Correlation of Acoustic Emission with Fractography in Bending of Glass–Epoxy Composites

被引：0

作者：

Maciej Panek

Stanislaw Blazewicz

Krzysztof J. Konsztowicz

机构：

[1] Wroclaw University of Science and Technology,Department of Mechanics, Materials and Biomedical Engineering

[2] AGH University of Science and Technology,Faculty of Materials Sci. and Ceramics

[3] ATH University of Bielsko-Biala,Department of Matl’s, Civil and Environm. Eng.

来源：

Journal of Nondestructive Evaluation | 2020年 / 39卷

关键词：

Micro-crack initiation; Debonding; Acoustic emission; Historic index; Step-load;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Damage processes in glass fiber reinforced plastic composites have been examined extensively by many analytical and experimental methods, including acoustic emission. While damage phenomena in mezo- and macro-scale are well described, the subtle mechanisms in micro-scale are still under discussion. The goal of this work was to apply the acoustic emission to examine damage initiation in fiber reinforced epoxy resin composites with different continuous glass-fiber architectures. Basic lay-ups were used: unidirectional, cross-ply and angle-ply, each with varying fiber volume content in epoxy matrix. Detection of fine micro-cracks was possible owing to merging the mechanical monotonic and step-load tests in 4-point bending with acoustic emission monitoring and detailed scanning electron microscopy observations. Clear images of macroscopically undamaged samples after interruption of step-loading cycles revealed the initiation of micro-cracks by debonding of fiber-matrix interfaces, in agreement with acoustic emission signal analyses, featuring use of historic index and rise time/amplitude ratio.

引用

共 97 条

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