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Bruchmechanische Beschreibung der Wöhlerlinien geometrisch ähnlicher Schweißproben aus Aluminium

Fracture-mechanical description of the S-N-curves of geometrically similar weld specimes made of aluminium

: Lehrke, H.-P.; Brandt, U.; Sonsino, C.M.

	Schweißen und Schneiden 50 (1998), No.8, pp.492-497 : Ill., Lit. ISSN: 0036-7184

	German
	Journal Article
	Fraunhofer LBF ()
	aluminium; aluminiumlegierung; aluminum; aluminum alloy; Bruchmechanik; crack length; crack propagation; fatigue life estimation; Festigkeitsbeurteilung; fracture mechanics; Kerbe; Lebensdauerabschätzung; material characteristic; notch; Probestab; Rechenverfahren; Rißfortschritt; Rißlänge; root split; Schweißnaht; Schweißverbindung; Spannungsintensitätsfaktor; Spannungsverteilung; specimen; strength evaluation; stress distribution; stress intensity factor; theoretical method; weld; welded joint; Werkstoffkennwert; Woehler curve; Wöhlerlinie; Wurzelspalt

Abstract
A theoretical calculation of the S-N-curves based on crack propagation of geometrically similar specimens with and without incomplete joint penetration is presented. The results are compared with the experimental data from another investigation. The specimens made of the alloy AlMg4.5Mn (W28) were manufactured by metal-inert gas welding. For the fracture -mechanical calculations of the crack propagation, one model for the calculation of a fictitious initial crack is developed for the samples without incomplete joint penetration and one model for the calculation of the stress-intensity factors in the fracture cross-section is developed for the specimens with incomplete joint penetration.

: http://publica.fraunhofer.de/documents/PX-6956.html