Multi-prove electric potential change method for delamination monitoring of graphite/epoxy composite plates using normalized response surfaces

Delamination is a significant defect of laminated composites. The present study employs an electric potential change method in an attempt to identify internal delaminations experimentally. The method adopts reinforcing graphite fibres as sensors. In our previous paper, a two-prove method was adopted for the electric-resistance change measurements because of the simplicity. The two prove method is not appropriate for a precise measurement, and it tends to include a large experimental error in the electric resistance change owing to the electric resistance change at the electrodes. Instead, the present paper employs a multiple-prove method for the measurements. In the present study, high precise measurement system of electric voltage change is developed, and the electric voltage measurement method is adopted for identification of embedded delamination location and size. Measured electric potential data are normalized for creations of response surface to identify the delamination. As a result, the new multi-prove electric potential method is shown to be effective for the identifications of embedded delamination cracks of graphite/epoxy composite laminates.

[1]  Xiaojun Wang,et al.  Sensing delamination in a carbon fiber polymer-matrix composite during fatigue by electrical resistance measurement , 1997 .

[2]  Shiv P. Joshi,et al.  Damage detection in CFRP by electrical conductivity mapping , 2001 .

[3]  Akira Todoroki,et al.  The effect of number of electrodes and diagnostic tool for monitoring the delamination of CFRP laminates by changes in electrical resistance , 2001 .

[4]  Peter Schwartz,et al.  Monitoring bending fatigue in carbon-fibre/epoxy composite strands: a comparison between mechanical and resistance techniques , 2001 .

[5]  D.D.L. Chung,et al.  Carbon‐Fiber‐Reinforced Concrete as an Intrinsically Smart Concrete for Damage Assessment during Dynamic Loading , 1995 .

[6]  A. Chateauminois,et al.  In situ detection of damage in CFRP laminates by electrical resistance measurements , 1999 .

[7]  Douglas C. Montgomery,et al.  Response Surface Methodology: Process and Product Optimization Using Designed Experiments , 1995 .

[8]  Karl Schulte,et al.  Load and failure analyses of CFRP laminates by means of electrical resistivity measurements , 1989 .

[9]  Akira Todoroki,et al.  Statistical Evaluation of Modified Electrical Resistance Change Method for Delamination Monitoring of CFRP Plate , 2005 .

[10]  Akira Todoroki,et al.  Composite Materials. Electric Resistance Change Method for Identification of Embedded Delamination of CFRP Plates. , 2001 .

[11]  F. J. Arendts,et al.  Electrical crack length measurement and the temperature dependence of the mode I fracture toughness of carbon fibre reinforced plastics , 1993 .

[12]  Phil E. Irving,et al.  Fatigue damage characterization in carbon fibre composite materials using an electrical potential technique , 1998 .

[13]  A. Todoroki,et al.  Health monitoring of internal delamination cracks for graphite/epoxy composites by electric potential method , 2000 .

[14]  S. Al-Hassani,et al.  ELECTRICAL RESISTANCE MEASUREMENT TECHNIQUE FOR DETECTING FAILURE IN CFRP MATERIALS AT HIGH STRAIN RATES , 1994 .

[15]  G. Giraud,et al.  In-situ monitoring of damage in CFRP laminates by means of AC and DC measurements , 2001 .

[16]  Kazumasa Moriya,et al.  A study on flaw detection method for CFRP composite laminates. (1st report). The measurement of crack extension in CFRP composites by electrical potential method. , 1988 .

[17]  Dae-Cheol Seo,et al.  Damage detection of CFRP laminates using electrical resistance measurement and neural network , 1999 .

[18]  Akira Todoroki,et al.  Measurement of orthotropic electric conductance of CFRP laminates and analysis of the effect on delamination monitoring with an electric resistance change method , 2002 .

[19]  M. Miyayama,et al.  Foreseeing of Fracture in CFGFRP Composites by Measuring Electrical Resistance. , 1992 .

[20]  D.D.L. Chung,et al.  Piezoresistivity in continuous carbon fiber polymer‐matrix composite , 2000 .

[21]  D. Chung,et al.  Carbon fiber reinforced concrete for smart structures capable of non-destructive flaw detection , 1993 .

[22]  Akira Todoroki,et al.  High performance estimations of delamination of graphite/epoxy laminates with electric resistance change method , 2003 .

[23]  Hiroaki Yanagida,et al.  Hybrid composites with self-diagnosing function for preventing fatal fracture , 2001 .

[24]  A. Todoroki,et al.  Evaluation of Orthotropic Electrical Resistance for Delamination Detection of CFRP by Electrical Potential Method. , 1998 .

[25]  Hideo Kobayashi,et al.  Application of Electric Potential Method to Smart Composite Structures for Detecting Delamination , 1995 .

[26]  Akira Todoroki,et al.  Delamination monitoring of graphite/epoxy laminated composite plate of electric resistance change method , 2002 .

[27]  Karl Schulte,et al.  Non-destructive testing of FRP by d.c. and a.c. electrical methods , 2001 .