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By R. C. Ellwanger, S. Q. Wang
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Additional info for Advanced Metallization and Interconnect Systems for Ulsi Applications in 1995
The S–N curves of the structural details are limited from above by the S–N curve of the parent material. The inverse slope k is identical for steels and aluminium alloys. 13,15 The detail classifications of some typical welded joints supplement the diagrams above. Comparable S–N curves from the ECCS design recommendations which are basic for the Eurocode 3 and Eurocode 9, respectively, are shown in Fig. 6 and Fig. 7. The technical endurance limit for constant-amplitude loading is assumed at the first knee point (N = 5 × 106 cycles), whereas the S–N curves for variableamplitude loading (effective S–N curves) used in the calculation of damage accumulation are elongated with further dropping into the high-cycle range (inverse slope k′ ≈ 2k − 1).
1. 5 a Cruciform or lap joint with transverse fillet weld. Discontinuous web-to-flange fillet weld. c Lap joint with side fillet welds. d Transverse attachment. e Longitudinal attachment. b The fatigue limit sE or tE of the parent material is usually determined by testing polished specimens (such reference values are used in Fig. g. 1). A dash is positioned on top of the symbol g in the latter case. Also R = −1 may be considered instead of R = 0. Supposing that the fatigue strength of welded joints is independent of the static tensile strength of the material (structural steel or aluminium alloy) – which is a realistic assumption with regard to severely notched welded joints with correspondingly low reduction factors – lower reduction factors are derived for high strength materials.
The structural stress at the hot spot is supposed to make strength-characteristic values transferable from the specimen to the tubular joint even in cases of slight differences in local geometry and loading mode. This can be expressed in such a way that the fatigue strength of the welded joint specimen in terms of nominal stress presents the limit value of the structural stress at the hot spot in the tubular joint. Nominal and structural stresses are considered to be equivalent in respect of a definite notch or detail class S–N curve.
Advanced Metallization and Interconnect Systems for Ulsi Applications in 1995 by R. C. Ellwanger, S. Q. Wang