Effects of Grain Size on Fatigue Strength of Notched Specimen : Part 2, On Non-propagating Fatigue Crack

煕明, 福原

doi:10.1299/kikai1938.38.1647

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“…There have been a number of studies regarding the effect of grain size on the fatigue strength of a low-carbon steel. From the results of these studies, it has been established that the fatigue limit of a plain specimen increases as grain size becomes smaller [2][3][4][5][6][7], that the S-N curve exhibits increased fatigue resistance as grain size becomes smaller [8], that the crack growth rate has some dependency on grain size [9] and that the fatigue limit of specimens with a very sharp notch has little dependency on grain size [24]. Taira et al also reported on the dependency of grain size for the limited stress range over which slip bands initiated and a fatigue crack initiated [6].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Initiation and Propagation in a Low‐carbon Steel of Two Different Grain Sizes

Kage

Miller

Smith

1992

Fatigue Fract Eng Mat Struct

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Rotary bending fatigue tests were carried out using both plain and notched specimens of a low-carbon steel with two different grain sizes (1 5 and 50 pm). The process of early crack development was observed by the replication method. The effect of grain size on crack development was studied.The main conclusions were as follows. (I) Fatigue resistance, in terms of the relative positions of the S-N curves, increases with decreasing grain size. This phenomenon is related to the number of cycles to propagate a crack to failure and the condition for the non-propagation of a fatigue crack. (2) The size of a non-propagating crack, which initiates below the fatigue limit, tends to become larger as grain size increases.(3) The difference in fatigue behaviour between small (15pm) and large (50pm) grain sized specimens is due both to a decrease in crack propagation rate and a smaller non-propagating crack limit in the finer grained material.

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