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Ermittlung des Schweißeigenspannungsfeldes mittels Röntgen‐, Synchrotron‐ und Neutronenbeugungsverfahren
Author(s) -
Farajian M.,
NitschkePagel T.,
Wimpory R. C.,
Hofmann M.,
Klaus M.
Publication year - 2011
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201100782
Subject(s) - residual stress , welding , synchrotron , materials science , neutron diffraction , diffraction , residual , stress (linguistics) , metallurgy , structural engineering , optics , engineering , computer science , physics , linguistics , philosophy , algorithm
To what extent the welding residual stresses influence fatigue is still unclear and matter of debate. An important reason for this lack of clarity is that the exact determination of residual stress fields in welds is complicated which leads to conservative assumptions about these stresses in the fatigue design codes. The advances in the diffraction analysis of materials offer the opportunity for the full‐field residual strain mapping in welds albeit at the cost of time and technical complexity. In this work residual stress field determination in welded S1100QL specimens by means of the x‐ray, synchrotron and neutron diffraction techniques was undertaken. The results revealed that the maximum values of surface residual stresses are not as frequently assumed, as high as the yield strength in small scale specimens. At the weld toe which could serve as a fatigue crack initiation site, even lower residual stresses than the weld centreline could be present. The in‐depth measurements revealed that the effective part of the residual stress field which could be decisive for the fatigue failure initiation is concentrated at the surface of the weld.