Acousto-Electromagnetic Interaction in Materials for Aerospace Composites
(2019) EITM01 20182Department of Electrical and Information Technology
- Abstract
- Non-destructive testing (NDT) is a vital part of aerospace manufacturing due to high demands for quality and safety. Advances in materials science have given rise to aerospace composites with highly improved properties compared to traditional materials. To ensure that materials can be used safely, NDT techniques are continuously improved to follow advances in materials. This has also spurred development of new NDT techniques. One suggestion for improving NDT techniques is based on combining several phenomena. One such combination is acoustics and electromagnetics, such as ultrasound and mm-waves. This work explores interaction between acoustic and electromagnetic waves and attempts to connect this with possibilities for novel NDT... (More)
- Non-destructive testing (NDT) is a vital part of aerospace manufacturing due to high demands for quality and safety. Advances in materials science have given rise to aerospace composites with highly improved properties compared to traditional materials. To ensure that materials can be used safely, NDT techniques are continuously improved to follow advances in materials. This has also spurred development of new NDT techniques. One suggestion for improving NDT techniques is based on combining several phenomena. One such combination is acoustics and electromagnetics, such as ultrasound and mm-waves. This work explores interaction between acoustic and electromagnetic waves and attempts to connect this with possibilities for novel NDT techniques. The focus is on photoelastic interaction, meaning that an acoustic wave alters dielectric properties of a medium which in turn scatters electromagnetic waves. Existing techniques such as acousto-optics and Radio Acoustic Sounding System are used as a starting point for exploring this interaction mechanism.
Analytical models for photoelastic interaction are developed from basic electromagnetism and photoelasticity theory. Two important results are a phase matching condition for maximum scattering and a frequency shift of scattered waves, both of which are also present in acousto-optics. Numerical simulations are used to verify the phase matching condition and compare scattering power with analytical models. Defects with electric or acoustic contrast are simulated to explore NDT possibilities. Both types of contrast are shown to affect the interaction, which could be an advantage over some existing NDT techniques. However, more work is required to determine the utility for NDT. (Less) - Popular Abstract
- In the aerospace industry new materials are continuously being developed for their promise in being lighter, stronger and overall better. At the same time it is very important that those materials are reliable since they go into parts which keep the aircraft flying. Because of this, inspection of parts without causing bad effects to the parts themselves is crucial. One possibility for improvement might be in combining such methods.
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/8971446
- author
- Wingren, Niklas LU
- supervisor
- organization
- course
- EITM01 20182
- year
- 2019
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- Non-destructive testing, Ultrasound, mm-waves, Photoelasticity, Multiphysics
- report number
- LU/LTH-EIT 2019-682
- language
- English
- id
- 8971446
- date added to LUP
- 2019-02-18 16:45:07
- date last changed
- 2019-02-18 16:45:07
@misc{8971446,
abstract = {{Non-destructive testing (NDT) is a vital part of aerospace manufacturing due to high demands for quality and safety. Advances in materials science have given rise to aerospace composites with highly improved properties compared to traditional materials. To ensure that materials can be used safely, NDT techniques are continuously improved to follow advances in materials. This has also spurred development of new NDT techniques. One suggestion for improving NDT techniques is based on combining several phenomena. One such combination is acoustics and electromagnetics, such as ultrasound and mm-waves. This work explores interaction between acoustic and electromagnetic waves and attempts to connect this with possibilities for novel NDT techniques. The focus is on photoelastic interaction, meaning that an acoustic wave alters dielectric properties of a medium which in turn scatters electromagnetic waves. Existing techniques such as acousto-optics and Radio Acoustic Sounding System are used as a starting point for exploring this interaction mechanism.
Analytical models for photoelastic interaction are developed from basic electromagnetism and photoelasticity theory. Two important results are a phase matching condition for maximum scattering and a frequency shift of scattered waves, both of which are also present in acousto-optics. Numerical simulations are used to verify the phase matching condition and compare scattering power with analytical models. Defects with electric or acoustic contrast are simulated to explore NDT possibilities. Both types of contrast are shown to affect the interaction, which could be an advantage over some existing NDT techniques. However, more work is required to determine the utility for NDT.}},
author = {{Wingren, Niklas}},
language = {{eng}},
note = {{Student Paper}},
title = {{Acousto-Electromagnetic Interaction in Materials for Aerospace Composites}},
year = {{2019}},
}