Definition of hot spot stress in welded plate type structure for fatigue assessment (1st Report)

Experimental and numerical fatigue assessment of duplex welded transversal stiffeners

“…al. [49] proposed an extrapolation strategy for plated elements after the 1980s. Some researchers also proposed and applied through thickness linearization methods in addition to surface extrapolation techniques [32,[50][51][52].…”

A State-of-the-Art Review on Fatigue Life Assessment of Steel Bridges

“…Niemi [47] and Niemi et al [48] gave detailed recommendations concerning stress determination for the fatigue analysis of welded components and proposed distances of 0.4 and 1 times plate thickness from the weld toe and also distances of 0.5 and 1 times plate thickness for coarser meshes. Yagi et al [49] proposed a definition of hot spot stress for fatigue design of plate-type structures, and the hot spot stress should be obtained by means of the linear extrapolation of the specific two points at 1.57 4 √ 3 and 4.9 4 √ 3 to the weld toe. Nonlinear extrapolation instead of the linear extrapolation is occasionally applied by considering that the structural stress increase in front of the welded joint occurs with various gradients and nonlinearities [50].…”

Fatigue strength determination of ship structural joints

“…Certain considerations as to choice of reference points for plate elements are given in [20]. In present the selection procedure for the reference points is defined differently by various institutions, for instance [1]: • International Institute of Welding recommends the linear extrapolation of stress values from the points located in the distance of 0,4·t and t from the point of weld penetration into parent material (where t -plate thickness) [21], on the other hand Yagi [22] shows that making use of the stresses in the points located respectively in the distance of and from the fusion penetration point, gives very good conformity with experimental data.…”