Detection of internal cracks and delamination in carbon-fiber-reinforced plastics using SQUID-NDI system

Hatsukade, Yoshimi; Kasai, Nahoko; Kurosawa, Miki B.; Kawai, R; Takashima, Hiroshi; Kojima, Fumio; Ishiyama, Atsushi

doi:10.1016/s0921-4534(02)00687-1

Cited by 12 publications

(10 citation statements)

References 8 publications

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“…ET is noncontact and NDT as long as thermal effects from resistive heating and energy dissipation are sufficiently small. Superconducting quantum interference devices (SQUID) have been used for ET to detect damage in CFRP (190). However, SQUID may be replaced by sensors based on giant magnetoresistance or giant magnetoimpedance effects (191).…”

Section: Electromagnetic Test Methodsmentioning

confidence: 99%

Nondestructive Testing of Polymers and Polymer–Matrix Composites

Brunner

Hack

Neuenschwander

2015

Encyclopedia of Polymer Science and Technology

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Because of their unique properties, polymers and polymer–matrix composites pose both challenges and opportunities for nondestructive testing. The increasing use of these materials creates a demand for nondestructive verification of various properties or specifications, determination of structural integrity, or prediction of service‐life. On the other hand, development of new nondestructive test methods, improved sensitivity, or faster data acquisition and analysis may allow for nondestructive testing applications that hitherto did not seem feasible or economical. This article provides a brief overview of established methods and emerging applications in nondestructive testing of polymers and polymer–matrix composites.

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Section: Electromagnetic Test Methodsmentioning

confidence: 99%

Nondestructive Testing of Polymers and Polymer–Matrix Composites

Brunner

Hack

Neuenschwander

2015

Encyclopedia of Polymer Science and Technology

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“…Using the above equations to detect the disturbance, the defects could be identified. An in-house low critical temperature (T c ) SQUID-NDE system, constructed in the National Institute of Advanced Industrial Science and Technology (AIST) [18,19], was used to detect damage in notched C/C composites (CT specimens, W = 100 mm for 2D C/Cs, W = 50 mm for 3D C/Cs). This system was composed of a low-T c SQUID sensor, a planar gradiometer (pick-up coils), SQUID electronics, a helium dewar, an x-y scanning stage, and a lock-in amplifier, as shown in Fig.…”

Section: Superconducting Quantum Interference Devicementioning

confidence: 99%

“…This system was composed of a low-T c SQUID sensor, a planar gradiometer (pick-up coils), SQUID electronics, a helium dewar, an x-y scanning stage, and a lock-in amplifier, as shown in Fig. 3 [18,19]. A low-frequency (710 and 220 Hz for 2D C/Cs and 3D C/Cs, respectively) sinusoidal current of 90 mA was injected in the x-or y-direction into each CT specimen.…”

Section: Superconducting Quantum Interference Devicementioning

confidence: 99%

“…5, the 3D C/C showed no micro-cracks, but did reveal the extension of splitting mainly due to shear stress which appeared near the crack tip. This extension of splitting was caused by extremely low interfacial strength between the fiber and matrix, and due to low shear strength of the 3D C/C [18]. Thus, the final damage observed in the DEN tests of the 3D C/Cs was pull-out of the loading bundles without any fiber failure.…”

Section: Squidmentioning

confidence: 99%

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Damage detection of C/C composites using ESPI and SQUID techniques

Hatta¹,

Aly-Hassan²,

Hatsukade³

et al. 2005

Composites Science and Technology

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“…A small first-order low-T c gradiometer (with no flux transformer) was succesfully used to detect flaws in 20 mm thick [0°/90°] cross-ply CFRP laminates up to a depth of 15 mm (Fig. 15) [24]. To calculate the dependance between the gradiometer response dB z /dx and the frequency, the authors used the skin effect relationship for the current density in a metal (~e (-z/δ) where δ is the penetration depth, see Sec.…”

Section: Fig 13mentioning

confidence: 99%

Nondestructive detection of damage in carbon fibre composites by SQUID magnetometry

Ruosi

2005

phys. stat. sol. (c)

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Monitoring of structural integrity is an essential issue in enhancing the affordability as well the safety of modern aircraft and spacecraft structures. Increasingly, metallic parts of aircrafts are being replaced by carbon fibre composite components due to their high strength and stiffness combined with low density. This paper reviews of the use of superconducting quantum interference devices (SQUIDs) in the detection of different types of damage in carbon fibre panels. The results presented here on impact damage on carbon fibre reinforced polymer and cracks induced by tensile loads on carbon fibre reinforced carbon matrix show that this method is sensitive not only to the presence but also the severity of damage. Indeed, it enables one to distinguish between the different failure mechanisms as the damage process evolves. SQUIDs response to artificial delaminations, flaws and deep-lying defects are also presented. The application of a neural network system for the detection of impact damage in a noisy environment is discussed. Experimental results demonstrate that nondestructive evaluation using SQUID magnetometers is a suitable technique to investigate composites to improve their mechanical properties

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Detection of internal cracks and delamination in carbon-fiber-reinforced plastics using SQUID-NDI system

Cited by 12 publications

References 8 publications

Nondestructive Testing of Polymers and Polymer–Matrix Composites

Nondestructive Testing of Polymers and Polymer–Matrix Composites

Damage detection of C/C composites using ESPI and SQUID techniques

Nondestructive detection of damage in carbon fibre composites by SQUID magnetometry

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