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Schwingfestigkeit der keramikverstärkten Kolbengußlegierung GP-AlSi 12 CuMgNi bei erhöhten Temperaturen

Fatigue strength of fibre-reinforced squeeze cast piston alloy GP-AlSi 12 CuMgNi under elevated temperatures
 
: Backer, E.; Sonsino, C.M.

Materialwissenschaft und Werkstofftechnik 22 (1991), Nr.2, S.48-55 : Abb.,Lit.
ISSN: 0933-5137
Englisch
Zeitschriftenaufsatz
Fraunhofer LBF ()
casting alloy; ceramic; compression test; Druckversuch; faserverstärkter Werkstoff; fatigue strength; fibre reinforced material; Gußlegierung; high temperature; hohe Temperatur; Keramik; mechanical stress; mechanische Beanspruchung; Schwingfestigkeit; Spannungsdehnungskurve; stress strain curve; tension test; thermal shock; thermal stress; thermische Beanspruchung; Thermoschockversuch; Zugversuch

Abstract
On specimens made of squeeze-cast piston alloy GP-AlSi 12 CuMgNi without reinforcement and Al sub2 O sub3-fibre-reinforced, thermal fatigue was investigated. Several mechanical properties such as tensile and compressive yield strength, incremental-step-method based monotonic and cyclic stress-strain curves in the temperature range of 20 to 400 degree C were determined. Moreover, fatigue tests in the range of 5 . 10 high 4 and 2.5 . 10 high7 were carried out for various stress rations in the same temperature range on unnotched specimens and S-N-curves were designed. Haigh-diagramms show the mean stress sensitivity of the materials. Obviously the fibre reinforced material is superiour at all regarded temperatures. The considerable gain of material strength obtained by fibre-reinforcement entails even better conditions for the use of newly developed pistons under incrased thermal load.

: http://publica.fraunhofer.de/dokumente/PX-32918.html