An experimental investigation of through-thickness electrical resistivity of CFRP laminates

Louis, Mithaq A.; Joshi, Shailendra P.; Brockmann, Walter

doi:10.1016/s0266-3538(00)00177-9

Cited by 66 publications

(30 citation statements)

References 2 publications

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“…This means we can treat CFRP as an orthotropically conductive material for alternating current with frequencies under 1 MHz. Louis et al (38) have found there is large scatter in the resistance in the orthogonal direction of laminated CFRP.…”

Section: Electrical Propertiesmentioning

confidence: 99%

Strain and Damage Monitoring of CFRP Laminates by Means of Electrical Resistance Measurement

Todoroki

Ueda

Hirano

2007

JMMP

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This review discusses the use of electrical resistance and potential change in various methods for monitoring Carbon Fiber Reinforced Plastic (CFRP) composites. CFRP composites have electrical conductivity as they contain carbon fibers. When fibers and fiber networks break within the structure its electrical resistance changes; the electrical resistance of carbon fiber changes with the applied strain just as physical resistance varies in a conventional strain gage. Using these changes in electrical resistance damage to CFRP composites can be monitored and applied strain measured without implementation of additional sensors. This makes CFRP a self-sensing material. The electrical resistance change method has been applied for decades to detect carbon fiber breakages. As regards the measurement of applied strain, there is divergence of opinion amongst researchers about the piezoresistance of CFRP. This discrepancy is discussed in detail in this review. For monitoring damage such as delamination cracks, the electrical resistance change method can accurately estimate the location and dimension of the damage. This review also discusses electrical potential change and eddy current methods for monitoring CFRP composites.

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Section: Electrical Propertiesmentioning

confidence: 99%

Strain and Damage Monitoring of CFRP Laminates by Means of Electrical Resistance Measurement

Todoroki

Ueda

Hirano

2007

JMMP

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“…But in electrical methods, most of the time, the composite system itself is used as the sensor. Detecting damage using electrical resistivity is a well-known practice for damage detection in composite research [9][10][11][12][13][14][15][16][17][18][19][20]. Irving and Thiagarajan [20] have studied electrical resistance changes for both static and fatigue testing of CFRP.…”

Section: Introductionmentioning

confidence: 99%

Relationship of dielectric property change to composite material state degradation

Raihan

Adkins

Baker

et al. 2014

Composites Science and Technology

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a b s t r a c tPolymer matrix composites are widely used in many industries, i.e. aerospace, microelectronics, energy storage etc., because of their unique properties and performance. During their service life, changes of material state caused by deformation and damage accumulation under combined mechanical, thermal and electrical fields requires fundamental understanding to support design of those material systems. Heterogeneous material systems are inherently dielectric as determined by their complex morphology. Dielectric properties of such materials are altered by many factors, e.g., electrical and structural interactions of the particles, and the shape, orientation and distribution of the constituents of the material system. When damage occurs, new phases are created as micro-defects, and grow progressively, interact, and accumulate. The dielectric properties of the composite system also change in a manner that uniquely reflects those details. In the present work we report a non-invasive, in-operando technique to study changes in dielectric properties during progressive damage accumulation in composite materials subjected to mechanical loading.

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“…The electrical resistance gained interest in the past decade. [3][4][5][6][7][8][9][10][11][12] This technique measures the global change of the resistivity for the composite lay-up. The reconstruction of the damage map then requires two different steps: (1) the reconstruction of the in-the-volume conductivity map, that is only solving the inverse electrical problem with defined boundary conditions (2) reconstructing from these local variations of resistivity the underlying damage mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Towards mechanisms-guided resistivity-based monitoring of damage in laminated composites

Lubineau

2013

54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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A convenient health monitoring technique for detecting degradation in laminated composite is to monitor the change of electrical resistance along multiple conduction paths within the structure. Yet, the relations between the global modification of resistivity and the exact underlying damage map is still unclear that makes difficult to interpret these nondestructive-testing results. The challenge is then to be able to reconstruct from these global observation the underlying damage map. This is even more difficult due to the numerous underlying damage mechanisms that can take place either at the inter laminar of intra laminar level. This paper intends to provide some preliminary insights about strategies to recover the damage state based only on global measurements. We focus here on transverse cracking detection. We introduce the homogenization process that defines at the meso scale an equivalent homogeneous ply that is energetically equivalent to the cracked one. This can be used as a first tool to reconstruct damage maps based on global resistivity measurements.

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An experimental investigation of through-thickness electrical resistivity of CFRP laminates

Cited by 66 publications

References 2 publications

Strain and Damage Monitoring of CFRP Laminates by Means of Electrical Resistance Measurement

Strain and Damage Monitoring of CFRP Laminates by Means of Electrical Resistance Measurement

Relationship of dielectric property change to composite material state degradation

Towards mechanisms-guided resistivity-based monitoring of damage in laminated composites

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