Microscopic Insight into Electric Fatigue Resistance and Thermally Stable Piezoelectric Properties of (K,Na)NbO3-Based Ceramics

2018 ◽  
Vol 10 (34) ◽  
pp. 28772-28779 ◽  
Author(s):  
Peng Li ◽  
Xiaoqiu Chen ◽  
Feifei Wang ◽  
Bo Shen ◽  
Jiwei Zhai ◽  
...  
Keyword(s):  
Fatigue Resistance ◽  
Piezoelectric Properties ◽  
Thermally Stable ◽  
Electric Fatigue ◽  
Insight Into

Composition Dependent Fatigue in Antiferroelectric PZST Ceramics Induced by Bipolar Electric Cycling

2005 ◽  
Vol 475-479 ◽  
pp. 1193-1196
Author(s):  
Long Jie Zhou ◽  
Georg Rixecker ◽  
André Zimmermann ◽  
Fritz Aldinger
Keyword(s):  
Phase Transition ◽  
Hysteresis Loop ◽  
Fatigue Resistance ◽  
Lead Zirconate Titanate ◽  
Hysteresis Loops ◽  
Lead Zirconate ◽  
Ferroelectric Ceramics ◽  
Fatigue Effect ◽  
Zirconate Titanate ◽  
Electric Fatigue

Bipolar electric fatigue in antiferroelectrics of the lead zirconate titanate stannate ceramics family was investigated. Variations in strain hysteresis loops and damages in microstructure of the materials due to the electric cycling were analyzed. The materials showed symmetric or asymmetric suppression of strain hysteresis loop, normal or diffuse AFE-FE phase transition and intact or damaged microstructure after 5×10-7 cycles, indicating a strong composition dependent fatigue effect and the corresponding mechanism. In general, the antiferroelectric materials exhibited much higher fatigue resistance than ferroelectric ceramics reported previously.

Thermally stable piezoelectric properties of (K, Na)NbO3-based lead-free perovskite with rhombohedral-tetragonal coexisting phase

2017 ◽  
Vol 122 ◽  
pp. 344-351 ◽  
Author(s):  
Mao-Hua Zhang ◽  
Ke Wang ◽  
Jin-Song Zhou ◽  
Jia-Jun Zhou ◽  
Xiangcheng Chu ◽  
...  
Keyword(s):  
Piezoelectric Properties ◽  
Lead Free ◽  
Thermally Stable

scholarly journals An Insight into Machining of Thermally Stable Bulk Nanocrystalline Metals

2018 ◽  
Vol 20 (12) ◽  
pp. 1800405 ◽  
Author(s):  
Vincent H. Hammond ◽  
Thomas L. Luckenbaugh ◽  
Michael Aniska ◽  
David M. Gray ◽  
Joshua A. Smeltzer ◽  
...  
Keyword(s):  
Nanocrystalline Metals ◽  
Thermally Stable ◽  
Bulk Nanocrystalline ◽  
Insight Into

scholarly journals Elastase treatment of tendon specifically impacts the mechanical properties of the interfascicular matrix

2020 ◽  
Author(s):  
Marta S. Godinho ◽  
Chavaunne T. Thorpe ◽  
Steve E. Greenwald ◽  
Hazel R. C. Screen
Keyword(s):  
Mechanical Properties ◽  
Optical Imaging ◽  
Fatigue Resistance ◽  
Fatigue Testing ◽  
Functional Importance ◽  
Uniform Loading ◽  
Tendon Mechanics ◽  
Low Stiffness ◽  
Insight Into

AbstractThe tendon interfascicular matrix (IFM) binds tendon fascicles together. As a result of its low stiffness behaviour under small loads, it enables non-uniform loading and increased overall extensibility of tendon by facilitating fascicle sliding. This function is particularly important in energy storing tendons, with previous studies demonstrating enhanced extensibility, recovery and fatigue resistance in the IFM of energy storing compared to positional tendons. However, the compositional specialisations within the IFM that confer this behaviour remain to be elucidated. It is well established that the IFM is rich in elastin, therefore we sought to test the hypothesis that elastin depletion (following elastase treatment) will significantly impact IFM, but not fascicle, mechanical properties, reducing IFM resilience in all samples, but to a greater extent in younger tendons, which have a higher elastin content. Using a combination of quasi-static and fatigue testing, and optical imaging, we confirmed our hypothesis, demonstrating that elastin depletion resulted in significant decreases in IFM viscoelasticity, fatigue resistance and recoverability compared to untreated samples, with no significant changes to fascicle mechanics. Ageing had little effect on fascicle or IFM response to elastase treatment.This study offers a first insight into the functional importance of elastin in regional specific tendon mechanics. It highlights the important contribution of elastin to IFM mechanical properties, demonstrating that maintenance of a functional elastin network within the IFM is essential to maintain IFM and thus tendon integrity.

scholarly journals Influence of Matrix and Surfactant on Piezoelectric and Dielectric Properties of Screen-Printed BaTiO3/PVDF Composites

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2166
Author(s):  
Carlo Carbone ◽  
Mohammed Benwadih ◽  
Giulia D’Ambrogio ◽  
Minh-Quyen LE ◽  
Jean-Fabien Capsal ◽  
...  
Keyword(s):  
Screen Printing ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Composite Layer ◽  
Fluorinated Surfactants ◽  
Different Temperatures ◽  
The Impact ◽  
Dielectric And Piezoelectric Properties ◽  
Insight Into ◽  
Screen Printed

The aim of this paper was to provide insight into the impact of matrix and surfactants on the rheology, morphology, and dielectric and piezoelectric properties of screen-printed BaTiO3/PVDF composites. Two matrices were compared (PVDF–HFP and PVDF–TrFE), and lead-free BaTiO3 microparticles were added in volume fractions of 30% and 60%. Here, we demonstrated that the presence of surfactants, helping to prevent phase separation, was crucial for achieving a decent screen-printing process. Fourier-transform infrared (FTIR) spectroscopy together with scanning electron microscopy (SEM) showed that the two “fluoro-benzoic acid” surfactants established stable bonds with BaTiO3 and improved the dispersion homogeneity, while the “fluoro-silane” proved to be ineffective due to it evaporating during the functionalization process. PVDF–TrFE composites featured a more homogeneous composite layer, with fewer flaws and lower roughness, as compared with PVDF–HFP composites, and their inks were characterized by a higher viscosity. The samples were polarized in either AC or DC mode, at two different temperatures (25 °C and 80 °C). The 30% BaTiO3 PVDF–TrFE composites with two fluorinated surfactants featured a higher value of permittivity. The choice of the surfactant did not affect the permittivity of the PVDF–HFP composites. Concerning the d33 piezoelectric coefficient, experimental results pointed out that PVDF–TrFE matrices made it possible to obtain higher values, and that the best results were achieved in the absence of surfactants (or by employing the fluoro-silane). For instance, in the composites with 60% BaTiO3 and polarized at 80 °C, a d33 of 7–8 pC/N was measured, which is higher than the values reported in the literature.

Analysis of Friction Stir Riveting Processes: A Review

2017 ◽  
Author(s):  
Haris Ali Khan ◽  
Jingjing Li ◽  
Chenhui Shao
Keyword(s):  
Mechanical Properties ◽  
Detailed Analysis ◽  
Fatigue Resistance ◽  
Process Parameters ◽  
Dissimilar Materials ◽  
Significant Rise ◽  
Operating Principle ◽  
Friction Stir ◽  
Microstructure Modification ◽  
Insight Into

This study presents a detailed analysis of friction stir riveting (FSR) processes that are used for joining similar as well as dissimilar materials. It covers the operating principle of FSR methods along with the insight into various process parameters responsible for successful joints formation. The paper further evaluates the research in friction stir-based riveting processes which unearth the enhanced metallurgical and mechanical properties for instance microstructure modification, local mechanical properties and improved strength, corrosion and fatigue resistance. The results of the study show that use of FSR process yields refined microstructures and improved mechanical properties in materials, which will entail a significant rise in the usage of friction stir-based riveting processes.

New Insight into the Fatigue Resistance of Photochromic 1,2-Diarylethenes

2017 ◽  
Vol 121 (42) ◽  
pp. 23592-23598 ◽  
Author(s):  
Giorgio Pariani ◽  
Martino Quintavalla ◽  
Letizia Colella ◽  
Luca Oggioni ◽  
Rossella Castagna ◽  
...  
Keyword(s):  
Fatigue Resistance ◽  
Insight Into

Calibration problems in hydrogen luminosities

1966 ◽  
Vol 24 ◽  
pp. 322-330
Author(s):  
A. Beer
Keyword(s):  
Galactic Structure ◽  
B Stars ◽  
Insight Into

The investigations which I should like to summarize in this paper concern recent photo-electric luminosity determinations of O and B stars. Their final aim has been the derivation of new stellar distances, and some insight into certain patterns of galactic structure.

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