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GIUNTI SALDATI E DK DI SOGLIA: UN NUOVO CRITERIO PER LE PREVISIONI DI RESISTENZA A FATICA
Last modified: 2008-06-15
Abstract
The paper takes into account fatigue strength data already reported by Maddox and Gurney and referred to
cruciform joints under remote tensile stresses. Nominal stress ranges at high cycle (5× 106) were largely
scattered, due to large variations of joint geometrical parameters. The scatter band reduces as soon as a
virtual short crack is introduced at the weld toe and the behaviour of the joints in given in terms of DKI. A
link is found between DKI and DKth, the latter being suggested by Radaj for welded joints made in
construction steels. Thus, high cycle fatigue strength can be assumed as a limit condition for
non-propagating cracks. Analytical expressions are given for KI in presence of a notch radius at the weld toe
equal to zero; such expressions are based on the notch stress intensity factors for opening and sliding Modes
K1 and K2.
cruciform joints under remote tensile stresses. Nominal stress ranges at high cycle (5× 106) were largely
scattered, due to large variations of joint geometrical parameters. The scatter band reduces as soon as a
virtual short crack is introduced at the weld toe and the behaviour of the joints in given in terms of DKI. A
link is found between DKI and DKth, the latter being suggested by Radaj for welded joints made in
construction steels. Thus, high cycle fatigue strength can be assumed as a limit condition for
non-propagating cracks. Analytical expressions are given for KI in presence of a notch radius at the weld toe
equal to zero; such expressions are based on the notch stress intensity factors for opening and sliding Modes
K1 and K2.
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