Material Fatigue Behavior and its Mechanism Based on MMM Technology

Abstract:

In order to investigate material behavior at the stage of early fatigue damage and critical fatigue fracture, a new nondestructive testing called metal magnetic memory (MMM) technology, has been introduced in this paper. The fatigue experiments are carried out on the PQ1-6 rotary bending fatigue machine. The MMM fatigue characteristics are presented and analyzed. It has been found that Hp(x) is increasing up to the peak value while the fatigue crack is initiating and growing. After that peak, Hp(x) decreases gradually with the fatigue crack deepening and stress releasing. The gradual increasing Hp(x) is the sign of the early fatigue damage and the Hp(x) peak predicts the critical fracture state. The validity of MMM results has been certified by microscopic metallographic examination. Furthermore, the MMM fatigue behavior is deduced theoretically based on the dislocation mechanics and fracture mechanics.

• Periodical: Advanced Materials Research (Volumes 146-147)
• Pages: 408-411
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.146-147.408
• Online since: October 2010
• Authors: Hai Yan Xing, Da Bo Wu, Min Qiang Xu
• Keywords: Fatigue Fracture, Mechanical Behavior, Metal Magnetic Memory Testing

References

[1] Dubov A.A. Study of metal properties using metal magnetic memory method [A]. (7th European Conference on Non-destructive Testing [C]. Copenhagen 1997, (10): 920~927. ).

[2] Doubov, A.A. Diagnostics of metal items and equipment by means of metal magnetic memory [A]. (ChS NDT 7th Conference on NDT and International Research Symposium [C]. Shantou China, 1999, 181-187. ).

[3] Doubov A.A. A technique for monitoring the bends of boiler and steam-line tubes using the magnetic memory of metal [J]. (Thermal Engineering. 2001, 48(4): 289~295. ).

[4] Dubov, A.A. Problems in estimating the remaining life of aging equipment [J]. (Thermal Engineering. 2008, 50(11): 935-938. ).