Evaluation of defects in composite components using Computed Tomography
- Directorate of Engineering, Defence Research and Development Laboratory, Kanchanbagh, Hyderbad-500 058 (India)
Non Destructive Evaluation (NDE) techniques such as Ultrasonic and X-ray Radiography are not often suitable for Fibre Reinforced Plastic (FRP) composite structures because of its multilayered, anisotropic and heterogeneous nature. X-ray Computed Tomography (CT) generates an image of a thin, cross sectional slice of an object. The CT image represents point by point linear attenuation coefficients in the slice. X-ray Computed Tomography inspection has been carried out on composite components of i) high silica glass phenolic cylindrical liner of 2 mm thick bonded to an aluminum casing of 2 mm thick ii) a dish liner bonded to an aluminum casing. The tomograms revealed the various defects such as debonds, delaminations, voids, foreign inclusions and interply density variations. The linear attenuation coefficients in terms of Hounsfield values (HU) have been measured, compared and correlated on the CT images at the contrasts observed to identify the above defects. The density profile at the location marked differentiates debonds/delaminations from Interply density variations. Images of planes could be cut from 3-D data for mapping delamination/debond. The relative advantages of CT in identifying and analysing the defects over conventional NDE techniques have been brought out.
- OSTI ID:
- 21207702
- Journal Information:
- AIP Conference Proceedings, Vol. 497, Issue 1; Conference: 9. international symposium on nondestructive characterization of materials, Sydney (Australia), 28 Jun - 2 Jul 1999; Other Information: DOI: 10.1063/1.1302066; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
Similar Records
SU-E-T-599: The Variation of Hounsfield Unit and Relative Electron Density Determination as a Function of KVp and Its Effect On Dose Calculation Accuracy
A model-based scatter artifacts correction for cone beam CT