Damping Properties of Epoxy-Embedded Piezoelectric Composites

2012 ◽  
Vol 512-515 ◽  
pp. 1342-1346 ◽  
Author(s):  
Xuan Qing Hong ◽  
Xu Sheng Wang ◽  
Xiang Ming Li ◽  
Rui Chen ◽  
Xi Yao ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Loss Factor ◽  
Composite System ◽  
Piezoelectric Effect ◽  
Piezoelectric Materials ◽  
Mechanical Analysis ◽  
Damping Properties ◽  
Piezoelectric Composites ◽  
Testing Frequency ◽  
Piezoelectric Devices

The 0-3 and 1-3 composites have been widely used to produce various kinds of piezoelectric devices. This article focuses on the damping properties of the epoxy/piezoelectric composites. Due to the piezoelectric effect, the composites are expected to improve the damping properties and can be used in the field of vibration reduction and noise control. Two piezoelectric materials were embedded into the epoxy resin to make specimens, T-ZnOw/epoxy resin as 0-3 and PZT fibers/epoxy resin as 1-3 composite. With the method of dynamic mechanical analysis, the temperature dependence of the mechanical storage modulus and the loss factor (tanδ) were measured at different frequencies. The experimental results clearly show that the loss factor increases when testing frequency is higher. In this study, the piezoelectric damping and the viscoelastic effect are discussed and both of them contribute to the damping property of the composite system.

A strengthening approach for damping property and shape memory property of acrylic rubber/polylactide blends

2018 ◽  
Vol 51 (7-8) ◽  
pp. 626-643
Author(s):  
Chengliang Li ◽  
Xingxing Ji ◽  
Yang Lyu ◽  
Xinyan Shi
Keyword(s):  
Shape Memory ◽  
Loss Factor ◽  
Phenol Formaldehyde ◽  
Mechanical Analysis ◽  
Damping Properties ◽  
Shape Memory Property ◽  
Memory Property ◽  
Damping Material ◽  
Shape Memory Properties ◽  
Shape Memory Effects

In this work, a damping material was successfully prepared by blending acrylic rubber (ACM) and polylactide (PLA) with sulfur and soap salt as the curing agents. A phenol-formaldehyde (PF) resin was used as a modifier. The effects of PF on the mechanical properties, damping properties, compatibility and shape memory properties of the blends were studied. The compatibility and damping properties were characterized by dynamic mechanical analysis, Fourier transform infrared spectroscope and microstructure analysis. The shape memory properties were examined by thermal mechanical analyser. The results revealed that the tensile strength of the blends was decreased and the toughness was increased with the increase of PF loadings. The introduction of PF improved the compatibility between PLA and ACM, which was deduced from the fact that the glass transition temperature of ACM was increased and the two loss factor peaks became closer. It was also found that the loss factor peak became higher and the effective damping temperature range became wider due to the formation of hydrogen bonding, implying that the damping properties of ACM/PLA blends were significantly improved. The ACM/PLA blends exhibited good dual-shape memory effect and its shape recovery ratio was increased by introduction of PF and raising the trigger temperature. The blends also exhibited good triple-shape memory property, which was dramatically improved by the introduction of PF. The mechanisms for the enhanced shape memory effects were then analysed.

scholarly journals A Method for Quantitatively Separating the Piezoelectric Component from the as-received "Piezoelectric" Signal

2021 ◽  
Author(s):  
Chaojie Chen ◽  
Shilong Zhao ◽  
Caofeng Pan ◽  
Yunlong Zi ◽  
Fangcheng Wang ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Piezoelectric Effect ◽  
Piezoelectric Materials ◽  
Contact Electrification ◽  
Poly Vinylidene Fluoride ◽  
Implantable Electronics ◽  
The Time Domain ◽  
Electric Signals ◽  
Piezoelectric Devices ◽  
Piezoelectric Performance

Abstract Polymer-based piezoelectric devices are promising for developing future wearable force sensors, nanogenerators, and implantable electronics etc. The electric signals generated by them are often assumed as solely coming from piezoelectric effect. However, triboelectric signals originated from contact electrification between the piezoelectric devices and the contacted objects can produce non-negligible interfacial electron transfer, which is often combined with the piezoelectric signal to give a triboelectric-piezoelectric hybrid output, leading to an exaggerated measured “piezoelectric” signal. Herein, a simple and effective method is proposed for quantitatively identifying and extracting the piezoelectric charge from the hybrid signal. The triboelectric and piezoelectric parts in the hybrid signal generated by a poly(vinylidene fluoride)-based device are clearly differentiated, and their force and charge characteristics in the time domain are identified. This work presents an effective method to elucidate the true piezoelectric performance in practical measurement, which is crucial for evaluating piezoelectric materials fairly and correctly.

Study on the Properties of Microwave Curing Epoxy Resin/Nano-Fe Composite Materials

2010 ◽  
Vol 26-28 ◽  
pp. 356-359 ◽  
Author(s):  
Xiao Feng Sun ◽  
Shi Ning Ma ◽  
Jia Wu He ◽  
Nai Shu Zhu
Keyword(s):  
Composite Materials ◽  
Microwave Irradiation ◽  
Epoxy Resin ◽  
Loss Factor ◽  
Mechanical Analysis ◽  
Resin Matrix ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Curing ◽  
Scanning Electron

Nano-Fe particles were selected as microwave-absorber, and added in the epoxy resin. Epoxy resin/nano-Fe composite materials were cured by microwave irradiation and heating. Vector network analysis, dynamic mechanical analysis(DMA) and scanning electron microscope(SEM) were used to study the curing behaviors of composite materials under the different curing ways. Results show that the dielectric constant(εr) and the dielectric loss factor(tanδ) of the epoxy resin increased obviously when nano-Fe particles were added, and microwave absorption properties of epoxy resin/nano-Fe composite materials improved greatly with increasing contents of nano-Fe particles. DMA results indicate that the storage modulus (E’) and glass transition temperature(Tg) of epoxy resin samples with nano-Fe particles were higher than those without nano-Fe particles. The microstructure and phase composition of the samples were studied by SEM and EDX. Results show that nano-Fe particles were homogeneously dispersed in the epoxy resin matrix under microwave irradiation, which implies improved strength and toughness of epoxy resin/nano-Fe composite materials.

PZT / MWNTs / EP Piezoelectric Damping Composites Conductivity and Dynamic Mechanical Analysis

2013 ◽  
Vol 668 ◽  
pp. 70-74
Author(s):  
Chong Guang Zang ◽  
Xian Peng Cao
Keyword(s):  
Loss Factor ◽  
Performance Test ◽  
Mechanical Performance ◽  
Piezoelectric Effect ◽  
Ceramic Powder ◽  
Mechanical Analysis ◽  
Dissipation Mechanism ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

According to piezoelectricity and electrical conductivity theory, the ternary system piezoelectric damping composites containing piezoelectric ceramic powder (PZT) / multi-walled carbon nanotubes (MWNTs) / epoxy resin (EP) were developed. Through the conductive and mechanical performance test of composites, the paper showed the piezoelectric damping energy dissipation mechanism of polymer composites. Results indicated that: the loss factor of materials would increase with the increasing of PZT content. When the content of PZT exceeded a certain value, tanδ would increase dramatically. When the content of MWNTs is 2%, tanδ reached a high value. This meant composites played the role of shock absorbing by conducting electricity from piezoelectric effect of PZT to external circuit.

Study on the Synthesis and Properties of EP/PU Composite

2011 ◽  
Vol 221 ◽  
pp. 135-139 ◽  
Author(s):  
Xiao Qian Wang ◽  
Zhi Xiong Huang ◽  
Juan Li Zheng ◽  
Qi Lin Mei
Keyword(s):  
Mechanical Properties ◽  
Polyethylene Glycol ◽  
Epoxy Resin ◽  
Ftir Spectrum ◽  
Damping Properties ◽  
Testing Frequency ◽  
Higher Temperature

Isocyanate-terminated polyurethane was synthesized from polyethylene glycol and toluene disocyantes, which was used to modify the epoxy resin. D-230 was chosen as hardener to produce the PU/EP composite. The structure of composite was characterized by FTIR spectrum. Mechanical properties of the epoxy resin with different PU content were studied. Additionally, damping properties of the PU/EP composite were investigated using DMA, and the results showed that the damping properties of EP evidently improved by blending with PU and with the testing frequency increased, the spectra of tanδ-T shifted to higher temperature.

The Effect of Nano-Filler on the Damping Properties of Polyacrylic Damping Paint

2011 ◽  
Vol 183-185 ◽  
pp. 2154-2157 ◽  
Author(s):  
Peng Chen ◽  
Yang Liu ◽  
Ming Wei Di
Keyword(s):  
Loss Factor ◽  
Dynamic Mechanical Properties ◽  
Mechanical Analysis ◽  
Damping Properties ◽  
Dynamic Mechanical ◽  
Temperature Range ◽  
Nano Silicon ◽  
Polyacrylic Ester ◽  
Peak Value ◽  
Rubber Filler

The dynamic mechanical properties of the blends of polyacrylic ester and various nano-fillers and the effect of nano-filler on the damping properties of polyacrylic ester damping paint were studied by using dynamic mechanical analysis (DMA) in this paper. The experiment results showed that the glass-transition temperature (Tg), loss factor peak value and effective damping temperature range for the polyacrylic ester damping paint changed correspondingly after blended with various nano-fillers. The damping properties and effective damping temperature range of the polyacrylic ester damping paint would be improved effectively by adding nano-polyacrylic ester rubber filler; the nano-silicon dioxide could enhance the damping properties for the polyacrylic ester damping paint, but the degree of improvement for effective damping temperature range was inferior to nano-polyacrylic ester rubber filler; and the nano-calcium carbonate could also improve the damping properties of the damping paint, but the effective damping temperature range was hardly improved.

Damping Properties and Mechanism of 0-3 PMN/CB/EP Composites

2009 ◽  
Vol 66 ◽  
pp. 45-48 ◽  
Author(s):  
Min Xian Shi ◽  
Zhi Xiong Huang ◽  
Tao Wei ◽  
Lian Meng Zhang
Keyword(s):  
Carbon Black ◽  
Epoxy Resin ◽  
Loss Factor ◽  
Piezoelectric Ceramic ◽  
Volume Resistivity ◽  
Damping Properties ◽  
Casting Method ◽  
Conductive Carbon Black ◽  
Damping Loss Factor ◽  
Peak Value

0-3 piezoelectric ceramic PMN/conductive carbon black(CB)/epoxy resin(EP) composites were prepared by resin casting method. The electric and damping properties of PMN/CB/EP composites were detected. The volume resistivity of the composites decreases with the addition of conductive carbon black, and the composites experience transition from insulator to semiconductor when the CB content is 6% weight of the resin in the composites. Damping loss factor-temperature curves scanned by DMA showed that the peak value of damping loss factor(tanmax), the loss factor area(TA) and the damping temperature range(T) of the composites increase and reach to maximum values when CB content is 6% weight of EP resin, then drop a little with CB contents further increasing. When CB was just at threshold content 6% of epoxy weight the composite converts from insulator to semiconductor with the volume resistivity being about 108 Ωm and piezo-damping mechanism plays efficiently.

Study on Damping Properties of Fiber Reinforced Compositefor Stayed Cable

2010 ◽  
Vol 163-167 ◽  
pp. 288-292
Author(s):  
Yan Liang Du ◽  
Jian Zhi Li ◽  
Bao Chen Sun
Keyword(s):  
Loss Factor ◽  
Vinyl Ester ◽  
Fiber Composite ◽  
Mechanical Analysis ◽  
Reinforced Composites ◽  
Damping Properties ◽  
Fiber Reinforced ◽  
Carbon Fiber Composite ◽  
Temperature Spectrum ◽  
Different Temperatures

Fiber reinforced vinyl ester composites and fiber reinforced epoxy composites were prepared by the pultrusion method. Due to the extensive application of fiber reinforced composites, the temperature spectrum and frequency spectrum of loss factor for the composite were tested using dynamic mechanical analysis (DMA) equipment. The damping properties and damping mechanism of the composite were investigated and discussed at different temperatures and frequencies. The result indicates that the loss factor of the composites is increasing with the increase of the frequency from 0.1Hz to 2 Hz and decreasing with the decrease of the temperature from -20°C to 60°C. The loss factor of the carbon fiber composite is higher than that of the glass fiber for the same matrix. The loss factor of the vinyl ester composite is higher than that of the epoxy composite for the same fiber.

The influence of microcapsules with a partially filled structure on the damping properties of an epoxy resin

2018 ◽  
Vol 42 (14) ◽  
pp. 12119-12125 ◽  
Author(s):  
Xiaoyu Shi ◽  
Yilong Song ◽  
Zhenzhen Cai ◽  
Xuesong Wang ◽  
Danfeng Cao ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Loss Factor ◽  
Volume Fraction ◽  
Damping Properties ◽  
The Core ◽  
P Loss ◽  
Core Volume

Loss factor relies on the core volume fraction and the concentration of the microcapsule in the epoxy resin.

scholarly journals Piezoelectric Energy Harvesting Solutions: A Review

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3512 ◽  
Author(s):  
Corina Covaci ◽  
Aurel Gontean
Keyword(s):  
Energy Harvesting ◽  
Piezoelectric Effect ◽  
Piezoelectric Transducers ◽  
Piezoelectric Energy Harvesting ◽  
Piezoelectric Energy ◽  
Direct Piezoelectric Effect ◽  
Harvesting Technique ◽  
Different Shapes ◽  
Piezoelectric Devices ◽  
Review Current

The goal of this paper is to review current methods of energy harvesting, while focusing on piezoelectric energy harvesting. The piezoelectric energy harvesting technique is based on the materials’ property of generating an electric field when a mechanical force is applied. This phenomenon is known as the direct piezoelectric effect. Piezoelectric transducers can be of different shapes and materials, making them suitable for a multitude of applications. To optimize the use of piezoelectric devices in applications, a model is needed to observe the behavior in the time and frequency domain. In addition to different aspects of piezoelectric modeling, this paper also presents several circuits used to maximize the energy harvested.

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