Mixed-mode I and II fatigue threshold and crack deflection angle in SiCp/2024Al composite
- Academia Sinica, Shenyang (China). State Key Lab. for Fatigue and Fracture of Materials
In the past decade, extensive studies were made on fatigue crack propagation behavior in particle or whisker reinforced metal-matrix composites (MMCs) with specific emphasis on the pure mode I fatigue crack growth threshold condition. However, the pure mode I case seldom occurred in practice. In many components cracks are not normal to the maximum principal stress direction and the crack may not grow in the plane of initial crack. Therefore, it is important to study the fatigue behavior under mixed-mode condition. A particle reinforced metal-matrix composite and its matrix alloy were selected for this study. Special attention has been paid to the influence of crack faces friction on the mixed-mode thresholds and crack deflection angle {theta}c. The composite used in the present work is a 15% vol. SiC particulate (nominal size 14 {micro}m) reinforced 2024Al which was produced by casting and extruded at an extrusion ratio of 10:1 into 28 mm diameter rod. Also an unreinforced 2024 Al alloy with a processing history identical to that of the composite was used for comparison.
- OSTI ID:
- 230771
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 8 Vol. 34; ISSN 1359-6462; ISSN XZ503X
- Country of Publication:
- United States
- Language:
- English
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