FATIGUE CRACK INITIATION AND PROPAGATION IN LASER-HARDENED, MEDIUM-CARBON STEEL

1992 ◽  
Vol 15 (12) ◽  
pp. 1237-1249 ◽  
Author(s):  
S. Kocanda ◽  
D. Natkaniec
Keyword(s):  
Fatigue Crack ◽  
Carbon Steel ◽  
Crack Initiation ◽  
Fatigue Crack Initiation ◽  
Medium Carbon Steel ◽  
Crack Initiation And Propagation ◽  
Medium Carbon ◽  
Initiation And Propagation

Fatigue Behavior of Medium Carbon Steel by Symmetric Bending Ultrasonic Frequency Method

2011 ◽  
Vol 393-395 ◽  
pp. 102-105
Author(s):  
Wei Wei Tang ◽  
Hong Wang ◽  
Jin Gan Dai
Keyword(s):  
Fatigue Crack ◽  
Carbon Steel ◽  
Crack Initiation ◽  
Fatigue Behavior ◽  
Fatigue Crack Initiation ◽  
Medium Carbon Steel ◽  
Fatigue Properties ◽  
Ultrasonic Frequency ◽  
Frequency Method ◽  
Medium Carbon

The S-N curves of medium carbon steel(MCS) are determined by the ultrasonic symmetric bending fatigue system (20 KHz). The results show that two S-N curves of MCS display the characteristic of “continually decreasing type” up to 109 cycles and exhibit no traditional horizontal plateau beyond 106 cycles. When the fatigue cycles are over 109, fatigue failure do occurs. By comparison of the two curves of 2mm thick and 5mm thick MCS, the results show that in the high-cycle stage(107cycles), size effect has no significant impact on fatigue Properties. This can also be explained by the theory of crack initiation, in high cycle stage, fatigue crack initiation exists in the sample surface, and in ultra-high-cycle stage, fatigue crack initiation exists in internal initiation.

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