書誌事項
- タイトル別名
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- Crack Growth Behavior of Al Alloy 7075-T6 under Ultrasonic Fatigue
- Al ゴウキン 7075 T6 ノ チョウオンパ ヒロウ ニ オケル キレツデンパキョドウ
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抄録
In order to investigate the effect of frequency on the crack growth behavior, ultrasonic fatigue tests were carried out for an extruded age-hardened Al alloy, 7075-T 6, in ambient air and in N2 gas, and the results were compared with those in rotating bending fatigue. Fatigue strength was higher in ultrasonic fatigue than in rotating bending one. This was caused by the retardation of a crack initiation and its early propagation. In ultrasonic fatigue, the growth direction of a crack changed macroscopically from a tensile mode to a shear one which the direction was about 35 degrees against to the specimen axis, and fracture mechanism also changed from striations to transgranular facets with voids microscopically. Crack growth rate at the transition of crack growth direction was about 3 × 10-9 m/cycle. The relation between an applied stress σa and a crack depth at the transition of crack growth direction bT was expressed by σnabT=constant. These results were explained from the time dependent environmental effect and texture of microstructure.
収録刊行物
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- 日本機械学会論文集A編
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日本機械学会論文集A編 72 (721), 1356-1363, 2006
一般社団法人 日本機械学会
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詳細情報 詳細情報について
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- CRID
- 1390001204477033216
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- NII論文ID
- 110004811003
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- NII書誌ID
- AN0018742X
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- COI
- 1:CAS:528:DC%2BD28Xht1GqtLbP
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- ISSN
- 18848338
- 03875008
- http://id.crossref.org/issn/03875008
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- NDL書誌ID
- 8520639
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可