Crack growth simulation in heterogeneous material by S-FEM and comparison with experiments

2016 ◽  
Vol 167 ◽  
pp. 239-247 ◽  
Author(s):  
Masanori Kikuchi ◽  
Yoshitaka Wada ◽  
Yulong Li
Keyword(s):  
Crack Growth ◽  
Heterogeneous Material ◽  
Growth Simulation ◽  
Crack Growth Simulation ◽  
Comparison With Experiments

Crack growth simulation in heterogeneous material by S-FEM and comparison with experiments

2015 ◽  
Author(s):  
Masanori Kikuchi ◽  
Yoshitaka Wada ◽  
Yulong Li
Keyword(s):  
Aluminum Alloy ◽  
Crack Growth ◽  
Mixed Mode ◽  
Heterogeneous Material ◽  
Initial Crack ◽  
Growth Path ◽  
Growth Simulation ◽  
Crack Growth Simulation ◽  
Cfrp Plate ◽  
Crack Growth Path

Fully automatic fatigue crack growth simulation system is developed using S-version FEM (SFEM). This system is extended to fracture in heterogeneous material. In the heterogeneous material, crack tip stress field becomes mixed mode condition, and crack growth path is affected by inhomogeneous materials and mixed mode conditions. Stress Intensity Factors (SIF) in mixed mode condition are evaluated using Virtual Crack Closure Method (VCCM). Criteria for crack growth amount and crack growth path are used based on these SIFs, and growing crack configurations are obtained. Three crack growth problems are simulated. One is crack growth in bi-materila made of CFRP plate and Aluminum alloy. Initial crack is located in CFRP plate, and grows toward Aluminum alloy. Crack growing direction changes and results are compared with experimental one. Second problem is crack growth in bimaterial made of PMMA and Aluminum alloy. Initial crack is located in PMMA plate and parallel to phase boundary. By cahnging loading conditions, several cases are simulated and compared with experimental ones. In the experiment, crack grows into pahse boundary and grow along it. This case is simulated precisely, and the effect of pahse boundary is discussed. Last case is Stress Corrosion Cracking (SCC) at Hot-Leg Safe-End of Pressurized Water Rreactor. This location is made of many kinds of steels by welding. In some steel, SCC does not occur and in other steel, SCC is accelerated. As a result, small surface crack grows in complicated manner.

Fatigue crack growth simulation in heterogeneous material using s-version FEM

2014 ◽  
Vol 58 ◽  
pp. 47-55 ◽  
Author(s):  
Masanori Kikuchi ◽  
Yoshitaka Wada ◽  
Yuichi Shintaku ◽  
Kazuhiro Suga ◽  
Yulong Li
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Heterogeneous Material ◽  
Growth Simulation ◽  
Crack Growth Simulation

Mixed-mode crack growth simulation in aviation engine compressor disk

2021 ◽  
Vol 246 ◽  
pp. 107617
Author(s):  
V. Shlyannikov ◽  
R. Yarullin ◽  
M. Yakovlev ◽  
V. Giannella ◽  
R. Citarella
Keyword(s):  
Crack Growth ◽  
Mixed Mode ◽  
Growth Simulation ◽  
Crack Growth Simulation ◽  
Mixed Mode Crack ◽  
Engine Compressor ◽  
Compressor Disk

Ductile Damage Model Based On Void Growth Analysis for Application to Ductile Crack Growth Simulation

2021 ◽  
Author(s):  
Takehisa Yamada ◽  
Mitsuru Ohata
Keyword(s):  
Crack Growth ◽  
Void Growth ◽  
Damage Evolution ◽  
Damage Model ◽  
Crack Growth Resistance ◽  
Growth Behavior ◽  
Ductile Crack ◽  
Growth Simulation ◽  
Crack Growth Simulation ◽  
Ductile Crack Growth

Abstract The aim of this study is to propose damage model on the basis of the mechanism for ductile fracture related to void growth and to confirm the applicability of the proposed model to ductile crack growth simulation for steel. To figure out void growth behavior, elasto-plastic finite element analyses using unit cell model with an initial void were methodically performed. From the results of those analyses, it was evident that the relationships between normalized void volume fraction and normalized strain by each critical value corresponding to crack initiation were independent of stress-strain relationship of material and stress triaxiality state. Based on this characteristic associated with void growth, damage evolution law was derived. Then, using the damage evolution law, simple and phenomenological ductile damage model reflecting void growth behavior and ductility of material was proposed. To confirm the validation and application of proposed damage model, the damage model was implemented in finite element models and ductile crack growth resistance was simulated for cracked components were performed. Then, the simulated results were compared with experimental ones and it was found that the proposed damage model could accurately predict ductile crack growth resistance and was applicable to ductile crack growth simulation.

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