Abstract
Fatigue strength optimization of cast aluminium alloys requires an understanding of the role of micropores resulting from the casting process. High cycle fatigue tests conducted on cast A356-T6 show that the pore size and proximity to the specimen surface significantly influence fatigue crack initiation. This is supported by finite element analyses (both elastic and elastic-plastic) which demonstrate that high stress/strain concentration is induced by pores which are both large and near to the specimen surface. A new pore-sensitive model based on a modified stress-life approach has been developed which correlates fatigue life with the size of the failure-dominant pore. The model prediction is in good agreement with experimental data.
Original language | English |
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Title of host publication | Fatigue and Fracture of Engineering Materials and Structures|Fatigue Fract Eng Mater Struct |
Pages | 559-570 |
Number of pages | 11 |
Volume | 27 |
DOIs | |
Publication status | Published - Jul 2004 |
Keywords
- Cast aluminium alloy
- Casting porosity
- Fatigue life prediction
- Finite element analysis
- Stress/strain concentration