Distance from hole centre, r (mm) 3 4 5 6 7 8 Residual tangential stress, σθθ (MPa) -500 -400 -300 -200 -100 0 100 200 Garcia-Sachs FE Average 9 Figure 1: Measured residual tangential stresses after cold expansion compared with averaged finite element results. Figure 2 shows Garcia-Sachs and finite element averaged stresses for the case where the residual stresses have been relaxed following creep relaxation with superimposed applied load. The agreement is reasonable although the measured residual stresses show more relaxation close to the hole edge than the finite element predictions. Distance from hole centre, r (mm) 3 4 5 6 7 8 Residual tangential ttress, σθθ (MPa) -500 -400 -300 -200 -100 0 100 200 Garcia-Sachs FE Average 9 Figure 2: Measured residual tangential stresses after cold expansion followed by creep relaxation compared with averaged finite element results.
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