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Einfluß von last- und verformungsggesteuerten mehrachsigen Beanspruchungen auf die Anrißlebensdauer

Influence of load- and deformation-controlled multiaxial test on fatigue life to crack initiation
: Sonsino, C.M.


Materialwissenschaft und Werkstofftechnik 26 (1995), No.8, pp.425-441 : Abb.,Tab.,Lit.
ISSN: 0933-5137
Journal Article
Fraunhofer LBF ()
Anrißlebensdauer; Bauteil; Beanspruchung; crack initiation fatigue life; creep; deformation; elastic-plastic behaviour; elastisch-plastisches Verhalten; Kriechen; Last; Lebensdauerabschätzung; load; loading; mehrachsige Beanspruchung; multiaxial loading; Spannungsdehnungsverhalten; stress strain behavior; structural component; Verformung

Generally, areas of components with notches or geometrical transitions are critical because of the resulting stress/strain concentrations. In these areas due to the stress-gradients and constraint local deformations are displacement controlled even if the material's yield stress is exceeded, as long as the deformations are below the structural yield point. Therefore, load controlled tests in the elasto-plastic region with unnotched specimens from ductile materials under combined axial loading and torsion are not suitable for the interpretation of component's behavior because of uncontrolled local deformations. Thus, the influence of multiaxial stress strain states on the fatigue behavior of a component under elasto-plastic deformations can be determined reliably with unnotched specimens only by deformation controlled tests, if cyclic creep is not expected in critical areas.