The multi-layer welding structure is a kind of important weld component used in modern aviation industry. In order to control the quality of the inner welds, the method of ultrasonic immersion testing with focusing probe has been performed in this study. Some testing signals displayed in the screen are overlapping signals composed by the echoes with different propagation routes in the multi-lay...

A new approach is presented in this paper to use Higher Order Statistics (HOS) to deconvolve the effects of blurring in ultrasonic C-Scans. The quantization effects of the mechanical scan-grid and due to the conversion of 1-D A-scan into one pixel on the image cause blurring. The proposed approach is completely blind to the source or the type of distortion and the formulation is purely two-dime...

The broadband narrow pulse self-focusing ultrasonic transducer was designed for the special structure of the column holes, and used to do the research for the testing of bonding layer of metal composite material with F-scan ultrasonic imaging system. The copper-steel boding layer of bimetal rotor is connected by diffusing welding. There may be delamination flaws existed here. The depth and rang...

The present paper investigated the impact and compression after behavior of thin carbon fiber epoxy plates manufactured from prepreg platelet molding compound (PPMC) with two different discontinuous length, 25.5 mm 12.7 mm, compared it continuous quasi-isotropic composite laminate a similar plate thickness. results dynamic testing showed that PPMC/12.7 exhibited larger amount absorbed energy, w...

In ultrasonic defectoscopy it is very difficult to detect flaw in materials with coarse-grain structure. The ultrasonic signals measured on these materials contain echoes which are very similar to fault echo. These echoes arise from grains which are contained in material. For detection of flaw various methods for suppressing of echoes from grains have to be used. In this work we used the method...

With increased use of composite materials in critical structural applications it is more important than ever to independently assure structural integrity. Complexity of the advanced composite materials including layered and bonded structures represents challenges in developing optimized ultrasonic tests. Traditional ultrasonic NDT methods are inappropriate and often misleading when applied to a...

Carbon fibre reinforced polymer (CFRP) structures are widely used in the aerospace industry for their low weight and strong mechanical properties. However, they prone to impact damage due brittle nature. Edge Illumination X-ray Phase Contrast imaging (EI XPCi), a novel, phase-based technique, was compared against two established non-destructive evaluation methods detection CFRP plates. Planar E...