FEM Simulation of Fish-eye Crack Growth in the Very High Cycle Fatigue of a High Strength Steel

Fatigue characteristics of bearing steel in very high cycle fatigue

“…5. Although the plotted data are scattered at each stress level, these results are similar to those of other researchers [1,3]. Most of the surface fracture modes are plotted in the short fatigue life, while most of the fish-eye fracture modes belong to the long fatigue life (VHCF) range.…”

“…The initial crack that leads to final fatigue fracture is affected by a fish-eye crack from a chromium oxide inclusion. This pattern was observed by many researchers [1,[3][4][5][6]. Fig.…”

“…Fig. 9 shows the relationship between the radius of fish-eye crack a or b and its depth d. In this figure, we plotted the Nakasone data [3] for comparison. The radii a and b of fish-eye are almost equal to both data and also to its diameter.…”

“…According to recent industrial development, the VHCF behavior of materials in the super-long life range (N>10 7 ) has received attention with regard to safety in the design and reliability of machine elements [1][2][3][4][5][6][7][8]. Also, for many applications, the understanding of 10 9 (giga) cycle fatigue in materials becomes extremely important [10].…”

“…For high strength steels such as bearing steel, SNCM 439, SCM 435 and 0.46C steel were used for super-long life fatigue tests [1][2][3][4]. Some researchers reported that high strength steel and surface hardened steel indicated that the S-N curves obtained from the fatigue tests tended to come down again in the super-long life range due to fish-eye type internal cracking [1,3,14].…”