Ultrasonic attenuation as a measure of void content in carbon-fibre reinforced plastics

Stone, D.E.W.; Clarke, Barrie

doi:10.1016/0029-1021(75)90023-7

Cited by 153 publications

(81 citation statements)

References 5 publications

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“…By varying the amount of tungsten powder it is possible to vary the acoustic impedance of the backing plate. In this prototype transducer the backing plate was designed to have an acoustic impedance of 12 MRayls, a good match for many CFRP and related materials [23]. The transducer front face was made from the glass ceramic material Macor, also with an acoustic impedance of 12…”

Section: Transducer Designmentioning

confidence: 99%

Design, development and testing of multi-functional non-linear ultrasonic instrumentation for the detection of defects and damage in CFRP materials and structures

Armitage

Wright

2013

Composites Science and Technology

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A multi-functional non-linear ultrasonic testing approach is presented for in-situ and ex-situ detection of a variety of defects (e.g. micro-cracking, delamination and disbonding) induced by various damage mechanisms (stress, impact, heat) in CFRP materials and structures. Such multi-functionality is provided via programmable and re-configurable instrumentation that incorporates a wide range of non-linear ultrasonic testing regimes, including harmonic and overtone generation, inter-modulation product generation, resonant frequency shift and pulse-inversion techniques. The capabilities of this multi-functional approach to defect detection are demonstrated by examining CFRP samples subjected to various forms of damage, specifically stress, impact and heat induced damage. We show that the multi-functional non-linear approach is well-suited to the detection of such forms of damage and that the pulse-inversion technique, largely 'ignored' in the CFRP literature, potentially provides a powerful, but as yet un-tapped, simple and effective route to the defect and damage detection. AbstractA multi-functional non-linear ultrasonic testing approach is presented for in-situ and exsitu detection of a variety of defects (e.g. micro-cracking, delamination and disbonding)induced by various damage mechanisms (stress, impact, heat) in CFRP materials and structures. Such multi-functionality is provided via programmable and re-configurable instrumentation that incorporates a wide range of non-linear ultrasonic testing regimes, including harmonic and overtone generation, inter-modulation product generation, resonant frequency shift and pulse-inversion techniques. The capabilities of this multifunctional approach to defect detection are demonstrated by examining CFRP samples subjected to various forms of damage, specifically stress, impact and heat induced damage. We show that the multi-functional non-linear approach is well-suited to the detection of such forms of damage and that the pulse-inversion technique, largely 'ignored' in the CFRP literature, potentially provides a powerful, but as yet un-tapped, simple and effective route to the defect and damage detection.

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Section: Transducer Designmentioning

confidence: 99%

Design, development and testing of multi-functional non-linear ultrasonic instrumentation for the detection of defects and damage in CFRP materials and structures

Armitage

Wright

2013

Composites Science and Technology

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“…These characteristics, evaluated by through-transmission methods, included absolute attenuation, attenuation versus frequency slope (da/df) and longitudinal wavespeed. It has been shown that these ultrasonic properties are influenced by the porosity in composite laminates [11][12][13] . Therefore, it should be possible that matrixdominated composite properties be predicted ultrasonically due to the mutual dependence of both mechanical strength and ultrasonic measurements on the composite laminate void content .…”

Section: Ultrasonic Evaluationmentioning

confidence: 99%

Mechanical Strength Degradation of Graphite Fiber Reinforced Thermoset Composites Due to Porosity

Uhl

Lucht

Jeong

et al. 1988

Review of Progress in Quantitative Nondestructive Evaluation

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“…Detection and measurement of microvoids is done by an ultrasonic through-transmission method as desribed by Stone and Clark [1]. New curves of attenuation coefficient versus void content were derived empirically for the polyimide material.…”

Section: Basic Design Criteriamentioning

confidence: 99%

Design and Operation of a Dual-Bridge Ultrasonic Inspection System for Composite Materials

Copley

1987

Review of Progress in Quantitative Nondestructive Evaluation

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Ultrasonic attenuation as a measure of void content in carbon-fibre reinforced plastics

Cited by 153 publications

References 5 publications

Design, development and testing of multi-functional non-linear ultrasonic instrumentation for the detection of defects and damage in CFRP materials and structures

Design, development and testing of multi-functional non-linear ultrasonic instrumentation for the detection of defects and damage in CFRP materials and structures

Mechanical Strength Degradation of Graphite Fiber Reinforced Thermoset Composites Due to Porosity

Design and Operation of a Dual-Bridge Ultrasonic Inspection System for Composite Materials

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