Elasto-Plastic Bonding of Embedded Optical Fiber Sensors in Concrete

摘要: Fiberoptic sensors are increasingly employed for sensing and measurement of strains in structural materials. The glass core the optical fiber senses strain through intensity fluctuations, interference, or frequency modulation. Brittleness limits practical usage, therefore, fibers is coated with low modulus softer protective coatings. coating alters transduction capabilities sensor. It absorbs a portion strain, hence only segment sensed. study reported here corrects this error development theoretical model to account loss fiber. considers as an elasto-plastic material formulates transfer coefficients elastic, elasto-plastic, plastic phases deformation. findings were verified laboratory experimentation. experimental program involved fabrication interferometric sensors, embedment within mortar samples, tensile tests closed-loop servo-hydraulic testing machine. developed correction sensor data results compared conventional extensometers.