scholarly journals Finite Element Simulation for Creep Crack Growth.

1992 ◽  
Vol 41 (464) ◽  
pp. 643-647 ◽  
Author(s):  
Noriyuki MIYAZAKI ◽  
Toru SASAKI ◽  
Michihiko NAKAGAKI ◽  
F.W. BRUST
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Crack Growth ◽  
Creep Crack Growth ◽  
Creep Crack ◽  
Element Simulation

scholarly journals Finite element simulation of creep crack growth using combined plastic-creep damage model

2016 ◽  
Vol 2 ◽  
pp. 825-831 ◽  
Author(s):  
Dong-Jun Kim ◽  
Kyung-Dong Bae ◽  
Han-Sang Lee ◽  
Yun-Jae Kim ◽  
Goon-Cherl Park
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Crack Growth ◽  
Damage Model ◽  
Creep Crack Growth ◽  
Creep Damage ◽  
Creep Crack ◽  
Element Simulation ◽  
Creep Damage Model ◽  
Plastic Creep

Finite Element Simulation of Stable Fatigue Crack Growth Using Critical CTOD Determined by Preliminary Finite Element Analysis

2014 ◽  
Vol 891-892 ◽  
pp. 1675-1680
Author(s):  
Seok Jae Chu ◽  
Cong Hao Liu
Keyword(s):  
Finite Element ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Finite Element Simulation ◽  
Crack Growth ◽  
Crack Tip ◽  
Stress Intensity Factor Range ◽  
Crack Tip Opening Displacement ◽  
Element Analysis ◽  
Element Simulation

Finite element simulation of stable fatigue crack growth using critical crack tip opening displacement (CTOD) was done. In the preliminary finite element simulation without crack growth, the critical CTOD was determined by monitoring the ratio between the displacement increments at the nodes above the crack tip and behind the crack tip in the neighborhood of the crack tip. The critical CTOD was determined as the vertical displacement at the node on the crack surface just behind the crack tip at the maximum ratio. In the main finite element simulation with crack growth, the crack growth rate with respect to the effective stress intensity factor range considering crack closure yielded more consistent result. The exponents m in the Paris law were determined.

Experimental Determination of Elastic and Plastic LLD Rates During Creep Crack Growth Testing

2017 ◽  
Author(s):  
K. M. Tarnowski ◽  
C. M. Davies ◽  
K. M. Nikbin ◽  
D. W. Dean
Keyword(s):  
Finite Element ◽  
Crack Growth ◽  
Creep Crack Growth ◽  
Current Method ◽  
Creep Crack ◽  
Load Line ◽  
Load Line Displacement ◽  
Final Failure ◽  
Complex Crack

Elastic and plastic load line displacement (LLD) rates are often ignored when analyzing Creep Crack Growth (CCG) tests due to difficulties in accurately determining their value for complex crack morphologies typical of creep. Instead, the total LLD rate is assumed to be entirely due to creep. This simplistic approach overestimates the crack tip characterizing parameter C* which is non-conservative. This paper presents a review of the current method of interpreting CCG test data in ASTM E1457 and proposes an improved approach which accounts for the elastic and plastic LLD rates. Estimations of the elastic and plastic LLD rate are obtained from a partial unload immediately after load-up and a full unload, at the end of the test, prior to final failure. Some finite element validation of this method is presented. Implementing this approach will facilitate more realistic CCG laws.

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