AN ACCELERATED TEST METHOD FOR DETERMINING NEAR-THRESHOLD STRESS INTENSITY VALUES IN HSLA STEELS

1997 ◽  
Vol 20 (12) ◽  
pp. 1657-1664 ◽  
Author(s):  
G. Liu-Nash ◽  
J. A. Todd ◽  
S. Mostovoy
Keyword(s):  
Stress Intensity ◽  
Threshold Stress ◽  
Test Method ◽  
Threshold Stress Intensity ◽  
Accelerated Test ◽  
Hsla Steels ◽  
Near Threshold

Effect of Grain Size and Load Ratio on the near Threshold Stress Intensity Factor during Fatigue Crack Propagation of Dual Phase Steel

2012 ◽  
Vol 510-511 ◽  
pp. 67-74 ◽  
Author(s):  
M. Sarwar ◽  
E. Ahmad ◽  
T. Manzoor
Keyword(s):  
Stress Intensity Factor ◽  
Grain Size ◽  
Fatigue Crack ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Threshold Stress ◽  
Load Ratio ◽  
Threshold Stress Intensity ◽  
Threshold Stress Intensity Factor ◽  
Near Threshold

Fatigue crack growth near-threshold stress intensity factor is affected by the microstructure of the material. A large portion of microstructural influence is due to the change in grain size of the material. Grain size in the dual phase steel was varied and found that the near-threshold stress intensity factor (rKth) increased as the grain size increased. Influence of load ratio nearthreshold fatigue crack propagation was also studied. It was observed that the near-threshold stress intensity range, rKthfor fatigue growth decreased with increasing load ratio.

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