A supplementary study on fracture tests of piezoelectric material: cracks parallel to the poling direction

2012 ◽  
Vol 175 (2) ◽  
pp. 109-125 ◽  
Author(s):  
Leslie Banks-Sills ◽  
Liat Heller ◽  
Victor Fourman
Keyword(s):  
Piezoelectric Material ◽  
Poling Direction ◽  
Fracture Tests

Towards a More Complete Understanding of PMN-PT 4 Point Bend Specimen Behavior

2010 ◽  
Author(s):  
Virginia G. DeGiorgi ◽  
Stephanie A. Wimmer
Keyword(s):  
Piezoelectric Material ◽  
Mechanical Loading ◽  
Electric Fields ◽  
Experimental Work ◽  
Computational Study ◽  
Piezoelectric Materials ◽  
Bend Specimen ◽  
Linear Behavior ◽  
Poling Direction ◽  
Point Bend

ASTM Standard C1161 is often used to determine fracture performance of piezoelectric materials. The basic geometry of C1161 is a four-point beam subjected to mechanical loading. When single crystal PMN-PT was recently subjected to this test unexpected results were observed. Fracture did not occur at the defects incorporated into the specimens nor did failure occur at locations of where maximum stress or strain was predicted by mechanical analyses. Computational tools were then applied to determine piezoelectric material response in this geometry with applied mechanical loading. Conventional finite element codes with piezoelectric material constitutive response using linear behavior models were used. Rather than duplicate the experimental work, the goal of this analysis was to provide insight into the electric fields that would be generated due to mechanical loading of the four-point bend specimen and the resulting variations in stress and deformations. Variation in poling directions is examined. Three different four-point bend configurations are considered. In each specimen the poling direction is aligned with one of the axes of the geometry. The computational study was done as a pre-screening analysis to determine if further understanding of the piezoelectric phenomenon could be expected in a series of experiments of similar design. Experimental work is currently under development based on the computational results of this study. The intent is to used computational analysis to advance understanding to enhance experimental design.

Topology Optimization of Energy Harvesting Skin Structure Utilizing Harmonic Vibration

2011 ◽  
Author(s):  
Soobum Lee ◽  
Andres Tovar
Keyword(s):  
Finite Element ◽  
Topology Optimization ◽  
Energy Harvesting ◽  
Piezoelectric Material ◽  
Finite Element Models ◽  
Material Distribution ◽  
Skin Structure ◽  
Piezoelectric Energy ◽  
Poling Direction ◽  
Sustainable Health

This paper presents a piezoelectric energy harvesting skin (EHS) design using topology optimization. EHS was motivated to embody a power-generating skin structure by attaching thin piezoelectric patches onto a vibrating skin for the purpose of self-sustainable health monitoring with wireless sensors. In this paper the hybrid cellular automata (HCA) algorithm is involved to optimize piezoelectric material distribution on a harmonically vibrating skin structure. Valid computational (finite element) models for vibrating structure are constructed, and the optimal piezoelectric material distribution is found on a surface of the structure. The piezoelectric material is modeled with penalization, and the optimal density and poling direction is found per each piezoelectric finite element using HCA algorithm. HCA algorithm demonstrated its ability to find the optimal design for piezoelectric material to yield maximum power output.

Modeling and Optimization of Novel Actuators Produced by Solid Freeform Fabrication

2000 ◽  
Vol 625 ◽  
Author(s):  
B.A. Cheeseman ◽  
X.P. Ruan ◽  
A. Safari ◽  
S.C. Danforth ◽  
T.W. Chou
Keyword(s):  
Electric Field ◽  
Piezoelectric Material ◽  
Solid Freeform Fabrication ◽  
Element Analysis ◽  
Freeform Fabrication ◽  
Piezoceramic Actuator ◽  
Electric Field Direction ◽  
Poling Direction ◽  
Spiral Geometry ◽  
Key Issues

AbstractThe ability of Solid Freeform Fabrication (SFF) to produce complex piezoceramic architectures has enabled the development of novel designs for PZT actuators. Recently, it has been shown that through the intelligent application of actuator geometry, poling direction, piezoelectric material, and electric field direction, the force and displacement output of a piezoelectric actuator could be optimized. The current investigation examines several piezoceramic actuator geometries, including dome, spiral and a telescoping shaped actuators. Using finite element analysis (FEA), parametric studies are performed to identify some key issues in the optimization of actuator performance. Results of the dome study indicate that an actuator having a tangentially alternating poling direction and applied electric field exhibits a much larger displacement when compared to dome actuators having either a through-the-thickness or tangential poling direction. Analysis of spiral actuators indicates that the spiral geometry results in pronounced displacement amplification when compared to the displacement of an equivalent length piezoelectric strip. In summary, some remarks will be made on the optimal use of piezoelectric material properties and actuator geometry in actuator design.

Active vibration control of smart structure using poling tuned piezoelectric material

2020 ◽  
Vol 31 (10) ◽  
pp. 1298-1313
Author(s):  
Saurav Sharma ◽  
Anuruddh Kumar ◽  
Rajeev Kumar ◽  
Mohammad Talha ◽  
Rahul Vaish
Keyword(s):  
Fuzzy Logic ◽  
Vibration Control ◽  
Piezoelectric Material ◽  
Fuzzy Logic Controller ◽  
Piezoelectric Materials ◽  
Active Vibration Control ◽  
Time History ◽  
Smart Structure ◽  
Poling Direction ◽  
Active Vibration

In this article, active vibration control of a piezo laminated smart structure is presented using poling tuned piezoelectric material. To improve the performance of existing materials and utilize the actuation potential of different modes of operation ( d31, d33, and d15), simultaneously, the poling direction of the piezoelectric materials is altered and an optimum poling direction is found. Poling tuned piezoelectric patches at the top and bottom layers of the structure are mounted which act as sensors and actuators, respectively. The computational technique used for calculating the time history of the structure is a finite element method. A fuzzy logic controller is developed to compute the appropriate actuator signal as output while taking sensor voltage and its derivative as input. The controlled response due to this fuzzy logic controller is calculated for different piezoelectric materials under consideration and the performance of these materials in active vibration control is compared. Influence of poling angle on the controlled response of the structure is scrutinized and is found to vary from material to material. A large enhancement due to poling tuning is seen in the properties of Pb(Mg1/3Nb2/3)O3-0.35PbTiO3 (PMN-0.35PT), whereas other materials show very less improvement or even decay in the properties.

Durability on a RCC Structure by using Piezoelectric Material

2017 ◽  
Vol 6 (1) ◽  
pp. 28
Author(s):  
Yadav Praveen Kumar ◽  
Kushwaha Yogita ◽  
◽  
Keyword(s):  
Piezoelectric Material

scholarly journals Ductile failure analysis of epoxy resin plates containing multiple circular arc cracks by means of the equivalent material concept

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
M. Pourseifi ◽  
A. S. Rahimi
Keyword(s):  
Ductile Failure ◽  
Equivalent Material ◽  
Circular Arc ◽  
Equivalent Material Concept ◽  
Crack Tips ◽  
Fracture Tests ◽  
Polymeric Samples ◽  
Cracked Specimens ◽  
Brittle Fracture Criterion ◽  
Material Concept

AbstractDuctile failure of polymeric samples weakened by circular arc cracks is studied theoretically and experimentally in this research. Various arrangements of cracks with different arc angles are considered in the specimens such that crack tips experienced the mixed mode I/II loading conditions. Fracture tests are conducted on the multi-cracked specimens and their fracture loads are achieved. To provide the results, the equivalent material concept (EMC) is used in conjunction of dislocation method and a brittle fracture criterion such that there is no necessity for performing complex and time-consuming elastic-plastic damage analyses. Theoretical and experimental stress intensity factors are computed and compared with each other by employing the fracture curves which demonstrate the appropriate efficiency of proposed method to predict the tests results.

scholarly journals Power-Generation Optimization Based on Piezoelectric Ceramic Deformation for Energy Harvesting Application with Renewable Energy

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2171
Author(s):  
Hyeonsu Han ◽  
Junghyuk Ko
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Energy Harvesting ◽  
Piezoelectric Material ◽  
Lead Zirconate Titanate ◽  
Piezoelectric Ceramic ◽  
Piezoelectric Element ◽  
Piezoelectric Ceramics ◽  
Lead Zirconate ◽  
Piezoelectric Energy

Along with the increase in renewable energy, research on energy harvesting combined with piezoelectric energy is being conducted. However, it is difficult to predict the power generation of combined harvesting because there is no data on the power generation by a single piezoelectric material. Before predicting the corresponding power generation and efficiency, it is necessary to quantify the power generation by a single piezoelectric material alone. In this study, the generated power is measured based on three parameters (size of the piezoelectric ceramic, depth of compression, and speed of compression) that contribute to the deformation of a single PZT (Lead zirconate titanate)-based piezoelectric element. The generated power was analyzed by comparing with the corresponding parameters. The analysis results are as follows: (i) considering the difference between the size of the piezoelectric ceramic and the generated power, 20 mm was the most efficient piezoelectric ceramic size, (ii) considering the case of piezoelectric ceramics sized 14 mm, the generated power continued to increase with the increase in the compression depth of the piezoelectric ceramic, and (iii) For piezoelectric ceramics of all diameters, the longer the depth of deformation, the shorter the frequency, and depending on the depth of deformation, there is a specific frequency at which the charging power is maximum. Based on the findings of this study, PZT-based elements can be applied to cases that receive indirect force, including vibration energy and wave energy. In addition, the power generation of a PZT-based element can be predicted, and efficient conditions can be set for maximum power generation.

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