Nondestructive evaluation of single fibre debonding in composites by X-ray refraction

Hentschel, Manfred P.; Harbich, Karl-Wolfram; Lange, Axel

doi:10.1016/0963-8695(94)90133-3

Cited by 41 publications

(13 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The error root is from the noise. To remove the effectiveness of noises, we employ (4) to sift the valuable mode and set the threshold to 100 in (4). Three groups of minimal values are kept, meaning three modes are kept.…”

Section: Illustration Of the Presented Algorithmmentioning

confidence: 99%

See 1 more Smart Citation

A Time-Frequency Research for Ultrasonic Guided Wave Generated from the Debonding Based on a Novel Time-Frequency Analysis Technique

Zhang

2017

Shock and Vibration

View full text Add to dashboard Cite

Carbon fibre composites have a promising application in the future of the vehicle, because of their high strength and light weight. Debonding is a major defect of the carbon fibre composite. The time-frequency analysis is fundamental to identify the defect on ultrasonic nondestructive evaluation and testing. In order to obtain the instantaneous frequency and the peak time of modes of the ultrasonic guided wave, an algorithm based on the Smoothed Pseudo Wigner-Ville distribution and the peak-track algorithm is presented. In the algorithm, a masking step is proposed, which can guarantee that the peak-track algorithm can automatically exact the instantaneous frequency and the instantaneous amplitude of different modes on the Smoothed Pseudo Wigner-Ville distribution. An experiment for detecting the debonding for a type of carbon fibre composite is done. The presented algorithm is employed on the experimental signals. The processed result of experimental signals reveals that the defect can stimulate new modes, and there is a quantitative relationship between the defect size and the frequency of the new mode. The presented technique provides a valuable way to detect the presentence, calculate the size, and locate the position of the debonding defect.

show abstract

Section: Illustration Of the Presented Algorithmmentioning

confidence: 99%

“…Debonding defect is a major problem of the carbon fibre composites. A great number of scholars have done investigations of the nondestructive evaluation and testing (NDE/NDT) for the defect [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

A Time-Frequency Research for Ultrasonic Guided Wave Generated from the Debonding Based on a Novel Time-Frequency Analysis Technique

Zhang

2017

Shock and Vibration

View full text Add to dashboard Cite

show abstract

“…The refraction intensity can be measured 3 according to Eqn (3). I Ł R depends on the transmitted intensity I, the thickness d and the inner surface density D NR (N is the number of fibres) of the sample.…”

Section: Physics and Instrumentationmentioning

confidence: 99%

“…Equations for the calculation of individual or collective fibre debonding have been given. 3 Average specific surface densities can be determined by 'stationary' x-ray refractometry. Such analytical investigations can be useful in the field of new materials, when cutting or polishing has to be omitted.…”

Section: Analytical Applicationsmentioning

confidence: 99%

Synchrotron radiation refraction topography for characterization of lightweight materials

Müller

Hentschel

2004

X-Ray Spectrometry

View full text Add to dashboard Cite

The employment of synchrotron radiation for refraction topography of materials has considerable advantages over standard x-ray sources. The much higher beam intensity and the parallel and monochromatic radiation provide faster measurements and better angular and spatial resolution. X-ray refraction techniques image the inner surface and interface concentration of micro-structured materials. This effect of x-ray optics is additional to small-angle scattering by diffraction, when the scattering objects reach micrometre dimensions. We have developed x-ray refraction techniques within the last decade in order to meet the growing demands for improved non-destructive characterization of high-performance composites, ceramics and other low-density materials. Sub-micron particle dimensions, the pore size of ceramics, the crack density distribution and single fibre debonding within damaged composites can be measured and visualized by computer-generated interface topographs. For this purpose investigations are now being performed at the new hard x-ray beamline of the Federal Institute for Materials Research and Testing (BAM) at BESSY, Berlin. This BAMline provides monochromatic radiation of photon energies from 5 to 60 keV from a double multilayer and/or a double-crystal monochromator. A separate instrument is dedicated to the further development and application of synchrotron radiation refraction (SRR) topography. Different from conventional small-angle scattering cameras with collimating slits and pinholes, scattering angles down to a few seconds of arc are selected by a single-crystal analyser, similar to a Bonse-Hart diffractometer. A 20 µm spatial resolution of the scattering micro-structures is achieved by a CCD camera with a fluorescent converter. First SRR topographs of aircraft composites [carbon fibre-reinforced plastics (CFRP), carbon fibre-reinforced ceramics (C/C), metal matrix ceramics (MMC)] will be reported.

show abstract

“…Particle dimensions smaller than 50 nm are determined by 'Guinier' and 'Porod' analysis (diffraction) [3], larger ones by refractometry [4,5]. Similar to WAXS of textured materials, SAXS of fibers and wires reveals their orientation, as they refract Xrays like cylindrical lenses deflect light.…”

Section: Principles Of X-ray Topographymentioning

confidence: 99%

NDE of microstructured materials by x-ray diffraction and refraction topography

Hentschel

Lange

Harbich

et al. 2004

Testing, Reliability, and Application of Micro- And Nano-Material Systems II

View full text Add to dashboard Cite

Abstract. For the purpose of micro structural characterization X-ray topography reveals the spatially resolved scattering of materials and small components. It combines the advantages of radiographic imaging and the analytical information of wide and small angle X-ray scattering like phase distribution, texture, micro cracks, interfaces and pores. Scanning techniques at selected scattering conditions permit the topographic characterization of any crystalline or amorphous solid or liquid. Topographic methods and applications for the purposes of research, quality control and damage evaluation are presented.

show abstract

Nondestructive evaluation of single fibre debonding in composites by X-ray refraction

Cited by 41 publications

References 4 publications

A Time-Frequency Research for Ultrasonic Guided Wave Generated from the Debonding Based on a Novel Time-Frequency Analysis Technique

A Time-Frequency Research for Ultrasonic Guided Wave Generated from the Debonding Based on a Novel Time-Frequency Analysis Technique

Synchrotron radiation refraction topography for characterization of lightweight materials

NDE of microstructured materials by x-ray diffraction and refraction topography

Contact Info

Product

Resources

About