Based on the modularization and integration of self-diagnosing systems, the smart layer of a curvature fiber-optic sensor is developed by assigning sensors at two sides of PE films.It can measure curvature and torsion of the structure at the same time.A calibration method of the smart layer is proposed.Axial tension, compression test and three-point bending test are carried out on the electron omnipotence machine CMT6305, which show that the smart layer does affect the structural mechanics properties of fib...