High Sensitive Methods for Health Monitoring of Compressor Blades and Fatigue Detection

Figure 12

Showing (a) influence of static strain hardening on magnetic parameters low carbon steel with 0,17% C (𝐻_𝑚=𝐻(𝜇_𝑟max)),𝑑Par=(Par(𝜀)−Par(𝜀=0)/Par(𝜀=0)) [73]; (b) influence of HCF on TEM microstructure of fatigue 430 stainless steel (after 0 cycles, 1×10³ cycles, 1×10⁴ cycles, 2×10⁴ cycles, 4×10⁵ cycles, 5×10⁵ cycles) and remanence magnetization map of the steel (after: (A) 0 cycles, (B) 1×10³ cycles; (C) 5×10³ cycles; (D) 2×10⁴ cycles; (E) 1,2×10⁵ cycles; (F) 1,45×10⁵ cycles; (G) 2,8×10⁵ cycles; (H) 9,2×10⁴ cycles. SQUID scanning area 10×20 mm) [74].

(a)

(b)