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The nondestructive evaluation of the GFRP composite plate with an elliptical hole under fatigue loading conditions

机译：疲劳载荷条件下带椭圆孔的GFRP复合板的无损评估

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The accurate assessment of the fatigue strength for structures made of composite materials is difficult because of the great number of possible failure forms. The Structural Health Monitoring (SHM) systems are developed and applied in engineering structures for permanent monitoring the state of the constructions. In this paper the Lamb wave propagation method and the infrared thermography were applied to observe the fatigue damage evolution in the multilayered composite plate with an elliptical hole in the middle. The active pitch-catch measurement technique was introduced based on the surface mounted piezoelectric transducers. The localization of the piezoelectric actuator and sensors responsible for excitation and detection of the elastic wave was chosen based on the progressive failure analysis applied in finite element method. The multipoint measuring system was responsible for analysis of the elastic wave propagation phenomenon during the fatigue tests. The sequential measurement of the elastic wave parameters allow one to observe the state of the structure. The different parameters describing the wave propagation phenomenon like amplitude and time of flight was considered. The infrared thermography make possible of detection of the damage initiation and permanent monitoring of the structure. The measurement of the temperature distribution is straightforward and doesn’t need complicated algorithms and software. Application of the coupled approach to the damage detection (piezoelectric transducers in SHM system with the permanent surface temperature monitoring) allow one to build cost effective system for detection of the damage initiation and for monitoring failure form evolution.
机译：由于存在大量可能的破坏形式，因此很难准确评估由复合材料制成的结构的疲劳强度。开发了结构健康监测（SHM）系统，并将其应用在工程结构中，用于永久监测建筑的状态。本文采用兰姆波传播法和红外热成像法观察了中间有椭圆孔的多层复合板的疲劳损伤演化。基于表面贴装的压电换能器，介绍了有源音高捕获测量技术。基于有限元方法中的渐进式失效分析，选择了压电激励器和负责激励和检测弹性波的传感器的定位。多点测量系统负责疲劳测试过程中弹性波传播现象的分析。弹性波参数的顺序测量允许人们观察结构的状态。考虑了描述波传播现象的不同参数，例如振幅和飞行时间。红外热像仪可以检测损坏的开始并永久监控结构。温度分布的测量非常简单，不需要复杂的算法和软件。耦合方法在损伤检测中的应用（SHM系统中的压电换能器具有永久性的表面温度监测功能）使人们可以构建一种经济高效的系统，用于检测损伤的始发并监测失效形式的演变。

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