Effect of Inter-Rod Coupling on 1-3 Piezocomposite High-Power Ultrasonic Transducers

2012 ◽  
Vol 476-478 ◽  
pp. 2105-2108 ◽  
Author(s):  
Yu Li Lin ◽  
Gin Shin Chen ◽  
Hsin Chih Liu ◽  
Yu Cheng Lin
Keyword(s):  
High Power ◽  
Volume Fraction ◽  
Epoxy Composite ◽  
Ultrasonic Transducer ◽  
Geometric Parameters ◽  
Experimental Results ◽  
Ultrasonic Transducers ◽  
Composite Matrix ◽  
Volume Fractions ◽  
Power Ultrasonic

Efficiency is a critical performance for a high-power ultrasonic transducer composed of 1-3 piezocomposites and geometric parameters of the composites can influence the efficiency of the transducer. The effect of inter-rod responses in the composite matrix on the efficiency was experimentally investigated in this study. For analyses, four PZT4-epoxy composite ultrasonic transducers with various volume fractions and inter-rod spacing were fabricated in-house. The experimental results demonstrated that the inter-rod coupling of the 0.1-mm spacing could significantly degrade the efficiency of the composite probe at about 1.0 MHz resonance since the 0.1-mm spacing between PZT4 rods was so small as to cause a high interference. At the same volume fraction, the transducer engineer should take the inter-rod coupling into account for the design of the high-power ultrasonic transducer.

scholarly journals Development of Expanded Takayanagi Model for Tensile Modulus of Carbon Nanotubes Reinforced Nanocomposites Assuming Interphase Regions Surrounding the Dispersed and Networked Nanoparticles

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 233 ◽  
Author(s):  
Yasser Zare ◽  
Kyong Yop Rhee
Keyword(s):  
Carbon Nanotubes ◽  
Volume Fraction ◽  
Tensile Modulus ◽  
Experimental Results ◽  
Volume Fractions ◽  
Interphase Region ◽  
Acceptable Agreement ◽  
Network Modulus ◽  
Neat Matrix

In this paper, we consider the interphase regions surrounding the dispersed and networked carbon nanotubes (CNT) to develop and simplify the expanded Takayanagi model for tensile modulus of polymer CNT nanocomposites (PCNT). The moduli and volume fractions of dispersed and networked CNT and the surrounding interphase regions are considered. Since the modulus of interphase region around the dispersed CNT insignificantly changes the modulus of nanocomposites, this parameter is removed from the developed model. The developed model shows acceptable agreement with the experimental results of several samples. “ER” as nanocomposite modulus per the modulus of neat matrix changes from 1.4 to 7.7 at dissimilar levels of “f” (CNT fraction in the network) and network modulus. Moreover, the lowest relative modulus of 2.2 is observed at the smallest levels of interphase volume fraction ( ϕ i < 0.017), while the highest “ ϕ i ” as 0.07 obtains the highest relative modulus of 11.8. Also, the variation of CNT size (radius and length) significantly changes the relative modulus from 2 to 20.

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