scholarly journals A cyclic slip irreversibility based model for fatigue crack initiation of nickel base alloys

2017 ◽  
Vol 102 ◽  
pp. 1-8 ◽  
Author(s):  
H.S. Ho ◽  
M. Risbet ◽  
X. Feaugas
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Fatigue Crack Initiation ◽  
Cyclic Slip ◽  
Nickel Base

scholarly journals A cyclic slip irreversibility based model for fatigue crack initiation of nickel base alloys

2018 ◽  
Vol 165 ◽  
pp. 04002
Author(s):  
Hsin Shen Ho ◽  
Marion Risbet ◽  
Xavier Feaugas
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Plastic Strain ◽  
Fatigue Crack Initiation ◽  
C Value ◽  
Cyclic Slip ◽  
Crack Initiation Life ◽  
Cyclic Plastic Strain ◽  
Nickel Base ◽  
Two Parameter

The opportunity to define a microscopic law of fatigue crack initiation using Manson-Coffin law formulated in terms of cyclic slip irreversibility deduced from AFM measurements is discussed for a polycrystalline superalloy with different grain sizes and precipitate sizes. The results show that the modified Manson-Coffin law, relating cyclic slip irreversibility parameter to fatigue crack initiation life, is sustained through a two-parameter power law: ε′f and c. The analysis suggests that the exponent c-value can be related to the degree of plastic strain incompatibility between grains, and the cumulative irreversible cyclic plastic strain to crack initiation is a relevant damage indicator for crack initiation. Consequently, our approach allows giving a physical base of engineering law.

scholarly journals Microstructural statistics for fatigue crack initiation in polycrystalline nickel-base superalloys

2017 ◽  
Vol 208 (1-2) ◽  
pp. 221-240 ◽  
Author(s):  
J. C. Stinville ◽  
W. C. Lenthe ◽  
M. P. Echlin ◽  
P. G. Callahan ◽  
D. Texier ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Fatigue Crack Initiation ◽  
Polycrystalline Nickel ◽  
Nickel Base Superalloys ◽  
Nickel Base
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