), structural viscosity index (Δη), storage modulus (G’), loss modulus (G’’) and mechanical loss factor (tanδ) were measured to illustrate the rheological behaviors of these solutions. The results showed that the apparent viscosity decreased with adding appropriate amount of GO, while the structural viscosity index, the flow activation energy and the mechanical loss factor of GO/PAN spinning solutions increased. Accordingly, a possible mechanism of GO effect on rheological behaviors of PAN solution was proposed in this work.

scholarly journals Embedded NiTi Wires for Improved Dynamic Thermomechanical Performance of Silicone Elastomers

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5076
Author(s):  
Umut D. Çakmak ◽  
Ingrid Graz ◽  
Richard Moser ◽  
Michael Fischlschweiger ◽  
Zoltán Major
Keyword(s):  
Thermal Conductivity ◽  
Shape Memory ◽  
Loss Factor ◽  
Niti Alloy ◽  
Viscoelastic Behavior ◽  
Thermomechanical Analysis ◽  
Mechanical Loss ◽  
Silicone Elastomers ◽  
Niti Wires ◽  
Mechanical Loss Factor

The extraordinary properties of shape memory NiTi alloy are combined with the inherent viscoelastic behavior of a silicon elastomer. NiTi wires are incorporated in a silicon elastomer matrix. Benefits include features as electrical/thermal conductivity, reinforcement along with enhanced damping performance and flexibility. To gain more insight of this composite, a comprehensive dynamic thermomechanical analysis is performed and the temperature- as well as frequency-dependent storage modulus and the mechanical loss factor are obtained. The analyses are realized for the composite and single components. Moreover, the models to express the examined properties and their temperature along with the frequency dependencies are also presented.

Passive Vibration Damping Materials: Piezoelectric Ceramic Composites for Vibration Damping Applications.

1995 ◽  
Author(s):  
Shoko Yoshikawa ◽  
R. Meyer ◽  
J. Witham ◽  
S. Y. Agadda ◽  
G. Lesieutre
Keyword(s):  
Piezoelectric Ceramic ◽  
Ceramic Composites ◽  
Vibration Damping ◽  
Damping Materials

Preparation and Vibration Damping Characteristics of Wide Frequency Domain PVMQ/IIR Foam Materials

2012 ◽  
Vol 538-541 ◽  
pp. 2298-2303
Author(s):  
Shi Kai Luo ◽  
Guo Fang Ding ◽  
Jing Li Li ◽  
Yan Song Sha ◽  
Qing Min Cheng ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Wide Temperature Range ◽  
Damping Ratio ◽  
Vibration Damping ◽  
Simple Equation ◽  
Structural Damping ◽  
Damping Characteristics ◽  
Damping Materials ◽  
Foaming Technology ◽  
Isoprene Rubber

In this paper, we prepared foaming silicon rubber (PVMQ) /isobutylene-isoprene rubber (IIR) composites with chemical foaming technology. The DMA tests results showed that these foaming materials have effective damping characteristics in a wide temperature range. With the special vibrator, we found that the PVMQ/IIR foams that we prepared were the damping materials which has wide frequency domain, because they can keep high damping ratio in a wide frequency domain. When the preloading was between 1.0 mm and 1.7 mm, the structural damping did not change obviously. According to tests, we found that the damping ratio of these foams was fit to the simple equation .

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