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1999
Conference Paper
Title
Theoretische und experimentelle Untersuchungen für eine Bemessung und serienreife Entwicklung von Ein- und Auslassventilen aus Siliziumnitrid
Other Title
Theoretical and experimental investigation for an assessment and mass-production of intake and exhaust valves from silicon nitride
Abstract
A concept for the fatigue assessment of intake and exhaust valves from silicon nitride was developed. The concept includes the definition of operational stresses on the valves and the determination of the fatigue strength. The loading conditions temperature (stationary and instationary), valve opening, combustion pressure and valve closing were studied. For these loading conditions, the operational stresses at different points of the valve were calculated by finite element method. The fatigue strength of the ceramic valves were examined by experimental fatigue tests. Additional to the fatigue tests, Adam Opel AG investigated ceramic intake and exhaust valves by motor tests. To proving the behaviour of ceramic valves under traffic conditions, driving tests were carried out by five Mercedes Benz Cars.
Author(s)
Conference
Language
German
Keyword(s)
Beanspruchung
Bemessung
Betriebsbeanspruchung
ceramics
design nitride
finite element method (FEM)
Finite-Elemente-Methode (FEM)
Haigh diagram
Haigh-Schaubild
keramischer Werkstoff
loading
material property
mehrachsige Beanspruchung
multiaxial loading
Oberflächenbehandlung
operational loading
remaining life
Restlebensdauer
rotating bending
silicon
Siliziumnitrid
surface treatment
Umlaufbiegung
valve
Ventil
Werkstoffeigenschaft
Woehler curve
Wöhlerlinie