Abstract
This paper proposes the use of FBG (Fiber Bragg grating) sensors for SRM (Solid Rocket Motor) grain structure continuous Structural Health Monitoring(SHM) as they are generally considered as the preferable solution in flammable and explosive environments, due to their electromagnetic interference immunity and their inherent electrical and explosion safe characteristics. The processes of SRM manufacturing(curing of propellant and demoulding) were monitored. The curing degree of the propellant can be monitored by wavelength change of the FBG sensors, and this provides a new monitoring method for curing of the propellant grain. The monitoring of the demoulding process shows that the sensor is very sensitive to the tensile and compressive stresses on grain and can be used for on-line monitoring of grain in a mechanical environment. In monitoring simulated debonding test, the failure process of crack initiation, expansion and direction all can be monitored by the FBG sensors. After the crack is produced, the location of the debonding can be determined by the variation of the different sensors.
Highlights
Rocket motors are one of the largest items that dictate missile system service life
Fiber Bragg grating (FBG) strain sensors, have received some attention, optical sensors are considered as the preferable solution in such environments, due to their electromagnetic interference immunity and their inherent electrical and explosion safe characteristics
This paper proposes a new method using fiber Bragg gratings by polymer packaging sensors for measuring the bond stress between the propellant and insulation
Summary
Rocket motors are one of the largest items that dictate missile system service life. structure health monitoring is of significant interest for the safety and reliability of solid rocket motors (SRMs)[1]. Lopatin and Grinstein [7] recently introduced an active sensing method, by combining the magnetic induction for excitation and optical fiber Bragg grating sensors, for monitoring the integrity of solid propellant without implementing electrical wires into the rocket motor. These fiber Bragg technologies have been demonstrated as a means to study grain integrity. This paper proposes a new method using fiber Bragg gratings by polymer packaging sensors for measuring the bond stress between the propellant and insulation. The FBG sensors were coated by wafers’ package of HTPB/TDI elastic mass
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