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Theoretical fatigue–effective notch stresses at spot welds
Author(s) -
Radaj D.,
Lehrke H.P.,
Greuling S.
Publication year - 2001
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1046/j.1460-2695.2001.00378.x
Subject(s) - keyhole , materials science , structural engineering , welding , enhanced data rates for gsm evolution , stress (linguistics) , shear (geology) , finite element method , stress intensity factor , stress concentration , composite material , engineering , telecommunications , linguistics , philosophy
Notch stress formulae are derived for the application of a notch stress approach to the fatigue assessment of spot welds. A keyhole notch is assumed to describe the edge of the weld spot between the overlapping plates. The stress fields at the keyhole notch under ‘singular’ and ‘non‐singular’ in‐plane loading modes inclusive of the stress concentration factors K t are derived from the relevant Airy stress functions. The formulae are applied to typical loading cases of spot welds and compared with finite element solutions. Fatigue‐effective notch stresses inclusive of fatigue notch factors K f are calculated by applying the microstructural support hypothesis of Neuber. The notch stresses at the keyhole are also derived for out‐of‐plane shear loading based on the relevant harmonic stress functions. The multiaxial notch stresses at the weld spot edge are thus completely described.