Micro-crack detection and assessment with embedded carbon nanotube thread in composite materials

Abstract

Carbon nanotube thread has shown strong promise to be built into or onto composite materials for strain and damage monitoring via the material’s piezoresistive property. It has been found that a distinguishing feature of sensing thread incorporated in these materials is the detection of micro-cracking. This study articulates how embedded carbon nanotube thread in unidirectional glass fiber composites can identify the onset of matrix cracking, track crack growth, and differentiate between crack breathing and closing states. This information is obtained by analyzing the resistance response of the thread with a low-speed data acquisition system and a simple Wheatstone bridge circuit. A digital optical microscope was utilized to verify that a micro-crack was indeed present in the structure at the location of the sensor thread. Additionally, to demonstrate the effectiveness of this crack detection approach compared to past crack detection approaches, a comparison against foil-type strain gauges and piezoelectric accelerometers was made. Finally, a simple crack model is presented for the sensor thread.

Keywords

Carbon nanotube thread micro-crack detection composite materials piezoresistive sensor embedded sensor

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References

Federal Aircraft Administration (1997). Advisory Circular 43-204, Visual inspection for aircraft.

Federal Aircraft Administration (2009). Advisory Circular 20-107B, Composite aircraft structure.

Navadunsky

Lucas

Salkind

. Early fatigue damage detection in composite materials. J Compos Mater 1975; 9: 394–408.

Daniel

Mullineaux

Ashimaz

. The embedded strain gauge technique for testing boron/epoxy composites. In: Composite materials: testing and design (Second conference) American Society for Testing and Materials, Philadelphia, PA 1972.

Crane

Macander

Gagoric

. Fiber optics for a damage assessment system for fiber reinforced plastic composite structures. Rev Prog Q 1983; 2A: 1419–1430.

Kuang

KSC

Cantwell

. Use of conventional optical fibers and fiber Bragg gratings for damage detection in advanced composite structures: A review. Appl Mech Rev 2003; 56(5): 493–513.

Schaaf

. Composite materials with integrated embedded sensing networks. MS Thesis, University of California, San Diego, San Diego, CA, 2008.

Yost

Cantrell

. Surface generation and detection of coupled fiber-matrix mode acoustic wave propagation in fiber-reinforced composites. In: Proceedings of the twelfth annual review of progress in quantitative nondestructive evaluation, Williamsburg, VA, 23–28 June 1986.

Achenbach

Komsky

Zhang

. Ultrasonic surface wave technique to determine fatigue damage. In: Winter annual meeting of the American society of mechanical engineers, Dallas, TX, USA, 25–30 November 1990.

10.

Larrosa

Lonkar

Shankar

. Damage classification in composite laminates: Matrix micro-cracking and delamination. In: Proceedings of the 8th international workshop on structural health monitoring, condition-based maintenance and intelligent structures, Stanford, CA, 13–15 September 2011.

11.

Wang

Chung

DDL

. Continuous carbon fibre epoxy-matrix composite as a sensor of its own strain. Smart Mater Struct 1996; 5(6): 796.

12.

Abry

Choi

Chateauminois

. In-situ monitoring of damage in CFRP laminates by means of AC and DC measurements. Compos Sci Technol 2001; 61(6): 855–864.

13.

Thostenson

Chou

T-W

. Carbon nanotube networks: sensing of distributed strain and damage for life prediction and self healing. Adv Mater 2006; 18(21): 2837–2841.

14.

Fernberg

Nilsson

Joffe

. Piezoresistive performance of long-fiber composites with carbon nanotube doped matrix. J Intel Mat Syst Str 2009; 20(9): 1017–1023.

15.

NASA. Multifunctional carbon nanotube yarn sensors. Advanced Sensing and Optical Measurement Branch, April 2008, http://asomb.larc.nasa.gov/research/nano_technology/yarn_sensors.htm (accessed 1 February 2012).

16.

Abot

Song

Sri Vatsavaya

. Delamination detection with carbon nanotube thread in self-sensing composite materials. Compos Sci Technol 2010; 70(7): 1113–1119.

17.

Zhao

Yuan

F-G

. Carbon nanotube yarn sensors for structural health monitoring of composites. In: Proceedings of SPIE nondestructive characterization for composite materials, aerospace engineering, civil infrastructure, and homeland security, San Diego, CA, 6 March 2011.

18.

Horoschenkoff

Mueller

Kroell

. On the characterization of the piezoresistivity of embedded carbon fibres. In: ICCM international conferences on composite materials, Edinburgh, 27–31 July 2009.

19.

Shanov

Schulz

. Carbon nanotubes: synthesis, characterization, and applications (PDF Power Point for Nanodevice Class). Cincinnati, OH: University of Cincinnati, 2007.

20.

Jayasinghe

Chakrabarti

Schulz

. Spinning yarn from long carbon nanotube arrays. J Mater Res 2011; 26(5): 645–651.

21.

Brigitte

Alain

Claude

. Dispersions and fibers of carbon nanotubes. 27–30 November 2000. MRS Proceedings, 633, A12.1 doi:10.1557/PROC-633-A12.1.

22.

Behabtu

Young

Tsentalovich

. Strong, light, multifunctional fibers of carbon nanotubes with ultrahigh conductivity. Science 2013; 339: 182–186.

23.

Zhang

Jiang

Feng

. Spinning and processing continuous yarns from 4-inch wafer scale super-aligned carbon nanotube arrays. Advanced Materials 2006; 18: 1505–1510.

24.

Hehr

Schulz

Shanov

. Embedded carbon nanotube thread piezoresistive strain sensor performance. Sensor Rev 2014; 34: 209–219.

25.

Obitayo

Liu

. A review: carbon nanotube-based piezoresistive strain sensors. J Sensor 2012; 2012: 652438 (15 pp.).