Signal Recognition of Acoustic Emission from Microstrutures in Composite Laminates

碩士 === 國立交通大學 === 機械工程研究所 === 86 === Tliermo-plastic composite materials commonly have weak fiber/matrix bonded strength due to their poor resin penetration. Several micro-defects, including fiber-breakage, fiber/matrix debonding, transverse matrix cracking, are frequently observed in thermo-p...

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Main Authors: Peng, Jen-Chien, 彭人傑
Other Authors: Yin, Ching-Chung
Format: Others
Language:zh-TW
Published: 1998
Online Access:http://ndltd.ncl.edu.tw/handle/31356961487972708780
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spelling ndltd-TW-086NCTU34890252015-10-13T11:06:15Z http://ndltd.ncl.edu.tw/handle/31356961487972708780 Signal Recognition of Acoustic Emission from Microstrutures in Composite Laminates 複材層板微破壞的音洩訊號辨識研究 Peng, Jen-Chien 彭人傑 碩士 國立交通大學 機械工程研究所 86 Tliermo-plastic composite materials commonly have weak fiber/matrix bonded strength due to their poor resin penetration. Several micro-defects, including fiber-breakage, fiber/matrix debonding, transverse matrix cracking, are frequently observed in thermo-plastic composites. Most previous researches characterized acoustic emission (AE) in composites often by temporal parameters. The frequency characteristics were also ignored from AE signals captured by resonant transducers. The propagation of AE waves in composite laminates is complex because of the anisotropy and dispersion. In this study several micro-fractures were induced in large-sized laminates made of glass fiber-reinforced, thermo-plastic composite during well-designed tensile and bending tests. The fractures were monitored by two broadband piezoelectric AE sensors mounted on surfaces of the specimens at 0° and 90° orientations to the fibers. The time-frequency patterns of those AE signals were determined by the continuous wavelet transform. Pattern recognition was carried out by back-propagation neural network through the characteristic parameters in frequency domain. A very good results of the AE signal recognition have been achieved. Yin, Ching-Chung 尹慶中 1998 學位論文 ; thesis 80 zh-TW
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language zh-TW
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description 碩士 === 國立交通大學 === 機械工程研究所 === 86 === Tliermo-plastic composite materials commonly have weak fiber/matrix bonded strength due to their poor resin penetration. Several micro-defects, including fiber-breakage, fiber/matrix debonding, transverse matrix cracking, are frequently observed in thermo-plastic composites. Most previous researches characterized acoustic emission (AE) in composites often by temporal parameters. The frequency characteristics were also ignored from AE signals captured by resonant transducers. The propagation of AE waves in composite laminates is complex because of the anisotropy and dispersion. In this study several micro-fractures were induced in large-sized laminates made of glass fiber-reinforced, thermo-plastic composite during well-designed tensile and bending tests. The fractures were monitored by two broadband piezoelectric AE sensors mounted on surfaces of the specimens at 0° and 90° orientations to the fibers. The time-frequency patterns of those AE signals were determined by the continuous wavelet transform. Pattern recognition was carried out by back-propagation neural network through the characteristic parameters in frequency domain. A very good results of the AE signal recognition have been achieved.
author2 Yin, Ching-Chung
author_facet Yin, Ching-Chung
Peng, Jen-Chien
彭人傑
author Peng, Jen-Chien
彭人傑
spellingShingle Peng, Jen-Chien
彭人傑
Signal Recognition of Acoustic Emission from Microstrutures in Composite Laminates
author_sort Peng, Jen-Chien
title Signal Recognition of Acoustic Emission from Microstrutures in Composite Laminates
title_short Signal Recognition of Acoustic Emission from Microstrutures in Composite Laminates
title_full Signal Recognition of Acoustic Emission from Microstrutures in Composite Laminates
title_fullStr Signal Recognition of Acoustic Emission from Microstrutures in Composite Laminates
title_full_unstemmed Signal Recognition of Acoustic Emission from Microstrutures in Composite Laminates
title_sort signal recognition of acoustic emission from microstrutures in composite laminates
publishDate 1998
url http://ndltd.ncl.edu.tw/handle/31356961487972708780
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