Flatbed scanner image and single ultrasonic rangefinder technique for composite laminates defect detection

Abstract

Inspection of composite laminates in production line using Ultrasonic C-scan for NDT requires a competent and experience inspector in order to analyze the signal which involve various technical instruction. In this paper, two approaches had been used which are image based approach and signal based approach of ultrasonic C-Scan method for NDT of composite laminate are developed and applied, with the aim to compare and validate both techniques instead of surface defect percentage area. The idea is, to propose an image analysis technique which easy to handle by general worker either the defect percentage area between the image and signal analysis are acceptable range or not. Composite laminates 6 plies which produced in-house with geometry 280 mm length x 80 mm width x 2 mm thickness was drilled to consider as defect area. Then, further analysis was performed using image scanning and processing to calculate the percentage of the defect area before we proceeds to the ultrasonic signal based approach. This research had been successfully done with the maximum and the minimum yield percentage between image processing and ultrasonic signal based approach method are 17.12 percent and 8.52 percent.

Nondestructive inspection of aerospace composite laminate using thermal image processing

“…Jeong et al [27] applied this methodology in maritime images. Mahmod et al [28] studied a composite laminate panel with its ROIL of intensities through a defect area and a good area. But they have not applied it on the thermal images of composite laminates having de-bonds.…”

Motion Analysis of A Low Cost Customized A-Scan Non Destructive Testing Unit

“…At last, the efficiency of the stepper motor roughly at 28 %. According to the previous researcher [4], the efficiency of the stepper motor is very low since the purpose for smooth motion and higher torque instead of speeding. So, it will show the load that attach on the thread of motor not effecting the performance itself.…”

Fiber Glass Composite Laminates (Fgcl) Measurement Using 3 Axis Pulse Echo Scanning Unit

“…In addition, T. Hasiotis et al [6] used Ultrasonic C-scan approach to determine artificial defect on laminated composite material. On the other hand M. F. Mahmod et al [7] compared an artificial defect of laminated composite material using both signal data acquisition and flatbed scanning result while T. Y. Lim et al [8] use flatbed scanning approach to measure the nose radius of cutting insert. The use of thermography on impacted glass fiber reinforced polymer also being studied by C. Meola et al [9] while some researcher used 3D laser vibrometry to locate delamination on composite plate as performed by W. J. Staszewski et al [10].…”