Detection and imaging of local ply angle in carbon fiber reinforced plastics using laser ultrasound and tilt filter processing

被引：29
作者：
Ambrozinski, L. [1 ]
Mrowka, J. [1 ]
O'Donnell, M. [2 ]
Pelivanov, I. [2 ]
机构：
[1] AGH Univ Sci & Technol, Al Mickiewicza 30, PL-30059 Krakow, Poland
[2] Univ Washington, Dept Bioengn, Seattle, WA 98195 USA
来源：
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2019年 / 126卷
关键词：
Carbon fibers; Directional orientation; Non-destructive testing; Ultrasonics; COMPOSITE-MATERIALS; WAVE-PROPAGATION; CFRP COMPOSITES; ORIENTATION; DAMAGE; ALIGNMENT; SPECTROSCOPY; MISALIGNMENT; ATTENUATION; SIMULATION;
D O I：
10.1016/j.compositesa.2019.105581
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Wrinkles in carbon-fiber reinforced plastics (CFRP) are extremely dangerous, dramatically changing the performance of a composite structure. However, wrinkles are one of the most difficult defects to detect and characterize with ultrasound since they do not produce large echoes like other flaws. Recent developments in laser-ultrasound (LU) have enabled non-contact, high-resolution imaging of CFRPs, providing sub-ply resolution and detailed visualization of CFRP structures. In this paper, we demonstrate that the superior resolution of LU systems can be used to help track ply orientation variations in composites. To improve the signal-to-noise ratio of LU generated signals, we propose a local cross-correlation based tilt-filtration procedure for coherent spatial signal averaging that accounts for the shape of subsequent layers. In addition, local ply angle is a straightforward output of the proposed processing, which can be used directly as an indicator of wrinkle severity.
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页数：11
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