Numerical Study for the Effect of Shape of Additional Weld on Fatigue Strength in Out-of-Plane Gusset Welded Joint

Effects of additional weld and grinding on fatigue life extension of non-load-carrying cruciform joints

“…The fatigue performance of the joints was evaluated numerically based on the prediction of fatigue crack initiation and propagation lives, where the bead geometry, angular distortion and changes in material properties by weld heat were considered [9][10][11][12][13][14] . The FE 1.…”

“…Since fatigue life varies with the stress ratio, the original experimental equation 2,10,14,15) is improved by considering the function A(σm) as in the following equation. where A(σm) is a function proposed in this study to consider the effect of the stress ratio 13,16,18) .…”

“…Fatigue failure of weld structures is often initiated around the welded parts due to a series of factors, such as stress concentration caused by the geometry of the welding bead, changes in material properties by heat input, residual stresses and deformations. On the other hand, grinding, TIG treatment, peening, etc., are available to improve the fatigue strength of welded joints [1][2][3][4][5][6][7][8][9][10][11][12][13][14] . Some of those methods have been standardized in JSSC 3) as improving methods to enhance the fatigue performance of joints.…”

“…Some of those methods have been standardized in JSSC 3) as improving methods to enhance the fatigue performance of joints. The application of additional welding is also one of the techniques adopted for reducing the stress concentration at the weld toe, and it is relatively easy to actuate 8,10,[12][13][14] .…”

“…In this work, fatigue performances on crack initiation and propagation lives were numerically evaluated and compared with experimental results 8) to understand the influence of additional welding and grinding treatment on fatigue strength of non-loadcarrying cruciform joints. Fatigue crack initiation and propagation life are predicted based on cyclic elastoplastic FE and X-FE analyses 10,[13][14][15][16] , respectively. The bead geometry and the angular distortion of the joints used in the numerical analyses were extracted from the specimens used in the fatigue tests.…”