Indicator kriging for damage position prediction by the use of electromechanical impedance-based structural health monitoring

Daniel Resende Gonçalves,José Dos Reis Vieira De Moura Jr,Paulo Elias Carneiro Pereira,Marcos Vinícius Agapito Mendes,Henrique Senna Diniz-Pinto

doi:10.5802/crmeca.81

Abstract

Some nondestructive techniques of the Structural Health Monitoring (SHM) have improved their analysis in the past decades. Among them, the electromechanical impedance-based SHM technique (EMI-SHM) has been tested in several fields and associated to different statistical methodologies. Considering the nature of the spatial variation of the damage metric data along structures, herein is proposed the use of the indicator kriging method for predicting the existence of a known damage located in the center of an aluminum plate. Maps showing the probability of the damage metric to fall in several value ranges were capable of outlining the areas affected by the damage and predict its location. Comparisons between scenarios with different spacing between PZT patches showed a reduction in the reliability of the model with the increasing of such spacing. Also, for the structure under study, it demonstrates that it is not possible to obtain results by the methodology for distance between sensors/actuators greater than 16.67 cm. However, the results show that this approach can be a viable alternative for using damage metrics to map regions affected by damage and its location.

Highlights

Structures and/or machineries operate under severe mechanical conditions, and are subjected to environmental ones, such as temperature, humidity, and/or chemical [1]
The presence of low damage metric values can be seen by the quartiles, which shows that 50% of the data are lower than 0.6; 25% are between 0.6 and 1.9; and only 25% are higher than 1.9
The experimental semivariograms showed that the preferential directions of continuity were the North–South (Azimuth 0°) and East–West (Azimuth 90°), where the first was the direction of highest continuity for the thresholds 1 and 3, while in the other thresholds, there was not observed any anisotropy (Table 1)

Summary

Introduction

Structures and/or machineries operate under severe mechanical conditions (static and/or dynamic loadings), and are subjected to environmental ones, such as temperature, humidity, and/or chemical [1]. Electromechanical impedance-based SHM technique (EMI-SHM) is of special interest due to its low cost in relation to the other ones, and its nondestructive character. This approach has been applied in several situations and purposes, such as pipelines [2, 3], aircraft structures [4,5,6,7,8], hardened cement pastes or concrete structures [9,10,11,12,13,14,15], composite materials [16, 17], and steelmade objects or structures [18]. Several approaches are in development for the damage’s localization

Methods

Results

Conclusion