scholarly journals Crack initiation and propagation in uranium at elevated temperatures

1962 ◽  
Author(s):  
N. E. Daniel ◽  
F. R. Shober ◽  
E. L. Foster, Jr. ◽  
R. F. Dickerson
Keyword(s):  
Crack Initiation ◽  
Elevated Temperatures ◽  
Crack Initiation And Propagation ◽  
Initiation And Propagation

Notch Effect in Low-Cycle Fatigue at Elevated Temperatures—Life Prediction From Crack Initiation and Propagation Considerations

1986 ◽  
Vol 108 (4) ◽  
pp. 279-284 ◽  
Author(s):  
Masao Sakane ◽  
Masateru Ohnami
Keyword(s):  
Crack Initiation ◽  
Elevated Temperatures ◽  
Low Cycle Fatigue ◽  
Strain Range ◽  
Notch Effect ◽  
Cycle Fatigue ◽  
Crack Initiation And Propagation ◽  
Total Strain Range ◽  
Notched Specimens ◽  
Initiation And Propagation

This paper describes the notch effect in low-cycle fatigue of an austenitic stainless steel SUS 304 at 873 K in air. Total strain range-controlled tests were carried out using a round unnotched and three round notched specimens. A prediction method for low-cycle fatigue lives of notched specimens was developed by predicting the crack initiation and propagation periods separately. To predict the former Neuber’s rule was applied and a nominal stress/strain criterion was developed to predict the latter. Failure lives, obtained by adding the two prediction lives, closely agree with observed failure lives.

The Influence of Notches on Mechanical Behavior at Elevated Temperatures: Some Metallographic Observations

1968 ◽  
Vol 90 (1) ◽  
pp. 37-44 ◽  
Author(s):  
R. M. Goldhoff ◽  
A. J. Brothers
Keyword(s):  
Crack Initiation ◽  
Principal Stress ◽  
Elevated Temperatures ◽  
Maximum Principal Stress ◽  
Crack Initiation And Propagation ◽  
Metallographic Study ◽  
Initiation And Propagation ◽  
Section Size ◽  
Notch Geometry ◽  
Stress Components

A metallographic study of ruptured and unruptured notch bars is reported in this paper. The alloys are Cr-Mo-V steels tested in the range 1000–1050 deg F. Crack initiation and propagation in these alloys are studied as a function of the steel’s ductility with test bar section size and notch geometry as variables. It is shown that these factors interact in a complex way to control crack initiation and propagation. The mode and rate of crack initiation and propagation in ductile alloys depend mainly on shear processes although principal stress components are important under certain conditions. Alternatively, the maximum principal stress dominates the behavior in low ductility steels. In the former case, notched bar life is limited by crack propagation while in the latter case it is controlled by crack initiation. The influence of geometrical variables and metallurgical factors are discussed.

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