Abstract
In this study the combined axial–torsional fatigue life and damage evolution of both coarse-grained (CG) and nanostructured metals are modeled by a 3D cohesive finite element method with uncertainty characteristics. To account for the random nature of metal fatigue, we combine the Monte Carlo simulation with the three-parameter Weibull statistical distribution function. For both CG and nanostructured metals, we find that the axial load levels have greater effects than random fields on the amplitude of specimen rotation. Compared with the CG metals, the nanostructured metals are found to exhibit an improved fatigue resistance, for the reason that their damage process initiates from the subsurface beneath the nanograined layer and then extends to the exterior surface. Good agreements between the numerical results and experimental data are also observed. It shows the applicability of the 3D cohesive finite element method for the analysis of damage evolution and prediction of fatigue life in these two classes of metals.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 30-43 |
| Number of pages | 14 |
| Journal | Engineering Fracture Mechanics |
| Volume | 195 |
| DOIs | |
| State | Published - May 15 2018 |
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All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Materials Science(all)
Keywords
- Cohesive element
- Damage evolution
- Fatigue life
- Nanograined layer
- Scatter of fatigue results
Cite this
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Axial-torsional high-cycle fatigue of both coarse-grained and nanostructured metals : A 3D cohesive finite element model with uncertainty characteristics. / Sun, Q. Q.; Guo, X.; Weng, G. J.; Chen, G.; Yang, T.
In: Engineering Fracture Mechanics, Vol. 195, 15.05.2018, p. 30-43.Research output: Contribution to journal › Article
TY - JOUR
T1 - Axial-torsional high-cycle fatigue of both coarse-grained and nanostructured metals
T2 - A 3D cohesive finite element model with uncertainty characteristics
AU - Sun, Q. Q.
AU - Guo, X.
AU - Weng, G. J.
AU - Chen, G.
AU - Yang, T.
PY - 2018/5/15
Y1 - 2018/5/15
N2 - In this study the combined axial–torsional fatigue life and damage evolution of both coarse-grained (CG) and nanostructured metals are modeled by a 3D cohesive finite element method with uncertainty characteristics. To account for the random nature of metal fatigue, we combine the Monte Carlo simulation with the three-parameter Weibull statistical distribution function. For both CG and nanostructured metals, we find that the axial load levels have greater effects than random fields on the amplitude of specimen rotation. Compared with the CG metals, the nanostructured metals are found to exhibit an improved fatigue resistance, for the reason that their damage process initiates from the subsurface beneath the nanograined layer and then extends to the exterior surface. Good agreements between the numerical results and experimental data are also observed. It shows the applicability of the 3D cohesive finite element method for the analysis of damage evolution and prediction of fatigue life in these two classes of metals.
AB - In this study the combined axial–torsional fatigue life and damage evolution of both coarse-grained (CG) and nanostructured metals are modeled by a 3D cohesive finite element method with uncertainty characteristics. To account for the random nature of metal fatigue, we combine the Monte Carlo simulation with the three-parameter Weibull statistical distribution function. For both CG and nanostructured metals, we find that the axial load levels have greater effects than random fields on the amplitude of specimen rotation. Compared with the CG metals, the nanostructured metals are found to exhibit an improved fatigue resistance, for the reason that their damage process initiates from the subsurface beneath the nanograined layer and then extends to the exterior surface. Good agreements between the numerical results and experimental data are also observed. It shows the applicability of the 3D cohesive finite element method for the analysis of damage evolution and prediction of fatigue life in these two classes of metals.
KW - Cohesive element
KW - Damage evolution
KW - Fatigue life
KW - Nanograined layer
KW - Scatter of fatigue results
UR - http://www.scopus.com/inward/record.url?scp=85044967583&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85044967583&partnerID=8YFLogxK
U2 - https://doi.org/10.1016/j.engfracmech.2018.03.025
DO - https://doi.org/10.1016/j.engfracmech.2018.03.025
M3 - Article
VL - 195
SP - 30
EP - 43
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
SN - 0013-7944
ER -