Damage detection of CFRP laminates using electrical resistance measurement and neural network

This study deals with the durability tests of a new copper plated electrode process for self-sensing or self-healing Carbon Fiber Reinforced Plastic (CFRP) composites. The self-sensing or self-healing CFRP composites adopt carbon fibers as sensors or actuators. The electrical contacts at the electrodes have a significant effect on the self-sensing or self-healing ability. This research proposes a new electric copper plated process for fabricating reliable electrodes. Using single-ply specimens, electrical contact resistances after cyclic loading are measured. The cyclic loading test is performed to investigate the long term durability of these new electrodes. The new copper plated electrode was found to have high durability after cyclic loading and is appropriate for the practical self-sensing or self-healing CFRP composites.

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“…(4) Clean the specimen surface. (5) Polish the surface with fine (#400) sandpaper. (6) Use silver paste to make electrical contact.…”

Section: New Copper Plating Electrodementioning

confidence: 99%

Durability Estimates of Copper Plated Electrodes for Self-sensing CFRP Composites

Todoroki

Suzuki

Mizutani

et al. 2010

JMMP

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“…A sine wave was used for the loading pattern. The maximum number of cycles used for this experiment was 10 7 . The cyclic loading strain of the cross-ply laminate was also set to the same value as the quasi-isotropic specimen.…”

Section: Specimens and Fatigue Test Methodsmentioning

confidence: 99%

“…The inner couple of electrodes are used to measure electrical voltage change. Irving et al [6] and Seo et al [7] used the electrical resistance change method to detect fatigue damage in a unidirectional CFRP, and in a crossply CFRP. De Baere et al [15] used the electrical resistance method for fatigue damage detection in woven fabric CFRP composites.…”

Section: Introductionmentioning

confidence: 99%

Fatigue damage detection of CFRP using the electrical resistance change method

Todoroki¹,

Mizutani²,

Suzuki³

et al. 2013

International Journal of Aeronautical and Space Sciences

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Electrical resistance change measurements were performed, to detect fatigue damage of a quasi-isotropic CFRP and cross-ply CFRP laminates. A four-probe method was used to measure the exact electrical resistance change. A three-probe method was used to measure the electrical contact resistance change, during long cyclic loading. The specimen side surface was observed using a video-microscope to detect damage. The measured electrical resistance changes were compared with the observed damage. The results of this study show that the electrical resistance increase of the quasi-isotropic laminate was caused by a delamination crack between ±45° plies. Matrix cracking caused a small electrical resistance increase of the cross-ply laminate, but the decreased electrical resistance caused by the shear-plastic deformation impedes matrix-cracking detection.

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“…Several composite systems have been examined in the past, using the self-sensing principle of electrical resistance. Carbon fiber-reinforced polymer [9][10][11][12][13][14][15][16][17][18][19] , SiC fiber-reinforced polymer [20][21] , and carbon fiber-reinforced carbon 15 are a few examples of composites that show a change in electrical resistance upon mechanical loading and damage. For the case of fiber-reinforced polymer, conductive fibers are inside an insulating matrix.…”

Section: Introductionmentioning

confidence: 99%

Detecting cracks in ceramic matrix composites by electrical resistance

Smith

Gyekenyesi

2011

SPIE Proceedings

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The majority of damage in SiC/SiC ceramic matrix composites subjected to monotonic tensile loads is in the form of distributed matrix cracks. These cracks initiate near stress concentrations, such as 90 o fiber tows or large matrix pores and continue to accumulate with additional stress until matrix crack saturation is achieved. Such damage is difficult to detect with conventional nondestructive evaluation techniques (immersion ultrasonics, x-ray, etc.). Monitoring a specimen"s electrical resistance change provides an indirect approach for monitoring matrix crack density. SylramiciBN fiber-reinforced SiC composites with a melt infiltrated (MI) matrix were tensile tested at room temperature.Results showed an increase in resistance of more than 500% prior to fracture, which can be detected either in situ or post-damage. A relationship between resistance change and matrix crack density was also determined.

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Damage detection of CFRP laminates using electrical resistance measurement and neural network

Cited by 152 publications

References 8 publications

Durability Estimates of Copper Plated Electrodes for Self-sensing CFRP Composites

Durability Estimates of Copper Plated Electrodes for Self-sensing CFRP Composites

Fatigue damage detection of CFRP using the electrical resistance change method

Detecting cracks in ceramic matrix composites by electrical resistance

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