Currently the fatigue design procedure for forged steel connectors in steel catenary risers (SCRs) is based on the BS 7608 Class B S-N curve. However, there is very little direct support for this. Therefore, a fatigue testing programme, including strip specimens and small-scale cylindrical machined specimens extracted from actual forged J-lay connectors, was carried out to establish a suitable Composition Design and Fatigue Curves of Hardfacing In order to evaluate the fatigue life of new designed hardfacing materials (0.5% C, 3.0% Cr, and 2.0% Nb), a series of curves at high temperature were calculated compared to 9Cr2Mo. Figure 6 gives the curves of alloy 9Cr2Mo and the optimum new alloy in different load frequency at 400°C.
In order to evaluate the fatigue life of new designed hardfacing materials (0.5% C, 3.0% Cr, and 2.0% Nb), a series of curves at high temperature were calculated compared to 9Cr2Mo. Figure 6 gives the curves of alloy 9Cr2Mo and the optimum new alloy in different load frequency at 400°C. Department of Civil Engineering - Faculty of Engineering Chaminda S. Bandara, Sudath C. Siriwardane, Udaya I. Dissanayake and Ranjith Dissanayake (2016), Full range S-N curves for fatigue life evaluation of steels using hardness measurements, International Journal of Fatigue, Vol. 82, pp. 325-331. Fatigue Assessment for Welded Aluminium Structures - TWIFor an S-N curve of the form S m N=A, the extrapolated curve would be of the form S m+2 N=A, (see Fig.5(c)). However, on the basis of fatigue tests on large-scale welded beams (to be discussed later), the Aluminum Association  take the view that the S-N curve should be extrapolated indefinitely below the constant amplitude fatigue limit
A full range of stress intensity factor solutions for a kinked crack is developed as a function of weld width and the sheet thickness. When used with the associated main crack solutions (global stress intensity factors) in terms of the applied load and specimen geometry, the fatigue lives can be estimated for the laser-welded lap-shear specimens. Full-Range S-N Fatigue-Life Evaluation Method for Welded Full-Range S-N Fatigue-Life Evaluation Method for Welded Bridge Structures Considering Hot-Spot and Welding Residual Stress August 2016 Journal of Bridge Engineering 21(12):04016096 Hardness-Based Non-destructive Method for Developing regions while strain-life (-N) curves are used in the LCF (low cycle fatigue) region [1, 2]. Civil engineering structures are generally subjected to HCF during service loading. Therefore, S-N curves are usually employed for fatigue damage estimations. EN 1993-1-9:2005  and AASHTO LRFD:2012  are well-known codes for S-N curve based on damage evaluations of steel bridges. S-N curves given
predicts the fatigue life accurately, its requirement for a full-range S-N curve restricts industrial application by practicing engineers. Also, the design codes given S-N curves are based on detail categories, and the physical meaning of the intercept used for such details is not clear. Moreover, this International Journal of Fatigue 10th Fatigue Damage of Full range SN curves for fatigue life evaluation of steels using hardness measurements Chaminda S. Bandara, Sudath C. Siriwardane, Udaya I. Dissanayake, Ranjith Dissanayake Pages 325-331 J. Compos. Sci. Free Full-Text S-N Curve Models for S-N behavior has been a backbone of material fatigue life studies since the 19th century. Numerous S-N curve models have been produced but they have been arbitrarily chosen in numerous research works dominantly for composite materials. In this paper, they were critically reviewed and evaluated for capability using the following criteria:data fitting capability, efficiency of curve fitting
It is common practice to reduce stress by a factor of 2 or number of cycles by a factor of 20, whichever is more conservative when generating the S-N curves for design purposes. Reduction factors used for S-N curves cover scatter in the data, environmental effects, and size effects. A number of conditions affect fatigue life of a pressure vessel. SN curves for fatigue life estimation of friction stir Nov 10, 2020 · SN curves for fatigue life estimation of friction stir welded 19501 aluminum alloy T-joint Full range SN curves for fatigue life evaluation of steels using hardness measurements Strain Energy-Based Fatigue Life Evaluation of Deck-to-Rib Full-Range S-N Fatigue-Life Evaluation Method for Welded Bridge Structures Considering Hot-Spot and Welding Residual Stress Journal of Bridge Engineering August 2016 Fatigue Damage Evaluation of Orthotropic Steel Deck Considering Weld Residual Stress
S-N curve analysis including multiaxial fatigue using axial stress or a new Brown-Miller analysis formulated for use with S-N curves Dang Van multiaxial fatigue for high cycle design Plots of material data including the effect of temperature,strain rate etc. J. Compos. Sci. Free Full-Text S-N Curve Models for An S-N curve is essential not only for characterizing fatigue test results from un-notched specimens but also for the remaining fatigue life predictions involving fatigue damage quantification and stress ratio effect. Thus, the S-N curve behavior has been a backbone of fatigue life studies