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Analysis of damage mechanisms in drilling of composite materials by acoustic emission

机译：声发射复合材料钻削中的损伤机理分析

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摘要

Conventional methods for analysis of drilling of composite materials usually study the amount of damaged area and effective parameters. However, these methods do not provide investigators with sufficient information regarding drilling-induced damage. In this paper, a procedure for discrimination and identification of different damage mechanisms based on the analysis of acoustical signals emitted during the process is presented. Using principle component analysis for data reduction and unsupervised pattern recognition analysis, the drilling process was divided into three main stages, i.e. entry stage, cutting stage and exit stage. Different methods of signal processing were then used to identify and discriminate the most active damage mechanisms in each stage. As a result, matrix cracking, delamination, fiber pull out and friction were discriminated and the frequency distribution of each one was identified. (C) 2015 Elsevier Ltd. All rights reserved.
机译：分析复合材料钻孔的常规方法通常研究损坏区域的数量和有效参数。但是，这些方法不能为研究人员提供有关钻井引起的损害的足够信息。本文提出了一种基于对过程中发出的声信号进行分析的判别和识别不同损伤机理的程序。使用主成分分析进行数据约简和无监督模式识别分析，将钻井过程分为三个主要阶段，即进入阶段，切割阶段和退出阶段。然后使用不同的信号处理方法来识别和区分每个阶段中最活跃的破坏机制。结果，区分了基体开裂，分层，纤维拉出和摩擦，并确定了每个基体的频率分布。 （C）2015 Elsevier Ltd.保留所有权利。

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