Abstract
For this study we used finite element analysis to show how the residual stress affects the hydrogen concentration around a crack tip in a plastically deformable material after a fatigue process. Following a 9. cycle fatigue process, hydrogen diffusion analysis was carried out at the highest applied fatigue stress. This showed hydrogen invading the crack surface and diffusing into the material. The concentration of hydrogen was higher close to the crack tip and its behavior was largely affected by the residual stress in the material. Tensile residual stress accelerated the hydrogen invasion and increased its concentration, while compressive residual stress simulated as the stress induced by peening clearly suppressed them. This is due to the affect the residual stress has on the hydrostatic stress around the crack tip which is a dominant factor in the hydrogen diffusion behavior. Peening, which is a surface treatment used to introduce compressive residual stress to enhance the mechanical properties of a material, such as its resistance to stress corrosion cracking and its fatigue strength, may, therefore, suppress the embrittlement caused by hydrogen.
| Original language | English |
|---|---|
| Pages (from-to) | 2892-2898 |
| Number of pages | 7 |
| Journal | Surface and Coatings Technology |
| Volume | 206 |
| Issue number | 11-12 |
| DOIs | |
| Publication status | Published - Feb 15 2012 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry
Cite this
Numerical simulation of the effects of residual stress on the concentration of hydrogen around a crack tip. / Takakuwa, Osamu; Nishikawa, M.; Soyama, H.
In: Surface and Coatings Technology, Vol. 206, No. 11-12, 15.02.2012, p. 2892-2898.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Numerical simulation of the effects of residual stress on the concentration of hydrogen around a crack tip
AU - Takakuwa, Osamu
AU - Nishikawa, M.
AU - Soyama, H.
PY - 2012/2/15
Y1 - 2012/2/15
N2 - For this study we used finite element analysis to show how the residual stress affects the hydrogen concentration around a crack tip in a plastically deformable material after a fatigue process. Following a 9. cycle fatigue process, hydrogen diffusion analysis was carried out at the highest applied fatigue stress. This showed hydrogen invading the crack surface and diffusing into the material. The concentration of hydrogen was higher close to the crack tip and its behavior was largely affected by the residual stress in the material. Tensile residual stress accelerated the hydrogen invasion and increased its concentration, while compressive residual stress simulated as the stress induced by peening clearly suppressed them. This is due to the affect the residual stress has on the hydrostatic stress around the crack tip which is a dominant factor in the hydrogen diffusion behavior. Peening, which is a surface treatment used to introduce compressive residual stress to enhance the mechanical properties of a material, such as its resistance to stress corrosion cracking and its fatigue strength, may, therefore, suppress the embrittlement caused by hydrogen.
AB - For this study we used finite element analysis to show how the residual stress affects the hydrogen concentration around a crack tip in a plastically deformable material after a fatigue process. Following a 9. cycle fatigue process, hydrogen diffusion analysis was carried out at the highest applied fatigue stress. This showed hydrogen invading the crack surface and diffusing into the material. The concentration of hydrogen was higher close to the crack tip and its behavior was largely affected by the residual stress in the material. Tensile residual stress accelerated the hydrogen invasion and increased its concentration, while compressive residual stress simulated as the stress induced by peening clearly suppressed them. This is due to the affect the residual stress has on the hydrostatic stress around the crack tip which is a dominant factor in the hydrogen diffusion behavior. Peening, which is a surface treatment used to introduce compressive residual stress to enhance the mechanical properties of a material, such as its resistance to stress corrosion cracking and its fatigue strength, may, therefore, suppress the embrittlement caused by hydrogen.
UR - http://www.scopus.com/inward/record.url?scp=84856483222&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84856483222&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2011.12.018
DO - 10.1016/j.surfcoat.2011.12.018
M3 - Article
AN - SCOPUS:84856483222
VL - 206
SP - 2892
EP - 2898
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
SN - 0257-8972
IS - 11-12
ER -