Use of Piezoelectric Films in Detecting and Monitoring Damage in Composites

Abstract

The increasing emphasis over the past few years on intelligent material systems and structures has resulted in a significant research effort in the areas of embedded and bonded sensors and actuators. Of the many sensing materials available, piezoelectric sensors offer a number of ad vantages. The sensor output, proportional to changes in surface displacement over a large area, can be used to interpret variations in structural and material properties, e.g., the compliance of the material. This type of sensor has also been used as an ultrasonic transducer. It offers the advantage of having a low structural impedance, thus giving an accurate measurement of the change in area, and consequently can only be used as an actuator on flexible structural systems. The aim of this article is to demonstrate the use of piezoelectric film sensors as a structural integrity monitoring device for composite materials. Tests to date have been aimed at detecting and monitoring impact damage in composite materials, as well as detecting damage in composite-to-metal mechanically fastened joints.

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References

Ahmad, I. 1988 "Smart Structures and Materials", Proceedings of ARO Smart Materials, Structures and Mathematical Issues Workshop, VPI & SU, Blacksburg, VA, Sept. 1988, pp 13-16

Atochem, N.A. 1987. Kynar Piezo Film Technical Manual, Atochem N A - Piezo Film Sensor Division, Valley Forge, PA

Bennett, J. , J. Paul , R. Jones and A. Goldman 1991 "A Preliminary Study on Damage Detection using Piezoelectric Film", ARL-STRUCT-TM 538, DSTO Aeronautical Research Laboratory, Melbourne, Australia

Brown, L.F. and R.H. Brown 1990 "Permanently Mounted Piezo Film Sensors for Structural Quantitative NDE", 1990 Review of Progress in Quantitative NDE, University of California, LaJolia, CA, July 15-20, 1990

Galea, S.C. and D.S. Saunders "Use of an In-Situ Ultrasonic C-Scanning Device to Monitor Fatigue Damage Growth in Composites", to be submitted to J. Society of Experimental Mechanics

Gerardi, T.G. 1990 "Health Monitoring Aircraft", Proceedings of U.S- Japan Workshop on Smart/Intelligent Materials and Systems, University of Hawaii, Honolulu , March 19-23, 1990

Rogers, C.A. , D.K. Barker and C.A. Jaege 1988 "Introduction to Smart Materials and Structures" , Proceedings of ARO Smart Materials, Structures and Mathematical Issues Workshop, VPI & SU, Blacksburg, VA, Sept. 1988 , pp. 17-28

Saunders, D.S. , M.G. Stimson , E. Kowal and C. Rey. 1990a "Preliminary Investigations of the Static Failure and Fatigue Behaviour of Mechanical Joints in Composite Materials" , ARL-STRUCT-TM 572, DSTO Aeronautical Research Laboratory , Melbourne, Australia, October, 1990.

Saunders, D.S. , G. Clark , T.J. van Blaricum and T.E. Preuss. 1990b "Graphite/Epoxy Coupon Testing Program" , Theoretical and Applied Fracture Mechanics , 13.105-124

10.

Saunders, D.S. , S.C. Galea and G.K. Deirmendjian . 1992. "The Development of Fatigue Damage around Fastener Holes in Thick Graphite/Epoxy Composite Laminates" , Composites, 24:1-13.

11.

Takagi, T. 1990 "A Concept of Intelligent Materials", Proceedings of U.S.-Japan Workshop on Smart/Intelligent Materials and Systems, University of Hawaii, Honolulu, March 19-23, 1990