Monday  |  Salon 10  |  02:00 PM–02:20 PM

#16897–Strain-based Damage Localization on Plate Structures using Cross-domain Hybrid Expansion Method

Vibration qualification tests are performed to validate the specifications of manufactured products and assemblies. Defects or damages within a structure can result in an apparent change to the dynamic response of the system. Typical damage detection methods use changes in displacement responses as an indication of damage. However, displacement is relatively insensitive to minor structural variations. Strain-based damage detection methods are more sensitive to minor structural variations but regularly suffer from poor resolution which hinders their detection capabilities.

To improve on the damage detection process, a strain-based technique has been developed that uses a cross-domain approach within the expansion process. This expansion method incorporates both strain-based mode shapes and displacement-based mode shapes obtained from either a finite element model (FEM) or experimental modal data. In this work, a simulated plate-like structure with localized structural modifications is excited to obtain sparse displacement measurements. Sparse displacements are then used to obtain the full-field strain response which is compared to the simulated strain response of the undamaged structure subjected to an equivalent excitation. Differences between the damaged and undamaged strain responses are then analyzed in the time domain to identify and localize damage within the structure.

Brett Daniels   University of Massachusetts Lowell
Alessandro Sabato   University of Massachusetts Lowell
Peter Avitabile   University of Massachusetts Lowell
Raymond Joshua   Kansas City National Security Campus