PSI - Issue 2_A

Simon Sedmak et al. / Procedia Structural Integrity 2 (2016) 3546–3553 Author name / Structural Integrity Procedia 00 (2016) 000–000

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3.2. Results without RS (FL-UNL, SL-UNL). Figure 7 illustrates the behavior of von Misses stress-strain curve of weld joint (LS1) for FL-UN and second load-unload, this behavior showed the linearity of stress-strain curve of loading and unloading behavior for first and second load. Figure 8 shows the behavior of von Misses stresses with loading and unloading, as the pressure increasing the von Misses stresses increasing until the yield point of the weld joint, then the changing of Von Misses stresses will be lower, for unloading the behavior will be linear, until the effect of residual stresses then will be non-linear.

Fig. 7. Von Misses stress-strain behaviour LS1 SAW without RS as calculated in ABAQUS. Fig. 8, Von Misses-Inner Pressure behaviour of WM LSI SAW as calculated in ABAQUS. The behaviour of von Misses strain with inner pressure as calculated in ABAQUS is illustrated in figure 9, this behaviour showed linearity during loading and unloading with a little bit changing during plasticity. The behaviour of hoop stress-strain curve as indicated in figure (5-8), the yielding for first load starts at 13.34 MPa of inner pressure (531.5 MPa of hoop stresses), while for second load the plastic deformation initiated at 14.8 MPa of inner pressure (586.1 MPa of hoop stresses).

Fig. 9. Pressure-Von Misses strain of LS1

Fig. 8, Von Misses-Inner Pressure behaviour of WM LSI SAW as calculated in ABAQUS.