| Autor: |
Kodai TOYOTA, Yuya IMAGAWA, Takashi ONIZAWA, Shoichi KATO, Yoshiyuki FURUYA |
| Jazyk: |
japonština |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Nihon Kikai Gakkai ronbunshu, Vol 89, Iss 928, Pp 23-00206-23-00206 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2187-9761 |
| DOI: |
10.1299/transjsme.23-00206 |
| Popis: |
In order to design fast reactors, it is necessary to consider high cycle fatigue of structural materials up to 1×109 cycles. Since the fatigue usage factor (UF) is calculated down to the order of 0.01 in fast reactor design, it is necessary to develop fatigue curves applicable up to 1×1011 cycles to evaluate high cycle fatigue at 1×109 cycles. In this study, the applicability of the best-fit fatigue curve of JSME up to 1×1011 cycles was verified in order to develop a high cycle fatigue evaluation method for Mod.9Cr-1Mo steel, which is a candidate material for fast reactor structural materials. In the applicability verification, high cycle fatigue tests were first conducted at 500 °C, 550 °C, and 600 °C under strain-controlled conditions, and ultrasonic fatigue tests were conducted at 550 °C. The test results were then evaluated and showed that there was no rate dependence and no difference by product types for high cycle fatigue strength of Mod.9Cr-1Mo steel at high temperatures. It was also clarified that there was no difference in high cycle fatigue strength of Mod.9Cr-1Mo steel at high temperatures even if the failure mode changed from surface origin to internal origin. A best-fit fatigue curve was developed from test data obtained in high cycle fatigue tests up to 1×109 cycles. And based on the high cycle fatigue mechanism discussed from the ultrasonic fatigue test results, the best-fit fatigue curve of JSME was confirmed to be applicable to Mod.9Cr-1Mo steel up to 1×1011 cycles regardless of product types. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
