System for in-situ delamination detection in composites

Details System for in-situ delamination detection in composites System for in-situ delamination detection in composites

1996-09-09

1998-09-29

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73602, 73768, 356 32, 356 35, 356 355, G01N 2900

Patent

active

058147292

ABSTRACT:
In a system for in-situ delamination detection in composites, the invention employs a system which evaluates the mechanical vibration response of composite material structures. The damping characteristics of the composite structure are extracted from the detected wave properties generated by imbedded piezoelectric ceramic actuators and received by imbedded high strain sensitive fiber optic sensors. Such a sensor system is simple to operate for real-time non-destructive strain and displacement monitoring and delamination detection, without the need to remove the tested surface from operation.
During the routine structural integrity monitoring operation, mechanical vibration pulses are launched into the composite from one actuator. The strain signal's propagation patterns are measured in real time by the fiber-optic sensors at different grating locations. Different travel times are computed dependent on the location of the receiving gratings.
Propagation of the waves through a delaminated area results in wave modal properties (damping characteristics) which show a difference from those propagating through the delamination-free area. Successive signals from different locations permit computation of the location of the delamination defect.

REFERENCES:
patent: 2677960 (1954-05-01), Moses
patent: 3038329 (1962-06-01), Miller
patent: 3564903 (1971-02-01), Woodmansee et al.
patent: 3597962 (1971-08-01), Holtz
patent: 3623358 (1971-11-01), Sugimoto
patent: 3762496 (1973-10-01), Milberger et al.
patent: 3906803 (1975-09-01), Pike
patent: 3937065 (1976-02-01), Milberger et al.
patent: 4215583 (1980-08-01), Botsco et al.
patent: 4231259 (1980-11-01), Thiruvengadam et al.
patent: 4235113 (1980-11-01), Carome
patent: 4494410 (1985-01-01), Van Bochove et al.
patent: 4689993 (1987-09-01), Slettemoen
patent: 4806012 (1989-02-01), Meltz et al.
patent: 4836030 (1989-06-01), Martin
patent: 5029977 (1991-07-01), Wheeler et al.
patent: 5044205 (1991-09-01), Wolff et al.
patent: 5118931 (1992-06-01), Udd et al.
patent: 5182449 (1993-01-01), Johnson et al.
patent: 5184516 (1993-02-01), Blazic et al.
patent: 5195046 (1993-03-01), Gerardi et al.
patent: 5305507 (1994-04-01), Dvorsky et al.
patent: 5338928 (1994-08-01), Jamieson et al.
patent: 5410404 (1995-04-01), Kersey et al.
patent: 5513913 (1996-05-01), Ball et al.

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