| Autor: |
ZHOU Song, WANG Lei, MA Chuang, YANG Lin-qing, XU Liang, HUI Li |
| Jazyk: |
čínština |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
Cailiao gongcheng, Vol 44, Iss 6, Pp 98-103 (2016) |
| Druh dokumentu: |
article |
| ISSN: |
1001-4381 |
| DOI: |
10.11868/j.issn.1001-4381.2016.06.015 |
| Popis: |
Fatigue fracture often occurs because of the corrosion damage to aerospace structural aluminum alloy with holes. Fatigue tests of 7075 aluminum alloy of both unchamfered and chamfered double-hole specimens under uncorrosion and 24h pre-corrosion were carried out. The influence of both pre-corrosion damage and orifice chamferer on fatigue properties and the differences of fatigue fracture characteristics were analyzed. The results show that the effect on fatigue life of pre-corrosion damage is significant. Median fatigue lives of both unchamfered and chamfered double-hole specimens under 24h pre-corrosion decrease about 31.74% and 26.92% compared with uncorrosion specimens. The orifice chamferer have a certain effect on fatigue life of both uncorrosion and 24h pre-corrosion specimens, with median fatigue lives decreased about 28.02% and 15.36% compared with unchamfered specimens, the main reason is due to the stress concentration after orifice chamfered, on the other hand, cutting marks lead to pre-damage during the orifice chamfering process which will result in an increase of the fatigue crack initiation sites and the fracture probability. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
