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Schwingfestigkeit von geschweißten Komponenten unter komplexen elasto-plastischen, mehrachsigen Verformungen

Gebrauchseigenschaften und Betriebsverhalten. Abschlußbericht, Forschungsvertrag Nr. 7210-KD/120

Fatigue strength of welded structures unter complex elasto-plastic multiaxial deformation

	Luxembourg: Europäische Kommission, 1997, 316 pp. Reportnr.: EGKS EUR 16024 DE (1997) ISBN: 92-828-1009-7

	German
	Research Report
	Fraunhofer LBF ()
	Apparatebau; Bauteil; bending; Biegung; deformation; elastic plastic behaviour; elastisch-plastisches Verhalten; equipment construction; fatigue life estimation; fatigue strength; Fertigung; Festigkeitsbeurteilung; Festigkeitshypothese; Gefüge; Lebensdauerabschätzung; local stress; machine building; manufacturing process; Maschinenbau; material property; material selection; mehrachsige Beanspruchung; microstructure; multiaxial loading; örtliche Spannung; Probestab; Rechenverfahren; reduced stress; Rohrverbindung; Schiffbau; Schweißverbindung; Schwingfestigkeit; ship building; specimen; Stahlbau; steel construction; strength evaluation; strength hypothesis; structural component; test; theoretical method; torsion; tube joint; Verformung; Vergleichsspannung; Versuch; welded joint; Werkstoffauswahl; Werkstoffeigenschaft

Abstract
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 behaviour because of uncontrolled local deformations. Thus, the influence of multiaxial stress/strain states on the fatigue behaviour 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.

: http://publica.fraunhofer.de/documents/PX-56263.html