Damage detection in piezoceramics via BEM

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外文摘要：Piezoelectric ceramics have recently become one of the most used materials in all kinds of electromechanical systems. However, the presence of defects in such materials prevents them from fulfilling their function. A number of numerical, analytical and experimental works are recently being developed to understand the behaviour of piezoelectrics with presence of damage, but very few aimed at locating defects. One of the current challenges in monitoring piezoelectrics is the correct interpretation of the readings from sensors, in order to reliably recover the defect characteristics minimizing uncertainties due to noise and model. An inverse problem strategy is proposed for this reconstruction, starting from the electromechanical response measurement as input data, and incorporating a numerical model that simulates that response. This model is solved using a Boundary Element Method (BEM), whose formulation is developed for the 2D static case. The damage identification inverse problem is solved using genetic algorithms for the minimization of the discrepancy or cost functional. The effect of noise on measurements and uncertainties in the model is studied in detail through a sensitivity analysis for some simple cases of defect.

外文关键词：

piezoelectricsdamage identificationinverse problemboundary element methodgenetic algorithms

作者：

G. Rus、F. Garcia-Sanchez、A. Saez、R. Gallego

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作者单位：

Mecanica de Estructuras e Ingenieria Hidraulica, ETS Ingenieria de Caminos, Canales y Puertos Universidad de Granada, Campus Fuentenueva, 18071 Granada (Spain)

Ingnieria Civil, de Materiales y Fabricacion. ETS ingenieria industrial, Universidad de Malaga Campus de El Ejido s/n, 29013 Malaga (Spain)

Mecanica de Medios Continuos, Teoria de Estructuras e Ingenieria del Terreno ETS de Ingenieros, Universidad de Sevilla Camino de los descubrimientos s/n, 41092 Sevilla (Spain)

出版年：

2010

Key engineering materials

ISSN：1013-9826

年,卷(期)：2010.417/418