研究目的
To study the strain transfer mechanism between a host material and an optical fiber, proposing a new analytical model for imperfect bonding between layers and establishing a general expression of the crack-induced strain transfer in a multilayer system.
研究成果
The proposed strain transfer model for multilayer systems with imperfect interfacial bonding effectively describes the crack-induced strain distribution, allowing for precise crack opening estimations. The model's applicability was validated through experimental tests, showing low relative errors in crack opening measurements. The strain lag parameter's evolution provides insights into the system's condition, highlighting the importance of continuous monitoring for structural health assessment.
研究不足
The model's validity is limited to crack openings within a certain range (CODmax), beyond which the optical cables exhibit post-plastic nonlinear behavior. The accuracy decreases for crack openings less than 50 μm due to measurement system limits and material micro discontinuities.
1：Experimental Design and Method Selection:
The study involved performing wedge splitting tests on concrete specimens instrumented with embedded and surface-mounted fiber optic cables to validate the new strain transfer model.
2：Sample Selection and Data Sources:
Concrete specimens with dimensions 800 mm×800 mm×20 mm were used, equipped with different types of optical cables.
3：List of Experimental Equipment and Materials:
Optical cables (Polyimide, Acrylate A1 and A2, Hytrel, FutureNeuro, etc.), LVDT sensors, ODISI–B interrogation unit.
4：Experimental Procedures and Operational Workflow:
The tests were controlled under a vertical displacement rate of 0.2 mm/min until crack openings reached at least 2 mm, with continuous measurements at 20 Hz.
5：2 mm/min until crack openings reached at least 2 mm, with continuous measurements at 20 Hz.
Data Analysis Methods:
5. Data Analysis Methods: The strain spatial distribution was measured and fitted using the proposed analytical model to estimate crack openings and the strain lag parameter.
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