Title: Cementitious Acoustic Bandgap Sensors for Smart Damage Detection

Author(s): Shreya Vemuganti

Publication: Web Session

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Date: 3/28/2022

Abstract:
Development and propagation of cracks in cementitious materials in wellbores raise concerns about wellbore integrity. Engineering acoustic bandgaps (ABG) in cementitious materials can offer a new method for advanced structural health monitoring in wellbores where accessibility is challenging. ABG sensors made of cement and multi-walled carbon nanotubes inclusions with wide partial and complete bandgaps were designed, fabricated, and tested. Our experimental investigations confirmed the observation of wide bandgaps at 300-600 kHz in cement specimens incorporating the ABG sensor. A computational model using the finite element method was developed and validated using the experimental observations. We demonstrate using the computational model the effect of elastic and plastic deformations in the cement environment surrounding the ABG sensor, due to damage and microcracking, on the acoustic response of the ABG sensor. We also show that changes in the bandgap signatures can be observed and used to infer damage in the ABG sensor's cement environment.