Fatigue Life Prediction at Fish-eye Type Fracture of High Strength Steel Based on Internal Crack Growth Properties

Ihara, Satoshi; Okagawa, Yumiko; Kuroshima, Yoshihito; Harada, Syoji

doi:10.1299/jsmemecjo.2000.3.0_141

Cited by 1 publication

(3 citation statements)

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“…7. This diagram for internal crack propagation is similar to the one proposed by Kuroshima et al 15,16 . The crack propagation in the FCT region is called Stage I and the crack propagation outside the FCT region is called Stage II in the present paper.…”

Section: Estimation Of Crack Propagation Lawsupporting

confidence: 66%

“…Kuroshima et al . 15,16 experimentally obtained a similar growth law for internal cracks in Stage I of a low alloy steel. A direct confirmation of the crack propagation law in the present material is necessary in the future.…”

Section: Estimation Of Crack Propagation Lawmentioning

confidence: 55%

“…Figure 9 shows the crack propagation law for the bearing steel determined from the S±N data as described above. Kuroshima et al 15,16 experimentally obtained a similar growth law for internal cracks in Stage I of a low alloy steel. A direct confirmation of the crack propagation law in the present material is necessary in the future.…”

Section: Estimation Procedures and Resultsmentioning

confidence: 74%

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Fatigue crack propagation behaviour derived from S–N data in very high cycle regime

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The crack propagation law was derived from the S–N data in the very high cycle fatigue of a bearing steel. The propagation rate, da/dN (m/cycle), of surface cracks was estimated to be a power function of the stress intensity range, ΔK (MPa√m) with the coefficient Cs = 5.87 × 10−13 and the exponent ms = 4.78. The threshold stress intensity range was 2.6 MPa√m. The crack propagation from internal inclusions was divided into Stages I and II. For Stage I, the coefficient of the power law was C0 = 3.44 × 10−21 and the exponent m0 = 14.2. The transition from Stage I to II took place at ΔK = 4.0 MPa√m. For Stage II, the coefficient was Ci = 2.08 × 10−14 and the exponent mi = 4.78. The specimen size and loading mode did not influence the surface fatigue life, while the internal fatigue life was shortened in larger specimens and under tension–compression loading. For ground specimens, the surface fatigue life was raised by the compressive residual stress, while reduced by the surface roughness introduced by grinding. For shot‐peened specimens, fatigue fracture did not take place from the surface because of a high surface compressive residual stress. The internal fatigue life was reduced by the tensile residual stress existing in the interior of the specimens.