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首页> 外文期刊>SAMPE Journal >Cost-Effective, Phase-Based Thermography Method for Ultrasonic Investigation of Defects in CFRP Structures
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Cost-Effective, Phase-Based Thermography Method for Ultrasonic Investigation of Defects in CFRP Structures

机译：具有成本效益的基于相位的热成像方法，用于超声波研究CFRP结构中的缺陷

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摘要

In recent years nondestructive inspection (NDI) methods have found their way into service in the aerospace and automotive industry. Reliable and sensitive NDI systems often represent high acquisition costs for small and medium-sized companies, which represent a significant fraction of aerospace and the majority of automotive suppliers as well as the whole area of high performance sports equipment. For this reason a new approach in thermographic testing is introduced in this work, which combines the advantages of a robust and cheap NDI system such as heat flow thermography with the defect sensitivity of a high performance NDI method such as Lock-In thermography. The data acquisition and excitation is separated, which together with the use of appropriate data management, analyzing software algorithms and cheap off-the-shelf components leads to an effective 2-D NDI system. A carbon fiber reinforced plastic (CFRP) test plate containing various kinds of defects (delaminations, inclusions, fiber cracks, resin accumulations, etc.) is used to compare this thermographic system with the results of a water-coupled ultrasonic system. It is shown that this system has comparable defect sensitivity and even shows advantages in the detection of overlapped defects while simultaneously reducing the total testing time. Furthermore large defect areas can be inspected very quickly.
机译：近年来，无损检测（NDI）方法已在航空航天和汽车工业中投入使用。可靠且敏感的NDI系统通常代表中小型公司的高昂购置成本，这些公司占航空航天和大部分汽车供应商以及高性能运动器材整个领域的很大一部分。因此，在这项工作中引入了一种新的热成像测试方法，该方法将强大而廉价的NDI系统（如热流热成像）的优点与高性能NDI方法（如锁定热成像）的缺陷敏感性结合在一起。数据采集​​和激发是分开的，再加上适当的数据管理，分析软件算法和廉价的现成组件，共同构成了一个有效的2-D NDI系统。包含各种缺陷（分层，夹杂物，纤维裂纹，树脂堆积物等）的碳纤维增强塑料（CFRP）测试板用于将此热成像系统与水耦合超声系统的结果进行比较。结果表明，该系统具有相当的缺陷敏感性，甚至在检测重叠缺陷方面也显示出优势，同时减少了总测试时间。此外，可以快速检查较大的缺陷区域。

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