Fracture Analysis of Crack Positioned Perpendicular to the Poling Direction in Piezoelectric Material Using XFEM

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.

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Topology Optimization of Energy Harvesting Skin Structure Utilizing Harmonic Vibration

Volume 1: 23rd Biennial Conference on Mechanical Vibration and Noise, Parts A and B ◽

10.1115/detc2011-47097 ◽

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.

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Modeling and Optimization of Novel Actuators Produced by Solid Freeform Fabrication

MRS Proceedings ◽

10.1557/proc-625-159 ◽

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.

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Active vibration control of smart structure using poling tuned piezoelectric material

Journal of Intelligent Material Systems and Structures ◽

10.1177/1045389x20917456 ◽

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.

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