Embedded PVF2 sensors for smart composites

Piezoelectric polyvinylidenefluoride films have been embedded between layers of composite laminates and cured at temperatures up to 200 degree(s)C. The films retain much of their piezoelectric response upon cooling even though the cure temperature exceeds the melting point of the film. The response of these embedded sensors to impact loading is discussed. We have also used embedded sensors to monitor curing of reinforced low temperature curing epoxy films sandwiched between polycarbonate sheets and subjected to an intermittent external load perpendicular to the surface. The sensor response drops as cure continues since the stiffer resin transfers less load to the film.

[1]  Steven Boyd,et al.  Effect of embedded fiber optics on the mechanical properties of a composite host material , 1993, Smart Structures.

[2]  M. Litt,et al.  Pyroelectricity and piezoelectricity in nylon 11 , 1977 .

[3]  Norio Shinya,et al.  Local Strain Sensing Using Piezoelectric Polymer , 1993 .

[4]  Seizo Miyata,et al.  Piezoelectricity Revealed in the Copolymer of Vinylidene Cyanide and Vinyl Acetate , 1980 .

[5]  J. Scheinbeim,et al.  Effect of annealing on the ferroelectric behavior of nylon - 11 and nylon - 7 , 1991 .

[6]  Wing Kong Chiu,et al.  An investigation of thin PVDF films as fluctuating-strain-measuring and damage-monitoring devices , 1993 .

[7]  Raymond M. Measures,et al.  Smart composite structures with embedded sensors , 1992 .

[8]  Dennis H. Bowen,et al.  Composite Materials Monitoring Through Embedded Fibre Optics , 1989, Other Conferences.

[9]  Raymond M. Measures,et al.  Advances toward fiber optic based smart structures [also Erratum 31(4) 861-862 (Apr1992)] , 1992 .

[10]  T. B. Salzano,et al.  Embedded-strain-sensor development for composite smart structures , 1992 .

[11]  Wing Kong Chiu,et al.  The Use of Piezoelectric Thin Film Sensors for Structural Integrity Monitoring , 1994 .

[12]  D. A. Dillard,et al.  Nondestructive evaluation of model adhesive joints by PVDF piezoelectric film sensors , 1993 .

[13]  K. Craig,et al.  Damage detection in composite structures using piezoelectric materials (and neural net) , 1994 .

[14]  M. G. Abdallah,et al.  A Multi-Purpose Sensor for Composite Laminates Based on a Piezo-Electric Film , 1992 .

[15]  Wing Kong Chiu,et al.  Use of Piezoelectric Films in Detecting and Monitoring Damage in Composites , 1993 .

[16]  Raymond M. Measures,et al.  Fiber optic sensing for composite smart structures , 1993 .

[17]  Y. Jayet,et al.  Monitoring thermoset polymerization by using piezoelectric measurements , 1992 .