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Study on Crack Growth Behavior of High Co-Ni Steel Under Non-constant Impact Fatigue Load
Author(s): 
Pages: 88-90
Year: Issue:  4
Journal: Hot Working Technology

Keyword:  high Co-Ni steelnon-constant impact fatiguecrack growth;
Abstract: The crack growth behavior of single-edge notched specimens of high Co-Ni steel using three-point bend impact fatigue method under non-constant energy was studied. The results show that there is a platform on the a-N curve while the impact energy changes from high-energy into low-energy, and the crack growth rate degreases greatly. The hysteresis life △N is power function increasing with non-constant impact energy difference △A. The hysteresis effect is related with crack closure effect. When the impact energy changes from low-energy into high-energy, the crack growth rate is equal with constant amplitude impact under correspond energy.
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