Investigation of defects in honeycomb sandwich structures

The use of the mechanical impedance method for non-destructive testing and analysis of honeycomb structures is described in this thesis. Mechanical impedance instruments, MIA 3000, Versiscan and VP 200, were used to study the detachment of honeycomb structures on specimens which were made of two lay...

Full description

Saved in:
Bibliographic Details
Main Author: Jiang, Li
Other Authors: Low, Seow Chay
Format: Theses and Dissertations
Language:English
Published: 2009
Subjects:
Online Access:http://hdl.handle.net/10356/19882
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-19882
record_format dspace
spelling sg-ntu-dr.10356-198822023-03-11T17:38:05Z Investigation of defects in honeycomb sandwich structures Jiang, Li Low, Seow Chay School of Mechanical and Production Engineering DRNTU::Engineering::Mechanical engineering::Control engineering The use of the mechanical impedance method for non-destructive testing and analysis of honeycomb structures is described in this thesis. Mechanical impedance instruments, MIA 3000, Versiscan and VP 200, were used to study the detachment of honeycomb structures on specimens which were made of two layers of thin aluminium skins with Nomex honeycomb cores. Both tumerical and experimental studies showed that the resonance frequency of a defected area was lower than that of the perfectly bonded area. It was concluded that the resonance frequency could be used to detect the defected area in a honeycomb structure. By varying the test frequencies, one could obtain different amplitudes or phases of impedance. With low test frequency, defected areas can be clearly identified by the marked amplitude variation. The test frequency which was slightly lower than the resonance frequency of the perfectly bonded area gave the best results. However, with test frequency higher than the resonance frequency of the perfectly bonded area, both the amplitude and phase of impedance were unable to show the defect effectively. Master of Engineering (MPE) 2009-12-14T07:04:57Z 2009-12-14T07:04:57Z 1994 1994 Thesis http://hdl.handle.net/10356/19882 en Nanyang Technological University 172 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Mechanical engineering::Control engineering
spellingShingle DRNTU::Engineering::Mechanical engineering::Control engineering
Jiang, Li
Investigation of defects in honeycomb sandwich structures
description The use of the mechanical impedance method for non-destructive testing and analysis of honeycomb structures is described in this thesis. Mechanical impedance instruments, MIA 3000, Versiscan and VP 200, were used to study the detachment of honeycomb structures on specimens which were made of two layers of thin aluminium skins with Nomex honeycomb cores. Both tumerical and experimental studies showed that the resonance frequency of a defected area was lower than that of the perfectly bonded area. It was concluded that the resonance frequency could be used to detect the defected area in a honeycomb structure. By varying the test frequencies, one could obtain different amplitudes or phases of impedance. With low test frequency, defected areas can be clearly identified by the marked amplitude variation. The test frequency which was slightly lower than the resonance frequency of the perfectly bonded area gave the best results. However, with test frequency higher than the resonance frequency of the perfectly bonded area, both the amplitude and phase of impedance were unable to show the defect effectively.
author2 Low, Seow Chay
author_facet Low, Seow Chay
Jiang, Li
format Theses and Dissertations
author Jiang, Li
author_sort Jiang, Li
title Investigation of defects in honeycomb sandwich structures
title_short Investigation of defects in honeycomb sandwich structures
title_full Investigation of defects in honeycomb sandwich structures
title_fullStr Investigation of defects in honeycomb sandwich structures
title_full_unstemmed Investigation of defects in honeycomb sandwich structures
title_sort investigation of defects in honeycomb sandwich structures
publishDate 2009
url http://hdl.handle.net/10356/19882
_version_ 1761781300041089024