Stochastic modeling of fatigue crack dynamics for on-line failure prognostics

1996 ◽  
Vol 4 (4) ◽  
pp. 443-451 ◽  
Author(s):  
A. Ray ◽  
S. Tangirala
Keyword(s):  
Fatigue Crack ◽  
Stochastic Modeling ◽  
Crack Dynamics ◽  
On Line ◽  
Failure Prognostics

An Experimental Study of Breathing Mechanism for the Transversely Cracked Shafts

2011 ◽  
Vol 338 ◽  
pp. 547-552
Author(s):  
He Len Wu ◽  
Zhong Yi Cai ◽  
Ke Qin Xiao
Keyword(s):  
Fatigue Crack ◽  
Diagnostic Techniques ◽  
Transverse Cracks ◽  
On Line ◽  
Stiffness Variation ◽  
Heavy Loads ◽  
Opening And Closing ◽  
Cracked Shafts ◽  
Breathing Mechanism ◽  
Line Crack

Shaft fatigue crack is one of the most common defects in rotating equipment, due to its extensive operation with continuous heavy loads. Finding an efficient way to evaluate the true stiffness variation due to the crack rotation is the key step to develop both on-line and off-line crack diagnostic techniques. This study analyzed time-variant bending stiffness of elastic shafts with experimentally-induced fatigue, welding and wire cut transverse cracks. It was found that crack gap has a significant effect on the opening and closing behaviour of the transverse crack. As in the case of a cut crack, large crack gap could completely prevent the crack from closing during rotation. A fatigue crack without a clear gap shows a typical opening and closing behavior. Further, it remains fully closed within a small angular range and most of time it is partially closed. It was also observed that both switch and harmonic models cannot describe periodic stiffness variation well enough to represent the actual breathing function of the fatigue crack.

scholarly journals Stochastic modeling of fatigue crack propagation

1998 ◽  
Vol 22 (3) ◽  
pp. 197-204 ◽  
Author(s):  
Asok Ray ◽  
Sekhar Tangirala ◽  
Shashi Phoha
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Stochastic Modeling

Stochastic modeling of fatigue crack growth

1988 ◽  
Vol 29 (3) ◽  
pp. 317-334 ◽  
Author(s):  
Keith Ortiz ◽  
Anne S. Kiremidjian
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Stochastic Modeling
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