Jasiūnienė Elena, Mažeika Liudas, Samaitis Vykintas, Cicėnas Vaidotas, Mattsson David
Ultrasound Institute, Kaunas University of Technology, Kaunas, Lithuania.
Ultrasound Institute, Kaunas University of Technology, Kaunas, Lithuania.
Ultrasonics. 2019 May;95:13-21. doi: 10.1016/j.ultras.2019.02.009. Epub 2019 Feb 28.
Ultrasonic inspection is widely used for non-destructive evaluation of composite adhesive joints. However, there are serious challenges in applying ultrasonic testing on metal to composite hybrid joints, because they are multi-layered, made out of dissimilar materials and relatively thin. The ultrasonic signals reflected by different layers are overlapped, scattered and attenuated. The aim of this research was to develop an ultrasonic inspection technique suitable for defect detection in hybrid metal to composite joints where the metal part has pin arrays, which entangle with the composite part. The immersion pulse echo technique was used to collect data. In order to overcome the problems related to the rough surface and non-parallel layers a novel signal post-processing algorithm for reconstruction of the joint area was developed and validated experimentally. It is shown that using the proposed technique the positions of different defects can be determined.
超声检测广泛应用于复合胶粘剂接头的无损评估。然而，在对金属与复合材料混合接头进行超声检测时存在严峻挑战，因为它们是多层的，由不同材料制成且相对较薄。不同层反射的超声信号相互重叠、散射并衰减。本研究的目的是开发一种适用于检测混合金属与复合材料接头中缺陷的超声检测技术，其中金属部分具有销阵列，与复合材料部分相互缠绕。采用浸入式脉冲回波技术收集数据。为了克服与粗糙表面和非平行层相关的问题，开发了一种用于重建接头区域的新型信号后处理算法，并通过实验进行了验证。结果表明，使用所提出的技术可以确定不同缺陷的位置。
