PSI - Issue 28

C.D.S. Souto et al. / Procedia Structural Integrity 28 (2020) 139–145 Carlos D.S. Souto et al. / Structural Integrity Procedia 00 (2020) 000–000

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Fig. 5: Obtained S-N fatigue curves for both loading cases (preliminary results).

4. A note on residual stresses

Numerical simulations in COPRA R RF and COPRA R FEA RF are being conducted in order to obtain and analyze the Z-rail with internal residual stresses. These simulations are using both the real roll-forming machine, as well as the real elasto-plastic material obtained through experimental data. Figure 6 shows some initial results of these numerical simulations. The figure shows the residual tangential stresses on the Z-rail, left over from the cold roll-forming process. As shown in the figure, residual stresses in the inner surface

Fig. 6: Residual tangential stresses on the Z-rail.