Session: 10-01: Nonlinear Ultrasonic Techniques for NDE I

Paper Number: 137228

137228 - Peridynamics Based Modeling for Investigating the Effect of Topography and Topological Acoustic Sensing Performance in Monitoring Damage Growth 

Abstract: 

A newly developed nonlinear ultrasonic (NLU) technique called sideband band peak count-index (or SPC-I) has shown many advantages for monitoring damages in different materials such as concrete, fiber reinforced polymer composite, metals, fiber reinforced cement mortar and additively manufactured metal parts. In the SPC-I technique, sideband peaks are counted above a moving horizontal threshold line as this line varies between a preset lower limit and an upper limit in the spectral plots. The SPC-I values measure the degree of nonlinearity associated with the inspected specimen – larger SPC-I values indicate higher nonlinearity. In various published papers, the SPC-I technique has shown its effectiveness and superiority compared to other techniques for nondestructive testing (NDT) and structural health monitoring (SHM) applications. Evolution of damage from crack initiation to failure can be monitored effectively by the SPC-I technique because it can detect the dislocation and micro-crack generation as well as macro-crack formation from coalescing of micro-cracks.  The performance of SPC-I in non-homogeneous specimens having different topographies is investigated using peridynamics based peri-ultrasound modeling.  It is observed that some topographies can help to hide the crack growth. It is then studied if topological acoustic sensing using geometric phase concept can improve the crack sensing and/or the acoustic wave’s anomaly bypassing capability.   

Presenting Author: Tribikram Kundu University of Arizona

Presenting Author Biography: Scientist at the University of Arizona

Authors:

Guangdong Zhang University of Arizona
Pierre A. Deymier University of Arizona
Keith Runge University of Arizona
Tribikram Kundu University of Arizona