研究目的
To investigate the response of polymer packaged fiber Bragg grating (FBG) sensors embedded in the interface of a solid rocket motor combustor when subjected to tri-axial normal loadings, for monitoring the health of the motor.
研究成果
The proposed FBG sensing system can effectively measure bond stress at the propellant/insulation interface in SRMs. The center wavelength of the FBG is sensitive to stress in the Y-axis direction (radial stress), with good linearity, while stress in other directions may cause spectrum broadening. This system is suitable for health monitoring and defect detection in SRMs.
研究不足
The study is limited to simulations and laboratory tests on adhesive specimens; real-world application in actual SRMs may face challenges such as environmental factors and long-term durability. The viscoelastic properties of materials are simplified in simulations, potentially affecting accuracy.
1：Experimental Design and Method Selection:
The study uses finite element method (FEM) and computer simulation technology to simulate strain distribution and FBG spectrum under different normal loadings. Experimental validation is performed through axial and uniaxial tensile tests on adhesive specimens.
2：Sample Selection and Data Sources:
Adhesive specimens are designed according to Chinese aerospace industry standard QJ
3：1-2004, composed of steel shell, insulation, liner, and HTPB propellant with embedded FBG sensors. List of Experimental Equipment and Materials:
20 Includes FBG sensors, polymer packaging (HTPB/TDI elastic mass), steel plates, insulation (NBR), propellant, and adhesive layers. Specific equipment includes a monitoring system for reflection changes and tensile testing apparatus.
4：Experimental Procedures and Operational Workflow:
Stepwise stress tensile tests are conducted with cyclic loading and unloading at different angles. Strain and wavelength responses are measured and compared with simulations.
5：Data Analysis Methods:
Data is analyzed using linear fitting to relate wavelength shifts to stress, with software like ANSYS for FEM and Optigrating for optical spectrum simulation.
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