Research on Coordinating Deformation Between Fiber Bragg Grating Strain Sensor and Asphalt Mixture

The research on the coordinating deformation between the Fiber Bragg Grating strain sensor(FBG) and asphalt mixture is the precondition and foundation to solve the application of the FBG in asphalt pavement.The testing method about the coordinating deformation between them was designed,the viscoelastic parameters of asphalt mixture was obtained by dynamic single axle-load creep test and a 3D finite element model with ABAQUS software was established to analyze the stress and strain fields redistribution close to the location of the FBG and the plastic deformation of asphalt mixture due to the existing of high-modulus FBG,and the influence of the modulus of the FBG on the strain and stress fields was discussed.The result indicates that the existence of high modulus sensor results in the redistribution of stress and strain fields,but it cannot limit the plastic deformation development of the asphalt mixture;the stress and strain fields are more sensitive to the modulus of the sensor,with the decrease of the sensor modulus,the influences on the result decreases gradually.At last,we may obtain the influence curve of the strain field under different sensor modulus and modified the measured information obtained by FBG to get the precise strain result.