In situ detection of damage in CFRP laminates by electrical resistance measurements

Abry, Jean‐Christophe; Bochard, S.; Chateauminois, A.; Salvia, Michelle; Giraud, G.

doi:10.1016/s0266-3538(98)00132-8

Cited by 299 publications

(132 citation statements)

References 7 publications

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“…Electrical conductance in the transverse direction is much lower than that in the fiber direction. Abry and others (14) as well as the authors (15) have experimentally revealed that the electrical conductance ratio in the transverse direction (σ 90 ) to the fibre direction (σ 0 ) is approximately σ 90 /σ 0 = 10 −3 , and that the electrical conductivity ratio in the thickness direction (σ t ) to the fibre direction is approximately σ t /σ 0 = 10 −4 for carbon/epoxy laminates.…”

Section: Principle Of Electrical Resistance Change In Cfrp With Loadingmentioning

confidence: 97%

Electrical Resistance Change of Unidirectional CFRP Due to Applied Load

Todoroki

Yoshida

2004

JSME Int. J., Ser. A

122

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Carbon Fiber Reinforced Plastic (CFRP) is composed of electric conductive carbon fibers and electric insulator resin. Self-monitoring system has been reported utilizing electric resistance change of unidirectional CFRP due to fiber breakages and to applied strain. Piezoresistivity is electric resistance change with applied strain. Many researchers have already reported the piezoresistivity of unidirectional CFRP. There is, however, large discrepancy in the measured piezoresistivity even in the fiber direction during tensile loading: both positive piezoresistivity (electric resistance increase) and negative piezoresistivity (electric resistance decrease) are reported during tensile tests. Electric resistance change at electrodes due to poor electric contacts are reported to be a main cause of this large discrepancy. In the present study, therefore, basic properties of piezoresistivity were measured with specimens made from single-ply and multi-ply laminates using a four-prove method. Many cases of electric resistance changes in the fiber direction transverse direction were measured during tensile loading. Effect of shear loading was also investigated using a shear test. To investigate the effect of poor electric contact at the electrodes, electrodes were made without polishing specimen surface and a tensile test was performed with measuring piezoresistivity. After the test, the specimen surface was polished, and a tensile test was performed again using the identical specimen. As a result, positive piezoresistivity was obtained for both single-ply and multi-ply specimens and negative piezoresistivity is confirmed that it was caused by the poor electric contact at electrodes.

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Section: Principle Of Electrical Resistance Change In Cfrp With Loadingmentioning

confidence: 97%

Electrical Resistance Change of Unidirectional CFRP Due to Applied Load

Todoroki

Yoshida

2004

JSME Int. J., Ser. A

122

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“…Generally speaking, the emphasis is put on the macroscopic consequences of these phenomena through the analysis of the damage-induced behavior. In addition to conventional straingauge data, some studies rely for instance on acoustic emissions monitoring [2,3], ultrasonic inspection [4,5], electrical resistance measurements [6,7], and even fiber sensors data [8,9].…”

Section: Introductionmentioning

confidence: 99%

Damage investigation in CFRP composites using full-field measurement techniques: Combination of digital image stereo-correlation, infrared thermography and X-ray tomography

Goidescu¹,

Welemane²,

Girard³

et al. 2013

Composites Part B: Engineering

141

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“…This conclusion may also be found in various articles about this subject [1,2,3,4,5,6,7,8,9,10,11]. While doing the literature study, it was noticed that most authors concentrated their work on polymers with unidirectional fibre reinforcement [4,5,6,7,8,9,10,11,12,13]. Occasionally, cross-ply laminates are studied [3,4,5,11,12], but materials reinforced with fabrics were never closely observed using this technique.…”

mentioning

confidence: 79%

Electrical resistance measurement for in situ monitoring of fatigue of carbon fabric composites

Baere

Paepegem

Degrieck

2010

International Journal of Fatigue

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This study investigates whether fatigue damage can be monitored using the electrical resistance of the carbon fabric reinforced thermoplastic. A four-probe method, using rivets for the current injection and conductive tape for the voltage measurement is presented. Quasi-static and hysteresis tests are presented to assess the method, with promising results. Then, fatigue tests at both 2 and 5 Hz are discussed. For the material under study, neither stiffness reduction nor permanent elongation occurred and therefore, fibre fracture is not the dominant mode of damage. As a result, the electrical resistance measurement was not capable of monitoring damage growth inside the specimen, since it is sensitive to fibre failure.

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In situ detection of damage in CFRP laminates by electrical resistance measurements

Cited by 299 publications

References 7 publications

Electrical Resistance Change of Unidirectional CFRP Due to Applied Load

Electrical Resistance Change of Unidirectional CFRP Due to Applied Load

Damage investigation in CFRP composites using full-field measurement techniques: Combination of digital image stereo-correlation, infrared thermography and X-ray tomography

Electrical resistance measurement for in situ monitoring of fatigue of carbon fabric composites

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