Finite-Element-Based Fatigue Crack Growth Simulation in Real Structures

2003 ◽  
Vol 251-252 ◽  
pp. 79-84 ◽  
Author(s):  
M. Fulland ◽  
Hans A. Richard
Keyword(s):  
Finite Element ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Growth Simulation ◽  
Crack Growth Simulation

Fatigue Crack Growth Simulation Using S-Version FEM: Application to Interacting Subsurface Cracks

2017 ◽  
Vol 741 ◽  
pp. 82-87 ◽  
Author(s):  
Akiyuki Takahashi ◽  
Ayaka Suzuki ◽  
Masanori Kikuchi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Crack Depth ◽  
Growth Simulation ◽  
Subsurface Cracks ◽  
Crack Growth Simulation ◽  
Growth Evaluation

In this paper, fatigue crack growth simulation of interacting subsurface cracks using the s-version finite element method (SFEM) is presented. In order to evaluate the accuracy and reliability of the proximity rules published by the ASME, during the fatigue crack growth simulations, the subsurface cracks are approximated to either a single elliptical crack or semi-elliptical surface crack in accordance with the proximity rules. Then, the proximity rules are slightly modified for improving the accuracy and reliability. The results of crack depth evolution calculated by the SFEM with the use of the new proximity rules suggest that the approximation to deep cracks drastically improves the accuracy of the fatigue crack growth evaluation. Thus, the approximation to deep cracks must be a promising approach for having better evaluation of fatigue crack growth of subsurface cracks.

Fatigue Crack Growth Analysis of Interacting Subsurface Cracks Using S-Version FEM

2016 ◽  
Author(s):  
Ayaka Suzuki ◽  
Akiyuki Takahashi ◽  
Masanori Kikuchi
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Fem Simulation ◽  
Crack Growth Behavior ◽  
Surface Cracks ◽  
Direct Simulation ◽  
Growth Simulation ◽  
Subsurface Cracks ◽  
Crack Growth Simulation

Fatigue crack growth simulation using the s-version finite element method (FEM) is presented. Two subsurface cracks are aligned in the depth direction of a specimen, and is subjected to a cyclic tension-tension loading. The fatigue crack growth behavior of the cracks is directly simulated using our automatic fatigue crack growth simulation system with the s-version FEM. Along with the direct simulation, proximity rules for crack combinations and surface cracks are used in the s-version FEM simulation. The numerical results with and without the application of the proximity rules are compared to make a validation of the application of the proximity rules in the evaluation of fatigue crack growth behaviors and residual fatigue life. The results clearly illustrate that the proximity rules accelerate the fatigue crack growth rate, and provide us with a substantially conservative evaluation. Finally, the proximity rules are slightly modified for making better approximation of combining and surface cracks. It can be found that the new proximity rules are able to give a fatigue crack growth evaluation closer to the direct simulation results.

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