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Application of ultrasonic guided waves for non-destructive testing of defective CFRP rods with multiple delaminations

机译:超声波引导在有缺陷的CFRP棒的多次分层无损检测中的应用

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摘要

One of the most important parts of gliders is a lightweight longeron reinforcement made of carbon fibre reinforced plastic (CFRP) rods. During manufacturing, in order to build the arbitrary spar profile, these small diameter (few millimetres) rods are glued together into epoxy filled matrix. Still, defects present in the rods, such as break of fibres, multiple delaminations due to lack of bonding and reduction in density affect construction strength markedly and are extremely complicated to eliminate. Therefore, appropriate non-destructive testing techniques intended for carbon fibre rods should be applied prior to gluing them together.rnThe aim of the present paper is to analyse development possibilities of NDT technique based on application of ultrasonic guided waves and intended for CFRP rods that are used for aerospace applications and are defective with multiple delaminations.rnThe regularities of ultrasonic guided wave propagation in a defective CFRP circular-shape rod with multiple delaminations have been investigated using 3D numerical simulations, finite difference and finite element models. The corresponding experiments have been conducted as well. Based on leaky wave suppression over a defective region due to the weak vertical component of particle displacements, the mechanism of guided wave interaction with the region of multiple delaminations is explained from the ultrasonic NDT viewpoint.
机译:滑翔机最重要的部分之一是由碳纤维增强塑料(CFRP)杆制成的轻质纵梁增强件。在制造过程中,为了建立任意的翼梁轮廓,将这些小直径(几毫米)的杆粘合在一起,形成环氧树脂填充的基体。仍然存在于杆中的缺陷,例如纤维断裂,由于缺乏粘结和密度降低而引起的多次分层明显影响了建筑强度,并且消除起来非常复杂。因此,在将碳纤维棒胶合在一起之前,应先采用适用于碳纤维棒的适当的非破坏性测试技术。本文的目的是分析基于超声波导波的无损检测技术的发展可能性,并将其用于碳纤维增强塑料棒。使用3D数值模拟,有限差分和有限元模型研究了具有多个分层的CFRP圆形缺陷棒中超声导波传播的规律。还进行了相应的实验。基于由于颗粒位移的垂直分量较弱而在缺陷区域上进行的泄漏波抑制,从超声NDT的角度解释了导波与多个分层区域相互作用的机理。

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