Under cyclic loading, will the optical fiber grating fracture or fail?
Under cyclic loading, bare optical fibers, including those with Fiber Bragg Gratings (FBGs), can experience fatigue and potential fracture over time, especially if subjected to high strain amplitudes, abrasive environments, or if the protective coating is damaged. The long-term reliability is influenced by the fiber’s intrinsic strength, the quality of its coating, and the environmental conditions.
To enhance durability and fatigue life, especially in harsh or cyclically loaded environments, OFSCN® offers specialized solutions:
- High-Strength Bare FBGs: Our OFSCN® High-Strength Fiber Bragg Gratings / Fiber Bragg Grating Strings (Bare) utilize high-strength polyimide-coated optical fibers, designed to withstand larger strain ranges (≥25000με) and a wider temperature range (-200℃ to 300℃), which inherently improves their resistance to fatigue compared to standard acrylate-coated fibers.
- Packaged FBG Sensors: For applications requiring even greater robustness and protection against mechanical stress, abrasion, and harsh environments, we recommend packaged FBG sensors. For instance, the OFSCN® Alloy Tube Packaged Fiber Bragg Grating strain sensor employs a full metal seamless tube encapsulation. This packaging significantly isolates the optical fiber from direct external forces, preventing creep from adhesives and enhancing its mechanical stability and fatigue resistance, making it ideal for long-term monitoring under demanding conditions such as high temperatures or welding installations.
Here are some standard product images for reference:
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