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Werkstoffauswahl für schlagartig und zyklisch belastete metallische Bauteile

Material selection for impact and fatigue loading
: Sonsino, C.M.


Materialwissenschaft und Werkstofftechnik 32 (2001), No.3, pp.221-230
ISSN: 0933-5137
Journal Article
Fraunhofer LBF ()
Schlagbeanspruchung; Betriebsfestigkeit; Bauteil; Werkstoff; Kerbe; Verformung; Festigkeit; Schwingfestigkeit; Druckeigenspannung; Spannungskonzentration; Geometrie; Lebensdauer

The structural durability of components is dominated mainly by the geometry, i.e. notches. Compared with the impact resistance of forged components from ductile materials high impact values can be realized by an appropriate shaping also using less ductile cast materials. Creep deformations can be suppressed in presence of notches. The strength level of the base material remains for stress concentrations above K-t = 2.5 and for the welded state without influence on the fatigue behaviour. If sharp notches cannot be avoided by a new design, benefits from high-strength materials can be taken only in connection with surface treatments which introduce high compressive residual stresses. Principally, advantages from high-strength materials can be gained for unwelded components only by reduction of the stress-concentration and in case of welded joints by smoothening or removal of the weld notches and in case of spot welds by transfer-ring of the failure location outside of the nugget.