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Papakyriacou, M., Mayer, H..
(2006): Erm├╝dungsverhalten und Dauerfestigkeit von Graphit und Aluminium - infiltriertem Graphit
Materialwiss. Werkstofftech., 37, 3, 264-271 FullText FullText_BOKU

Fatigue properties of polycrystalline, isotropic graphite FU2590 and of FU2590 infiltrated with AlSi7Mg (FU2590/AlSi7Mg) were investigated in reversed bending tests at 25 Hz at numbers of cycles below 10(7) and in tension-compression tests at 20 kHz below 10(9) cycles. The open porosity of Graphite (10-11 Vol.-%) was infiltrated with the aluminium alloy using the squeeze casting infiltration method, which led to an increase of the bending strength by 50 %, increase of tensile strength by 30 % and increase of stiffness by 15 %. Fully reversed tension-compression loading of FU2590 delivers 0 cycles at the normalized maximum a mean endurance limit at 10(9) stresses (i.e. maximum tension stress of a cycle divided by the static strength) of 0,65 +/- 0,03. Mean numbers of cycles to failure of 10(4) were found in fully reversed bending tests at the normalized maximum stress of 0,78. The infiltrated material shows approximately 30 % higher cyclic strength in reversed bending tests, and the mean endurance limit under tension compression loading increases by 15 %. The increased endurance limit of the infiltrated material is caused by the increased stiffness. The increased toughness of graphite due to the infiltration with aluminium is of additional beneficial influence at the higher cyclic stresses investigated in reversed bending tests and in static tests.
Authors BOKU Wien:
Mayer Herwig

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