Fiber Bragg grating sensor-based local crack real-time monitoring method
A technology of optical fiber Bragg and real-time monitoring, which is applied in the direction of optical testing flaws/defects, etc., and can solve the problems of complex equipment, lightness and insensitivity of monitoring
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[0039] The present invention will be further described in detail below with reference to the drawings and embodiments.
[0040] The present invention provides a real-time monitoring method for local cracks based on fiber Bragg grating sensors. The overall process diagram of the method is as follows figure 1 Shown. The method is specifically implemented through the following steps:
[0041] The first step is to perform a finite element analysis on the aluminum alloy plate with a central circular hole subjected to uniaxial fatigue load;
[0042] The most common structure and load situation in simulation engineering is that an infinite flat plate with a central circular hole is subjected to uniaxial fatigue load. This embodiment uses an aluminum alloy plate test piece with a size of 600mm×300mm×2mm, a hole with a diameter of 10mm is opened in the middle, and a 3mm notch is prefabricated on the edge of the hole by wire cutting. The maximum test stress is 75MPa, the stress ratio is 0.1...
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