Advanced ultrasonic non-destructive testing for damage detection on thick and curved composite elements for constructions
Advanced ultrasonic non-destructive testing for damage detection on thick and curved composite elements for constructions
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DOI：
10.1177/1099636212456861
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发表时间：
2013-01
影响因子：
3.9
通讯作者：
G. M. Revel;G. Pandarese;Alfonso Cavuto-
中科院分区：
文献类型：
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作者：
G. M. Revel;G. Pandarese;Alfonso Cavuto-
在这项工作中，复合材料构件的非破坏性检测的问题与复杂形状的民用建筑和交通基础设施进行了分析。在这些应用中，现有技术的主要挑战与低密度芯材（低于80 kg/m3）和弯曲板的厚夹层的检测有关。在审查了合适的无损检测技术后，提出了一种用于低频（100 kHz）超声波检测的原始设置，该设置结合了穿透传输模式中的不同解决方案。该装置是基于一个混合配置耦合接触发射探头与非接触空气耦合接收器。为了获得足够的能量来分析低密度芯厚的元件，在发射中使用接触探针是必要的。探头和表面之间的接触很小（1 mm的斑点），使用球形帽来增加低频下的横向分辨率，并允许在弯曲部件中有时存在的不规则表面上进行扫描。为了更好地理解，在脉冲回波模式下也使用单探头对该帽进行了测试。接收端的非接触式探头可以更好地检测弯曲和厚的部件，而脉冲回波根本不可行。该系统主要是为工业化生产过程中的生产后检测而开发的，其中可以进行穿透测试。对两个不同样品（一个低密度40 kg/m3的厚夹层、一个50 mm厚的PUR芯和一个弯曲层压板）的结果分析表明，所提出的方法可以有效地检测复杂形状的建筑复合材料，具有令人满意的信噪比（通常SNR > 15 dB）和横向分辨率（2-3 mm）。
In this work, the problem of non-destructive testing on composite components with complex shapes for civil constructions and transport infrastructures is analyzed. In such applications at the state of the art main challenges are related with the inspection of thick sandwiches with low density cores (below 80 kg/m3) and curved panels. After a review of suitable non-destructive testing techniques, an original set-up for low frequency (100 kHz) ultrasonic inspection is proposed, which combines different solutions in through-transmission mode. The set-up is based on a hybrid configuration coupling a contact emitting probe with a non-contact air-coupled receiver. The use of a contact probe in emission is necessary to have enough energy to analyze thick components with low density core. The contact between probe and surface is made small (spot of 1 mm) and smooth using a spherical cap to increase lateral resolution at low frequency and to allow scan on irregular surfaces sometimes present in curved parts. To improve understanding this cap has been tested here also with a single probe in pulse echo mode. The non-contact probe in reception allows a better inspection flexibility on curved and thick components, where pulse echo is not feasible at all. The system is mainly developed for inspection after production in an industrialized production process, where through-transmission testing is possible. The analysis of results on two different samples (one thick sandwich with low density 40 kg/m3, 50 mm thick PUR core and one curved laminate panel) shows that the proposed methods can efficiently inspect construction composites of complex shape with satisfactory signal-to-noise ratio (usually SNR > 15 dB) and lateral resolution (2–3 mm).