PSI - Issue 2_B

Xuesong Liu et al. / Procedia Structural Integrity 2 (2016) 2038–2045 Author name / Structural Integrity Procedia 00 (2016) 000–000

2044

7

transition in thickness of 1:4 is applied to this model. The thickness range of t and T is 12-20mm, 25-34mm, respectively. Nine groups are combined from different thickness plates. Fig6(a) shows the SCFs of different thickness plates combination. The SCF curves of plates combination tends to decrease with the increasing of plates thickness. Fig.6(b) demonstrates comparison results of predicted SCF and analytical SCF from different thickness combinations. As a nominal stress 100Mpa is loaded, the predicted stress concentration values of transition zone have a good agreement compared with analytical results for the nine combinations.

2.2

2.6

(a)

(b)

t=12,T=25 t=15,T=28 t=18,T=32 t=20,T=34

CH1 Model (Eq.3)

2.4

2.0

2.2

2.0

1.8

1.8

SCF

1.6

1.6

Predicted SCF

t = 12-20 mm T = 25-34 mm

1.4

1.4

1.2

t=12,T=25 t=15,T=28 t=18,T=32 t=20,T=34

1.2

1.0

1.2

1.4

1.6

1.8

2.0

2.2

Positon along weld measured from longitudinal (mm) 0 200 400 600 800 1000

Analysis SCF

Fig.6 (a) SCFs of different thickness plates combination, (b) Comparison of predicted SCF and analytical SCF from different thickness combinations . 3.6. Slope effect of transition zone between the different thickness To examine the effect of slope, different slope models were analyzed and compared with calculated results. At the same time, two different thickness plates are chosen to figure out the SCF, which is 20mm and 15mm. these results show slope effect in misalignment transition zone in Fig. 7. The SCFs are gradually decreasing with the slope ratio increasing.

1.5

Slope effect

1.4

1.3

1.2

SCF

1.1

1.0

2

3

4

5

6

7

Slope ratio

Fig.7 Slope effect of SCF in transition zones