Date of Award

8-16-2024

Document Type

Open Access Thesis

Department

Mechanical Engineering

First Advisor

Sourav Banerjee

Abstract

This work presents the use of Peri-Elastodynamic, a guided wave simulation method based on meshfree non-local Peridynamics theory. To model simultaneous crack and wave propagation simulation and its application on Acoustic Emission (AE) signal modelling, a new formulation is presented. The field of nondestructive evaluation (NDE) and structural health monitoring (SHM) is slowly embracing the advancement in Machine Learning (ML) / Artificial Intelligence (AI) for better and cost-effective assessment of structures and damage prediction. AI/ML can revolutionize the NDE/SHM field by automating the data collection and analyzing processes. However, the big challenge is that the model needs a sheer amount of data to be trained. Structural damages can have infinite possibilities and generating these data experimentally is impossible. “It is neither feasible nor cost effective to generate experimental data with all possible damage scenarios” especially when the loading rate on the structure is dynamically changing. This challenge can be overcome by producing data from simulated damage in the materials and structures. Use of Peri-Elastodynamic has great opportunities in Ultrasonics NDE research as it can predict the physics of discontinuities accurately being an integral based approach. Although three-dimensional (3D) guided Lamb wave can be simulated using Peri-Elastodynamic, major areas of ultrasonic guided wave propagation are still unexplored. First, this thesis surveys the literature and performs an extensive review of all the research on wave mechanics using Peridynamic. The articles are then quantitatively analyzed to find the limitations, application guidelines and outcomes of state-of-the-art Peridynamic wave propagation simulation. Next, simultaneous crack and wave propagation simulation is unified into one computer code using Peri-Elastodynamic 3D guided Lamb wave simulation. This approach implements Bond-based peridynamic theory for isotropic materials. Although the load application for crack propagation and signal excitation for wave propagation varies significantly in time scale (so does in for particle displacement), it is now possible for the first time to visualize them in a single simulation environment with the use of Peri- Elastodynamic. This computer program is then implemented to simulate Acoustic Emission signal propagation for crack growth due to external load. This program now can help to model and visualize AE signal generation due to different damage growth phenomenon such as crack growth, crack clapping, corrosion damage etc. Hence, Peri-Elastodynamics has been proved to be an effective tool for data generation and visualization for Ultrasonics based NDE.

Rights

© 2024, Md Mushfiqur Rahman Fahim

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