Evaluation of the damage detection capability of a sparse-array guided-wave SHM system applied to a complex structure under varying thermal conditions

A sparse-array structural health monitoring (SHM) system based on guided waves was applied to the door of a commercial shipping container. The door comprised a corrugated steel panel approximately 2.4 m by 2.4 m surrounded by a box beam frame and testing was performed in a nonlaboratory environment....

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control Vol. 56; no. 12; pp. 2666 - 2678
Main Authors: Clarke, T., Cawley, P., Wilcox, P.D., Croxford, A.J.
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.12.2009
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Arrays
Computer Simulation
Containers
Corrugating
Defects
Doors
Equipment Failure Analysis - methods
Exact sciences and technology
Finite Element Analysis
Finite element method
Finite element methods
Fundamental areas of phenomenology (including applications)
Hot Temperature
Materials Testing - methods
Mathematical models
Measurement and testing methods
Models, Theoretical
Performance evaluation
Periodic structures
Physics
Predictive models
Product Packaging - instrumentation
Solid mechanics
Steel
Structural and continuum mechanics
Structural beams
Testing
Transducers
Ultrasonography - methods
Hole
Structure integrity
Detectability
Guided wave
Steel
Modeling
Finite element method
Data acquisition system
Corrugated surface
Thermal compensation
Database
Groove
Signal processing
Acoustic antenna
Transmission mode
Signal analysis
Monitoring
Angle of incidence
Defect detection
Damaging
ISSN:0885-3010, 1525-8955, 1525-8955
Online Access:Get full text
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Summary:A sparse-array structural health monitoring (SHM) system based on guided waves was applied to the door of a commercial shipping container. The door comprised a corrugated steel panel approximately 2.4 m by 2.4 m surrounded by a box beam frame and testing was performed in a nonlaboratory environment. A 3-D finite element (FE) model of the corrugations was used to predict transmission coefficients for the A0 and S0 modes across the corrugations as a function of incidence angle. The S0 mode transmission across the corrugations was substantially stronger, and this mode was used in the main test series. A sparse array with 9 transducers was attached to the structure, and signals from the undamaged structure were recorded at periodic intervals over a 3-week period, and the resulting signal database was used for temperature compensation of subsequent signals. Defects in the form of holes whose diameter was increased incrementally from 1 to 10 mm were introduced at 2 different points of the structure, and signals were taken for each condition. Direct analysis of subtracted signals allowed understanding of the defect detection capability of the system. Comparison of signals transmitted between different transducer pairs before and after damage was used to give an initial indication of defect detectability. Signals from all combinations of transducers were then used in imaging algorithms, and good localization of holes with a 5-mm diameter or above was possible within the sparse array, which covered half of the area of the structure.
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ISSN:0885-3010
1525-8955
1525-8955
DOI:10.1109/TUFFC.2009.1357