PSI - Issue 18

Fokion Oikonomidis et al. / Procedia Structural Integrity 18 (2019) 142–162 Dr Fokion Oikonomidis / Structural Integrity Procedia 00 (2019) 000 – 000

155

14

The step loads and the durations of application are given in Table 1. The LVDT extensometer output for the duration of the test is given in Fig. 18. During the 3 rd step load (8109kN) the extensometer recorded a gradual increase in the displacement between the loading pins of the chain link by about 0.02mm, over a period of about 850 hours (see Fig. 19). This was an indication of possible crack extension under constant load.

Table 1. Step load details applied during the full-scale chain link test. Load (kN) Duration (days) Estimated K with residual stress effect (N/mm 1.5 )

Actual K after crack tip measurement (N/mm 1.5 )

Comment

500

4

-619 1881 2857 3428 7227

- -

Preliminary load

5200 7035 8109

15 28 55 14

1st step load 2nd step load 3rd step load 4th step load

2735 3319 6955

15250

Fig. 18. Extensometer output of the displacement between the loading pins of the test rig.