In order to clarify the physical background of the scatter in fatigue behaviour, rotary bending fatigue tests are carried out using smooth speciments of a medium carbon steel with two kinds of grain sizes. The statis...In order to clarify the physical background of the scatter in fatigue behaviour, rotary bending fatigue tests are carried out using smooth speciments of a medium carbon steel with two kinds of grain sizes. The statistical characteristics of short carck initiation and growth lives are investigated by a new definition of short fatigue crack initiation. Detailed analysis reveals that the distribution of short crack initiation life can be expressed by two or threeparameter Weibull distribution, and the threeparameter Weibull distribution is well fitted to the distribution of short crack growth life, and the grain size and stress level have a great influence on the statistical characteristics of crack initiation and growth life.展开更多
Rotary bending fatigue tests were carried out by using smoothspecimens of medium car- bon steel with two ferrite grain sizes. Inorder to clarify the physical background of the scatter in fa- tiguebehavior, the statist...Rotary bending fatigue tests were carried out by using smoothspecimens of medium car- bon steel with two ferrite grain sizes. Inorder to clarify the physical background of the scatter in fa- tiguebehavior, the statistical characteristics of the initiation andgrowth of short fatigue crack were in- vestigated. Results show thatthe short crack initiation and growth life distribution can beexpressed by two-or three-parameter Weibull distribution. The Weibulldistribution of the mixed type is well fitted to the crack lengthdistribution for both steels. The knee values of Weibull plots arerelated to the grain size.展开更多
文摘In order to clarify the physical background of the scatter in fatigue behaviour, rotary bending fatigue tests are carried out using smooth speciments of a medium carbon steel with two kinds of grain sizes. The statistical characteristics of short carck initiation and growth lives are investigated by a new definition of short fatigue crack initiation. Detailed analysis reveals that the distribution of short crack initiation life can be expressed by two or threeparameter Weibull distribution, and the threeparameter Weibull distribution is well fitted to the distribution of short crack growth life, and the grain size and stress level have a great influence on the statistical characteristics of crack initiation and growth life.
文摘Rotary bending fatigue tests were carried out by using smoothspecimens of medium car- bon steel with two ferrite grain sizes. Inorder to clarify the physical background of the scatter in fa- tiguebehavior, the statistical characteristics of the initiation andgrowth of short fatigue crack were in- vestigated. Results show thatthe short crack initiation and growth life distribution can beexpressed by two-or three-parameter Weibull distribution. The Weibulldistribution of the mixed type is well fitted to the crack lengthdistribution for both steels. The knee values of Weibull plots arerelated to the grain size.
