PSI - Issue 57

Mehdi Ghanadi et al. / Procedia Structural Integrity 57 (2024) 386–394

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Mehdi Ghanadi et al./ Structural Integrity Procedia 00 (2023) 000 – 000

Figure 1. Non-load-carrying cruciform joint: (a)3D test model,(b)2D FE model, (c) a quarter of model, (d) meshed model at the notch (weld toe) region.

5. Fatigue test data Fatigue test data for a series of non-load-carrying cruciform joints, which are manufactured from a range of plate thicknesses with different weld sizes and weld lengths, are collected from the literature ((Akihiko et al., 1994; Braun et al., 2020; Gao et al., 2015; T. R. Gurney, 1991; Gustafsson, 2006; Tong et al., 2023). Dimensions of the fatigue test specimens found in the literature are listed in Tab. 1. The data are limited to as-welded joints under constant amplitude tensile load with a low-stress ratio. Runouts are also excluded from the evaluation. Table 1. Dimensions of test specimens Case t1 [mm] t2 [mm] L [mm] W [mm] Ref. 1 13 3 13 120

(Gurney, 1991) (Gurney, 1991) (Gurney, 1991) (Gurney, 1991) (Gurney, 1991) (Gurney, 1991) (Gurney, 1991) (Gurney, 1991) (Gurney, 1991)

2 3 4 5 6 7 8 9

13 25 25 25 38 38

10

26 13 50

120 120 120 120

3

32

220

250

13

29

70 70 46 46 42 84 21 21 21 21 50 40 40 40 40 25 50

220

250

100 100

3

13

220

250 17.4 28.8 11.4 11.4 11.4 11.4 28.1

10 11 12 13 14 15 16 17 18 19 20 21 22

6

6

(Gustafsson, 2006) (Gustafsson, 2006) (Gustafsson, 2006) (Gustafsson, 2006) (Gustafsson, 2006) (Gustafsson, 2006) (Braun et al., 2020) (Tong et al., 2023) (Tong et al., 2023) (Tong et al., 2023) (Tong et al., 2023) (Gao et al., 2015)

12

12

3 3 3 3

3 3 3 3

10 10 20 10 10

10 10 20 10 10

26 36 26 26

12.7

12.7

28.7

40 (Akihiko et al., 1994) t1: Thickness of load carrying plate; t2: Thickness of stiffener; L: Attachment length; W: Weld length. 40 62

6. Results The finite element (FE) analysis is performed for each test specimen. FE results for 3,10 and 40 mm plate thicknesses are presented in Fig. 2. The maximum principal stress is at the weld toe on the loaded plate, which is the case for non-load-carrying cruciform joints. The result also shows that the maximum stress at the weld toe increases with increasing plate thickness while the stress gradient becomes less steep as the plates thicken.