Electrical resistance measurement technique for detecting failure in CFRP materials at high strain rates

Kaddour, A.S.; Al-Salehi, F. A. R.; Al-Hassani, S.T.S.; Hinton, M.J.

doi:10.1016/0266-3538(94)90107-4

Cited by 114 publications

(44 citation statements)

References 17 publications

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“…AC and DC electrical methods have been extensively studied since then and have been used to study a variety of damage mechanisms, e.g. delamination or matrix cracking, under static and dynamic loading conditions [2][3][4][5][6][7][8][9][10][11]. The "piezoresistive" effect of carbon fibres also allows a sensing of the applied stress/strain [8,[12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Load and health monitoring in glass fibre reinforced composites with an electrically conductive nanocomposite epoxy matrix

Böger

Wichmann

Meyer

et al. 2008

Composites Science and Technology

304

180

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. Load and health monitoring in glass fibre reinforced composites with an electrically conductive nanocomposite epoxy matrix. Composites Science and Technology, Elsevier, 2009, 68 (7-8) In this work a new approach for condition monitoring was investigated, which, unlike other attempts, does not require additional sensors, but instead is performed directly by the measurement of a material property of the FRP. An epoxy resin was modified with two different types of carbon nanotubes and with carbon black, in order to achieve an electrical conductivity. Glass fibre reinforced composites (GFRP) were produced with these modified epoxies by resin transfer moulding (RTM). Specimens were cut from the produced materials and tested by incremental tensile tests and fatigue tests and the interlaminar shear strength (ILSS) was measured. During the mechanical tests the electrical conductivity of all specimens was monitored simultaneously, to assess the potential for stress/strain and damage monitoring. ACCEPTED MANUSCRIPT 2The results presented in this work, show a high potential for both, damage and load detection of FRP structures via electrical conductivity methods, involving a nanocomposite matrix.

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Section: Introductionmentioning

confidence: 99%

Load and health monitoring in glass fibre reinforced composites with an electrically conductive nanocomposite epoxy matrix

Böger

Wichmann

Meyer

et al. 2008

Composites Science and Technology

304

180

View full text Add to dashboard Cite

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“…Subsequently, it was shown that when a load was applied, the conductivity changed in a reversible manner, such that the material acts as a strain gage [2][3][4]. This method proved to be an effective way of using the sample itself as a strain gage and allowed the real-time monitoring of strain, but this method relies on bulk conductivity changes in the material and thus provides no distinction between localized high-stress concentrations or a more general stress throughout the material.…”

Section: The Principles Of Self-sensingmentioning

confidence: 97%

“…It has been shown over a number of studies that a relationship between strain and electrical resistance [1,2] can be established, such that a gage factor can be derived, allowing resistance measurements to be directly related to strain in a manner analogous to conventional resistance strain gages. With resistance-based strain gages, the resistance of a thin track of metal changes as it is strained, with the resistance increasing as the strain increases; consequently, the metal track becomes physically thinner as it is strained.…”

Section: Carbon-fiber Strain Gagesmentioning

confidence: 99%

Self-sensing and self-healing in composites

Hayes

Swait

Lafferty

2015

Recent Advances in Smart Self-Healing Polymers and Composites

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“…Electrical behavior of a single composite ply: The electrical behavior of composite plies is usually highly anisotropic [12,13,14]. the conductivity tensor Σ…”

Section: Mesoscale Homogenization and Detectability Of Transverse Cracksmentioning

confidence: 99%

Validation of Micro-Meso Electrical Relations for Laminates with Varying Anisotropy

Selvakumaran

Lubineau

2015

AMM

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Abstract. For electrical impedance tomography (EIT) to be useful in monitoring transverse cracks in composites, it is imperative to establish the relation between conductivity and cracking density. Micro to meso scale homogenization has been developed for classical carbon fiber reinforced polymer (CFRP) laminate which provides such a relationship. However, we have shown in previous studies that the detectability of transverse cracks in such CFRP, which are characterized by very anisotropic electrical properties, is poor. Then, it is better to lower the electrical anisotropy, which can be achieved by various technologies including doping the polymeric resin by conductive nanoparticles. However, the validity of mesoscale homogenization for laminates with such low anisotropy has not been tested before. Here, we show that the mesoscale damage indicator is intrinsic for composites with varying anisotropy.

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Electrical resistance measurement technique for detecting failure in CFRP materials at high strain rates

Cited by 114 publications

References 17 publications

Load and health monitoring in glass fibre reinforced composites with an electrically conductive nanocomposite epoxy matrix

Load and health monitoring in glass fibre reinforced composites with an electrically conductive nanocomposite epoxy matrix

Self-sensing and self-healing in composites

Validation of Micro-Meso Electrical Relations for Laminates with Varying Anisotropy

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