13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- 1 0 0 1 max 1 1 m th m K E R W f d C W N w . (11) This equation overcame the limitation that the patch requires two or more materials with different fatigue characteristics. Estimation map of fatigue cycles and stress amplitude of steel structure as a function of normalized crack length in two sensors made of same material are shown in Fig. 11. The new equation needs only one material for simultaneous estimation of fatigue cycles and stress amplitude, and the measuring range can be controlled by geometry of specimen. Since this patch needs neither power supply nor wiring, it provides a great potential for long-term structural health monitoring with easy maintenance and low cost. Figure 7. Schematic of simple model for the attached sensor to structure. Figure 8. Estimation map of (a) fatigue cycles and (b) stress amplitude of steel structure as a function of normalized crack length in two sensors consisted of different materials. Figure 9. (a) S-N curve of FAT100 (Fatigue strength at two million cycles is 100 MPa), (b) Estimation map of the amount of fatigue damage as a function of normalized crack length in two sensors.
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