ULTRASONIC-DETECTION OF DAMAGE IN CFRPS
ULTRASONIC-DETECTION OF DAMAGE IN CFRPS
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DOI：
10.1177/002199839502900104
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发表时间：
1995-01-01
影响因子：
2.9
通讯作者：
KACZMAREK, H
中科院分区：
文献类型：
--
作者：
KACZMAREK, H
发展无损检测技术可以很好地了解碳纤维复合材料的损伤过程。 为了提高超声波检测基体裂纹发展的能力，水箱已被直接安装在伺服控制的机器上，并进行了点自动扫描的研究。 已实施更精确的测试程序，包括机械改进、振幅测量精度、负载下的复位点、未损坏和损坏状态之间的衰减的比较评估。 并将X射线和超声结果进行了比较。 另一个目的是控制隐藏的损害，由于影响，特别是测量的大小和形状的分层在每个层间位置使用改进的脉冲回波方法。 因此，对常规设备进行了改进，以便按厚度段探测材料。 一个新的程序已被添加到一个经典的设备提供在一个单一的扫描多个C扫描图像的一个试样具有非常有限的数据量。 本文的主要目的是描述所使用的方法，并讨论已执行的原始程序。 本文主要从裂纹密度测量、拉伸条件下基体裂纹的扩展以及逐层分层的尺寸确定和定位等方面对改进的超声波装置的新功能进行了研究，这些功能使超声波装置在航空领域中得到了广泛的应用：复合材料的改进、湿度对损伤的影响、冲击损伤的检测、结构的寿命等。
A good knowledge on damage processes in CFRPs can be given by developing non-destructive testing. In order to improve ultrasonic capabilities to detect matrix cracking development, a water tank has been mounted directly on a servo-controlled machine and an automatic scanning by points has been investigated. More accurate testing procedures have been implemented including mechanical improvements, amplitude measurement accuracy, resetting points under loading, comparative evaluation of the attenuation between undamaged and damaged state. A comparison between X-ray and ultrasonic results has been made. Another aim was to control hidden damage due to impact and especially to measure the size and shape of delaminations at each interply location using an improved pulse echo method. Hence, conventional equipment has been modified in order to explore the material by thickness segments. A new procedure has been added to a classical equipment providing in a single scan multiple C-scan images of a coupon with a very limited amount of data. The main purpose of this paper is to describe the methods used and to discuss the original procedures that have been performed. The new capabilities of an improved ultrasonic set-up are going to be examined mainly in relation to crack-density measurement, matrix cracking development under tension and ply by ply delamination sizing and location.With these features, an ultrasonic set-up can find its application in many aeronautical fields: improving composites, moisture influence on damage, detecting of damage resulting from impact, structures lifetime.