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Numerical field intensity factor calculations for 1-3 piezocomposite structures.

Etienne Closset¹, Phillipe Trompette, Alain Birer

¹French National Institute of Health and Medical Research, Lyon. closset@lyon.inserm.fr

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|November 10, 2006

Summary

A new numerical tool analyzes high stress in piezocomposite transducers used for medical treatments like lithotripsy. This method helps predict potential material failures under intense electrical impulses.

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Area of Science:

Materials Science
Biomedical Engineering
Solid Mechanics

Background:

1-3 piezocomposite transducers are crucial for medical applications such as lithotripsy.
These transducers experience high-stress levels due to intense electrical excitation.
Understanding and predicting material failure is essential for device reliability.

Purpose of the Study:

To propose a numerical tool for analyzing singular stress fields in piezocomposite structures.
To compute singularity parameters and intensity factors for mechanical stresses and electrical fields.
To investigate stress concentrations in bimaterial configurations.

Main Methods:

A finite-element iterative method is employed for analysis.
Commercial finite-element analysis software is utilized.
Singularity parameters and intensity factors are computed for mechanical and electrical fields.

Main Results:

The study successfully computed singularity parameters and intensity factors.
Analysis was performed on several bimaterial configurations.
The proposed numerical tool provides insights into stress distribution.

Conclusions:

The developed numerical tool is effective for analyzing singular stress fields in piezocomposites.
This analysis aids in understanding failure mechanisms in high-stress applications.
The findings contribute to the design and safety of medical devices utilizing piezocomposite transducers.