抄録
In order to investigate crack propagation behavior of thermal fatigue on the basis of non-linear fracture mechanics, crack propagation tests were conducted for isothermal fatigue at several temperatures and for cyclic temperature fatigue. The results obtained were summarized as follows. (1) The fracture mechanics laws in isothermal fatigue dl/dN-ΔJf and dl/dN-ΔJc relations where dl/dN was crack propagation rate. ΔJf was fatigue J-integral range and ΔJc was creep J-integral range) showed little dependence on temperature. (2) A simple evaluation method of the values of ΔJf and ΔJc in thermal fatigue was proposed. (3) Crack propagation under cyclic temperature could be divided into two types which were cycle-dependent and time-dependent. dl/dN had good correlations with ΔJf and ΔJc for each type, respectively. (4) The transient condition between two types was given by a function of ΔJf and ΔJc. (5) The same fracture mechanics laws were obtained in isothermal and cyclic temperature fatigue.
| 本文言語 | English |
|---|---|
| ページ（範囲） | 1030-1036 |
| ページ数 | 7 |
| ジャーナル | Transactions of the Japan Society of Mechanical Engineers Series A |
| 巻 | 53 |
| 号 | 490 |
| DOI | |
| 出版ステータス | Published - 1987 |
| 外部発表 | はい |
ASJC Scopus subject areas
- 材料科学（全般）
- 材料力学
- 機械工学