Creep-Fatigue-Environment Crack Tip Kinetics of Ni-Base Superalloys

2014 ◽  
Vol 3 (2) ◽  
pp. 20130026 ◽  
Author(s):  
Jeffrey L. Evans
Keyword(s):  
Crack Tip ◽  
Creep Fatigue ◽  
Kinetics Of

Effect of Constraint Induced by Specimen Geometries on Crack Growth Behavior Under Creep-Fatigue Interaction

2018 ◽  
Author(s):  
Lei Zhao ◽  
Lianyong Xu
Keyword(s):  
Growth Rate ◽  
Crack Growth Rate ◽  
Crack Growth ◽  
Growth Rates ◽  
Crack Tip ◽  
Crack Growth Behavior ◽  
Growth Behaviour ◽  
Crack Growth Behaviour ◽  
Creep Fatigue ◽  
Crack Growth Rates

Creep-fatigue interaction would accelerate the crack growth behaviour and change the crack growth mode, which is different from that presenting in pure creep or fatigue regimes. In addition, the constraint ahead of crack tip affects the relationship between crack growth rate and fracture mechanics and thus affects the accuracy of the life prediction for high-temperature components containing defects. In this study, to reveal the role of constraint caused by various specimen geometries in the creep-fatigue regime, five different types of cracked specimens (including C-ring in tension CST, compact tension CT, single notch tension SENT, single notch bend SENB, middle tension MT) were employed. The crack growth and damage evolution behaviours were simulated using finite element method based on a non-linear creep-fatigue interaction damage model considering creep damage, fatigue damage and interaction damage. The expression of (Ct)avg for different specimen geometries were given. Then, the variation of crack growth behaviour with various specimen geometries under creep-fatigue conditions were analysed. CT and CST showed the highest crack growth rates, which were ten times as the lowest crack growth rates in MT. This revealed that distinctions in specimen geometry influenced the in-plane constraint level ahead of crack tip. Furthermore, a load-independent constraint parameter Q* was introduced to correlate the crack growth rate. The sequence of crack growth rate at a given value of (Ct)avg was same to the reduction of Q*, which shown a linear relation in log-log curve.

Steady-state electrochemical kinetics of structural steel in simulated fatigue crack-tip environments

1988 ◽  
Vol 28 (10) ◽  
pp. 1029-1038 ◽  
Author(s):  
A. Turnbull ◽  
M. Saenz de Santa Maria ◽  
N.D. Thomas
Keyword(s):  
Fatigue Crack ◽  
Steady State ◽  
Structural Steel ◽  
Crack Tip ◽  
Electrochemical Kinetics ◽  
Kinetics Of

Kinetics of Crack Tip Blunting of Glasses

1987 ◽  
Vol 70 (1) ◽  
pp. 43-48 ◽  
Author(s):  
KAZUYUKI HIRAO ◽  
MINORU TOMOZAWA
Keyword(s):  
Crack Tip ◽  
Kinetics Of ◽  
Crack Tip Blunting
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