### 抄録

In order to identify the fatigue limit for a sharp notched specimen of commercially pure titanium, rotating bending fatigue tests on smooth and notched specimens were curried out. In previous studies, it was found that the fatigue limit for a sharp notched specimen of commercially pure titanium could not be determined and it is not sure whether it fail over N=10 ^{7} cycles or not. Based on the experimental results, in the smooth specimen and notched specimen (p=1.0mm), they have fatigue limits and knee points, while the sharp notched specimen (p=0.1mm) does not. As an estimation method, the fatigue crack initiation of each specimen was then investigated. The investigation results are as follows. (1) The proportional relationship exists between the maximum stress K _{iωa} at the notch root and logarithm of the number of cycles to fatigue crack initiation N _{i}. (2) Based on the slope of the relationship between the maximum stress K _{iωa} and the number of cycles to fatigue crack initiation N _{i} at the notch root, there is no possibility that the fatigue crack in the same mechanism initiates over N=10 ^{7} cycles. Therefore, the stress amplitude that is not initiated the fatigue crack at N=10 ^{7} cycles is the fatigue limit.

元の言語 | 英語 |
---|---|

ホスト出版物のタイトル | 17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures |

ページ | 937-944 |

ページ数 | 8 |

巻 | 2 |

出版物ステータス | 出版済み - 2008 |

イベント | 17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, ECF17 - Brno, チェコ共和国 継続期間: 9 2 2008 → 9 5 2008 |

### その他

その他 | 17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, ECF17 |
---|---|

国 | チェコ共和国 |

市 | Brno |

期間 | 9/2/08 → 9/5/08 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Civil and Structural Engineering

### これを引用

*17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures*(巻 2, pp. 937-944)

**Proposal of estimation method for notched specimen fatigue limit of commercially pure titanium.** / Fujii, Takumi; Hamada, Shigeru; Noguchi, Hiroshi.

研究成果: 著書/レポートタイプへの貢献 › 会議での発言

*17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures.*巻. 2, pp. 937-944, 17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, ECF17, Brno, チェコ共和国, 9/2/08.

}

TY - GEN

T1 - Proposal of estimation method for notched specimen fatigue limit of commercially pure titanium

AU - Fujii, Takumi

AU - Hamada, Shigeru

AU - Noguchi, Hiroshi

PY - 2008

Y1 - 2008

N2 - In order to identify the fatigue limit for a sharp notched specimen of commercially pure titanium, rotating bending fatigue tests on smooth and notched specimens were curried out. In previous studies, it was found that the fatigue limit for a sharp notched specimen of commercially pure titanium could not be determined and it is not sure whether it fail over N=10 7 cycles or not. Based on the experimental results, in the smooth specimen and notched specimen (p=1.0mm), they have fatigue limits and knee points, while the sharp notched specimen (p=0.1mm) does not. As an estimation method, the fatigue crack initiation of each specimen was then investigated. The investigation results are as follows. (1) The proportional relationship exists between the maximum stress K iωa at the notch root and logarithm of the number of cycles to fatigue crack initiation N i. (2) Based on the slope of the relationship between the maximum stress K iωa and the number of cycles to fatigue crack initiation N i at the notch root, there is no possibility that the fatigue crack in the same mechanism initiates over N=10 7 cycles. Therefore, the stress amplitude that is not initiated the fatigue crack at N=10 7 cycles is the fatigue limit.

AB - In order to identify the fatigue limit for a sharp notched specimen of commercially pure titanium, rotating bending fatigue tests on smooth and notched specimens were curried out. In previous studies, it was found that the fatigue limit for a sharp notched specimen of commercially pure titanium could not be determined and it is not sure whether it fail over N=10 7 cycles or not. Based on the experimental results, in the smooth specimen and notched specimen (p=1.0mm), they have fatigue limits and knee points, while the sharp notched specimen (p=0.1mm) does not. As an estimation method, the fatigue crack initiation of each specimen was then investigated. The investigation results are as follows. (1) The proportional relationship exists between the maximum stress K iωa at the notch root and logarithm of the number of cycles to fatigue crack initiation N i. (2) Based on the slope of the relationship between the maximum stress K iωa and the number of cycles to fatigue crack initiation N i at the notch root, there is no possibility that the fatigue crack in the same mechanism initiates over N=10 7 cycles. Therefore, the stress amplitude that is not initiated the fatigue crack at N=10 7 cycles is the fatigue limit.

UR - http://www.scopus.com/inward/record.url?scp=84866104563&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84866104563&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84866104563

SN - 9781617823190

VL - 2

SP - 937

EP - 944

BT - 17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures

ER -