Fatigue strength investigations of welded details of stiffened plate structures in steel ships

An extrapolation method to determine the effective notch stress in circular hollow section X‐joints

“…Pioneering and more recent investigations have provided experimental evidence that the scatter produced in the ENS versus fatigue life diagram is sufficiently low to be fitted using a single curve. Other experimentalists have also confirmed the conservativeness of the ENS design curve (FAT 225) in various industrial sectors. In addition, recent research efforts have extended successfully the ENS concept to application on thin welded joints with pronounced weld ends, which have not been addressed properly by other fatigue concepts.…”

Fatigue predictions of welded joints and the effective notch stress concept

“…The local maximum stress can then be calculated for all critical weld locations in a structure by FE analysis. This new concept has been extensively explored by Sonsino and co-authors [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. It is important to recognize that the geometry of the welded structure with effective notches has a similar character as a structure with the classical notches discussed in Section 2.…”

“…But if compared to the older assessments of welded joints in the codes of the International Institute of Welding [3], it may well turn out to be a more rational technique. In the first decade of the present century the new concept of the effective notch stress has been investigated in various pioneering research programs of Sonsino and his associates [4][5][6][7][8][9][10][11][12][13][14][15][16]. An important question was to select a suitable magnitude for the radius q of the notch.…”

Temperature‐dependent characteristics of DH36 steel fatigue crack propagation

“…1 Once microcracks occur in these structures, they will continue to expand until the structures fail under alternating loads. These structures experience millions of load cycles in service and are also exposed to harsh marine environments that may result in fatigue failures.…”

“…These structures experience millions of load cycles in service and are also exposed to harsh marine environments that may result in fatigue failures. 1 Once microcracks occur in these structures, they will continue to expand until the structures fail under alternating loads. 2 Therefore, microcracks have become a serious concern as they pose a great threat to the safety of such structures in polar regions.…”