2010 Fiscal Year Final Research Report
Effect of microscopic residual stress on the characteristics on fatigue crack propagation of lamellar-microstructure steel
| Project/Area Number |
21760075
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Materials/Mechanics of materials
|
|---|
| Research Institution | Osaka University |
|---|
Principal Investigator |
MIKAMI Yoshiki Osaka University, 工学研究科, 助教 (40397758)
|
|---|
| Project Period (FY) |
2009 – 2010
|
| Keywords | 層状組織鋼 / 疲労き裂進展特性 / 微視的残留応力 / ミクロ組織 / 相変態 / 変態膨張 / 強度不均質 / 数値シミュレーション |
|---|
| Research Abstract |
A numerical simulation method to calculate microscopic residual stress distribution in lamellar microstructure steel was developed. The calculated microscopic residual stress was compressive in martensite phase and tensile in ferrite phase. Fatigue crack propagation path observed in experiments is reasonable in terms of the simulated results. Crack propagation analysis method under microscopic residual stress state was also developed. It was shown that the crack propagation rate decreases when compressive residual stress exists in martensitic phase.
|
