Article
Multidisciplinary Sciences
Buil Jeon, Dongsoo Han, Giwan Yoon
Summary: In this study, the piezoelectric characteristics of polyvinyl alcohol (PVA)-mixed DL-alanine (PVA/DL-alanine) polycrystals in the d33 mode were investigated. The d33 piezoelectric coefficients increased with an increase in the weight ratio of DL-alanine, and the PVA/DL-alanine polycrystal with a weight ratio of 1:3 exhibited a d33 of approximately 5 pC/N. The crystal structure of the PVA/DL-alanine polycrystals was analyzed using scanning electron microscopy and X-ray diffraction.
Article
Materials Science, Composites
J. Sommer, M. Hajikazemi, I. De Baere, W. Van Paepegem
Summary: This study aims to investigate the damage mechanisms in glass fiber reinforced polypropylene multidirectional laminates under uniaxial quasi-static loading conditions through in-situ experimental observation, quantification and theoretical modeling. The full-field strains are measured using Stereo Digital Image Correlation systems, and a physics-based modeling technique is used to validate the experimental measurements. The effects of ply thickness, off-axis ply orientation, and location on damage initiation and growth are studied.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Qiaosheng Pan, Ziliang Huang, Mingfei Zhao, Liwei Chen, Qiangxian Huang, Ruijun Li
Summary: This study proposes a dual-stator piezoelectric motor that can work in resonant and quasi-static states to achieve high speed and high resolution cross-scale output. The motor utilizes two piezoelectric stators with a frequency of 1:2 and a vibration amplitude ratio of 2:1 to drive a sliding table with multipoint friction coupling, generating asymmetric sawtooth wave vibration. Combined with the inertia force of the sliding table, the motor achieves stepping motion. A prototype is designed and modal analysis is conducted to determine the resonant frequencies. Numerical analysis is performed to obtain the trajectory and output characteristics of the sliding table. Experimental results show that the motor has a minimum speed of 0.013 mm/s, resolution of 0.5 mu m, maximum speed of 11.14 mm/s, and maximum load of 40 g.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Instruments & Instrumentation
Qiaosheng Pan, Mingfei Zhao, Yifang Zhang, Chen Li, Chunli Zhu, ShanLin Liu
Summary: This study proposes an inertia piezoelectric motor based on bipedal driven, which can work in both quasi-static and resonant states. The motor utilizes two sinusoidal electrical signals with a frequency ratio of 1:2 to generate sinusoidal vibrations and then synthesizes them into mechanical sawtooth vibrations. The resonant frequencies of the motor are adjusted to combine the vibrations in the resonant state. The prototype of the motor shows consistent motion characteristics with theoretical analysis, indicating an effective approach to improve the comprehensive performance of the piezoelectric motor.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Wenjun Fang, Xujing Yang, Xinxin Xu, Weiwei Li, Qing Li
Summary: The study reveals the influence mechanism of cooling rates on the mechanical properties of CGF/PPR composites, showing that the tensile strength and impact resistance vary with cooling rates, with the presence of boundary defects and lamellae thickness playing important roles in the overall performance.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Chuanrong Zhao, Deren Kong
Summary: This article presents a mathematical model of the piezoelectric pressure measurement system using a second-order differential equation with constant coefficients and gives a method to obtain the nominal sectional mathematical model. Quasi-static calibration tests show that the response characteristics of the system to quasi-static pressure pulses with different amplitudes are significantly different.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Physics, Applied
Ze-Qi Lu, Jie Chen, Hai-Ling Fu, Hu Ding, Li-Qun Chen
Summary: This study designed and evaluated a nonlinear piezoelectric energy harvester with coupled d(31) and d(33) modes. The contribution of d(31) and d(33) to the output was investigated using an axially moving piezoelectric beam (AMPB), and the critical parameters of the configuration were determined. A distributed parametric electromechanical model was established to characterize the non-linear dynamics of AMPB with d(31) and d(33) modes. The Galerkin approach and the harmonic-balance approach were employed to investigate the forced response of the energy harvesting system, and the effects of axial velocity on energy harvesting were discussed.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Composites
Nahit Oztoprak, Okan Ozdemir, Halis Kandas
Summary: This study investigates the mechanical characterization of thermoplastic composites with additional fiber hybridization, specifically focusing on hybridization of long glass fiber-reinforced polypropylene composite with aramid and carbon fabrics. Results show that the hybrid configuration with aramid fabric reinforcements exhibits approximately 15.5% higher maximum penetration force at 60 degrees Celsius test temperature.
JOURNAL OF COMPOSITE MATERIALS
(2022)
Article
Instruments & Instrumentation
H. Holzmann, Y. J. Park, G. Stoll, H. Atzrodt, S. Herold
Summary: This article introduces a concept of bending strain energy harvesting using ferroelectret materials, which converts the bending strain energy of a host structure into compressive strain energy of the ferroelectret material to generate electricity. The experimental results validate the optimized energy harvester model and demonstrate the power output and power-to-mass ratio under different conditions.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Mathematics
Pin Wang, Tubing Yin, Xibing Li, Heinz Konietzky
Summary: Microwave irradiation on rocks can effectively reduce equipment wear and energy consumption during mechanical cutting. The increase in water content improves the microwave heating capacity of the rock and leads to a decrease in weight, P-wave velocity, and tensile strength, as well as an increase in porosity and damage factor.
Article
Acoustics
Kyusic Park, Matthew S. Allen
Summary: This study contrasts the quasi-static modal analysis approach with reduced order modeling methods in addressing nonlinear structural problems, highlighting the deficiencies of each and proposing a new hybrid method, SICE-ROM, which combines the strengths of both to accurately capture resonant behavior in structures.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Mechanics
B. Zhang, J. G. Yu, X. M. Zhang, L. Elmaimouni
Summary: The guided waves in a 1-D hexagonal piezoelectric quasi-crystal plate were investigated using the Legendre polynomial method within Bak's model. Three cases of quasi-periodic directions were discussed, revealing new wave phenomena that can contribute to the design and optimization of piezoelectric devices.
Article
Materials Science, Composites
Ali Imran Ayten
Summary: The quasi-static punch shear behaviors of thermoplastic composites with different polymer matrices and fiber types were studied to investigate energy absorption capability. The study found that MA-g-PP matrix exhibited higher energy absorption compared to MA-g-ABS, and aramid fiber showed significant improvement in energy absorption in MA-g-ABS matrix composites.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Pengcheng Jiao, Yang Yang, KingJames Idala Egbe, Zhiguo He, Yingtien Lin
Summary: A study on developing mechanical metamaterial-enabled piezoelectric nanogenerators for generating electrical power in low-frequency environments, such as the ocean. Optimization efforts were made to maximize power generation through changes in geometric and material considerations. These piezoelectric nanogenerators are considered a potential green solution for energy issues in various fields.
Article
Materials Science, Characterization & Testing
Dongshuang Yao, Ji Fu, Faxin Li
Summary: Instrumented indentation is a powerful mechanical characterization method for materials, with the proposed piezoelectric bimorph cantilever method offering convenient measurement of both quasi-static and dynamic properties of soft materials. Results from testing silica gel and Polydimethylsiloxane samples show good agreement with traditional tensile testing, indicating potential widespread use of this method in the future.
