2010 Fiscal Year Final Research Report
Development of fatigue crack healing in metals by controlling high-density electric current field and its evaluation
| Project/Area Number |
21760072
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Materials/Mechanics of materials
|
|---|
| Research Institution | Nagoya University |
|---|
Principal Investigator |
HOSOI Atsushi Nagoya University, 大学院・工学研究科, 助教 (60424800)
|
|---|
| Project Period (FY) |
2009 – 2010
|
| Keywords | 疲労 / き裂進展 / き裂修復 |
|---|
| Research Abstract |
A technique was developed to heal a fatigue crack in stainless steel by controlling a high-density electric current field. From the experimental results, it was observed that the crack closure and the bridging between the surfaces of a crack were caused around the vicinity of the crack tip after high density pulse current was applied to a specimen. It was shown that crack propagation was delayed temporarily in the healed specimen. Moreover, by removing oxide membrane and coating the metal protection film for preventing re-oxidation on the crack surfaces, the crack closure and the bridging were promoted, and the branched small crack was healed completely by application of current.
|
