scholarly journals Numerical simulation of fatigue crack propagation under superimposed stress histories containing different frequency components with several mean stress conditions

2015 ◽  
Vol 41 ◽  
pp. 77-95 ◽  
Author(s):  
Kazuki Matsuda ◽  
Koji Gotoh
Keyword(s):  
Numerical Simulation ◽  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Stress Conditions ◽  
Mean Stress ◽  
Frequency Components

Numerical Simulation of Fatigue Crack Propagation Under Simulated Whipping Loading Arising in Hull Structures

2013 ◽  
Author(s):  
Kazuki Matsuda ◽  
Koji Gotoh
Keyword(s):  
Numerical Simulation ◽  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Loading History ◽  
Stress Criterion ◽  
Fatigue Crack Propagation Behavior ◽  
Propagation Behavior ◽  
Cycle Count ◽  
Frequency Components

Fatigue crack propagation behavior under simulated whipping loadings which contain two different frequency components is highlighted. Numerical simulation of fatigue crack propagation based on an advanced fracture mechanics approach using the RPG (Re-tensile Plastic zone Generating) stress criterion for fatigue crack propagation is improved to enable the extraction of the effective loading history. The critical value of the plastic hysteresis for the stress versus strain relationship occurring in the vicinity of a crack tip is defined as the control parameter for extracting the effective loading history. Comparison of fatigue crack propagation curves obtained from the improved numerical simulations with the measurements which were conducted by Sumi (2010) is performed. These comparisons show the validity of the proposed procedure for extracting the effective loading history from the superposed loading history containing different frequencies. In addition, imperfection of the S-N curves approach, which corresponds to the combination of the linear cumulative damage law and the loading cycle count by the rain flow method, is conducted.

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