Detection of debonding in composite-aluminum joints using gamma-ray Compton scattering

Jama, Hassan A.; Hussein, Esam M.A.; Lee‐Sullivan, Pearl

doi:10.1016/s0963-8695(97)00029-7

Cited by 15 publications

(9 citation statements)

References 6 publications

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“…Direct damage detection methods include, among others, X-ray, 3 gamma-ray radiography, 4 ultrasonic probes, laser ultrasound, 5,6 thermography, 7 and microwave electromagnetic imaging. 8 In addition, acoustic techniques such as low power impulse radar, acoustic emission, and elastic wave emitter-detector pairs are in use.…”

Section: Introductionmentioning

confidence: 99%

A multiresolution approach for damage detection in fiber-reinforced polymer pipe systems

El-Gebeily

Khulief

Ghneim

2016

Advances in Mechanical Engineering

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Many industries are increasingly relying on composite pipes for their known favorable characteristics of corrosion resistance, high strength-to-weight ratio, and better insulation. The internal surface damage due to flow-accelerated erosion in pipeline systems poses a challenging problem that initiated a greater demand for reliable early detection methods. In this investigation, an efficient and accurate detection scheme of internal surface damage in a pipe system has been developed. The methodology relies on the measured vibration modal characteristics and is equally applicable to both steel and composite piping systems. The detection model is formulated using B-spline scaling function with their multiresolution capabilities being invoked for zooming on the localized discontinuity caused by internal wall thinning. The developed scheme does not require the prior buildup of a database of modal shifts against the damage parameters. The numerical efficiency of the method is manifested by solving a decoupled linear system, for which all required matrices are calculated and stored only once. Numerical examples are presented to demonstrate the validity and reliability of the developed detection scheme.

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Section: Introductionmentioning

confidence: 99%

A multiresolution approach for damage detection in fiber-reinforced polymer pipe systems

El-Gebeily

Khulief

Ghneim

2016

Advances in Mechanical Engineering

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“…[3][4][5][6] Various non-destructive evaluation (NDE) techniques have been studied to detect damage and cracks in composite materials such as X-ray 7 and gamma-ray radiography. 8 In addition, acoustic techniques such as ultrasonic probes, laser ultrasound, 9,10 low-power impulse radar, acoustic emission, and elastic wave emitter-detector pairs have been also used. Moreover, thermography 11 and microwave electromagnetic imaging 12 have been employed to investigate the damage in composite structures.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, thermography 11 and microwave electromagnetic imaging 12 have been employed to investigate the damage in composite structures. However, the available non-destructive testing (NDT) methods have difficulties associated with their application in the field, as reported for radiography-based techniques, 7,8 ultrasonic tomography 13 and for infrared thermography. 14 In addition, the available NDT methods have limitations with respect to area of coverage, large thickness, and interpretation of their measurements.…”

Section: Introductionmentioning

confidence: 99%

Modal frequencies of fiber-reinforced polymer pipes with wall-thinning using a wavelet-based finite element model

Khulief

El-Gebeily

Oke

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part C:

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Wall-thinning due to chemical reactions, heat, erosion, or a combination of such influences is the most dominant type of internal surface damage in piping systems. In order to examine the effect of wall-thinning on the natural frequencies, the elastodynamic model of the fiber-reinforced polymer pipe is formulated using a wavelet-based finite element method. In this context, a new set of Hermite shape functions is developed. The generalized eigen value problem is solved and the natural frequencies are obtained for an fiber-reinforced polymer pipe with different depths and locations of the wall-thinning. Moreover, the effect of wall-thinning on the modal frequencies of the pipe was verified experimentally. Both the analytical and experimental results demonstrate the potential of using vibration signature to detect internal surface damage in fiber-reinforced polymer pipes.

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“…Radiography technique is one of the oldest NDE techniques. 1,2 Radiography is a photographic record produced by the penetration of electromagnetic radiation such as X-rays and gamma rays through the inspected object onto a film or other media. However, radiographic methods require large and costly equipment and extensive safety measures against radiation hazards.…”

Section: Introductionmentioning

confidence: 99%

Improved interdigital sensors for structural health monitoring of composite retrofit systems

Nassr

El‐Dakhakhni

2011

Journal of Reinforced Plastics and Composites

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In this article, an improved sensor performance based on detecting the dielectric variations in composite—concrete interface and linking these variations to bond deterioration is presented. The use of composites in retrofitting concrete structures is becoming a standard technique worldwide. The bond between the composite system and the concrete element surface is essential to ensure achieving the designed performance. However, there is little research on the development of an economic structural health monitoring technique for monitoring bond quality in large structures, such as buildings and bridges. The improved sensing technique utilizes an Interdigital Capacitance Sensor design to increase the signal-to-noise ratio and to detect shallow—depth bond deteriorations. An analytical modeling technique was used to analyze the influence of the different sensor parameters, especially the dependency of the capacitance signals on the sensor geometrical dimensions. Two-dimensional finite element (FE) simulations were also used to assess different related design parameters and to verify the experimental results. A concrete slab retrofitted with composites containing pre-induced air voids to simulate bond deteriorations defects were constructed and inspected in a laboratory setting. Good agreements were found between experimental capacitance signal response parameters and those predicated from the FE simulations of the slab specimen.

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Detection of debonding in composite-aluminum joints using gamma-ray Compton scattering

Cited by 15 publications

References 6 publications

A multiresolution approach for damage detection in fiber-reinforced polymer pipe systems

A multiresolution approach for damage detection in fiber-reinforced polymer pipe systems

Modal frequencies of fiber-reinforced polymer pipes with wall-thinning using a wavelet-based finite element model

Improved interdigital sensors for structural health monitoring of composite retrofit systems

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