13th International Conference on Fracture June 16–21, 2013, Beijing, China -4- Table 2. Levels of preload for both materials 2.2. Generated residual stress Under levels shown in Table 2, respective residual stress fields were generated. Figures 6 and 7 shown residual stress distribution around hole σyy for different applied preload for 2024 T351 and 6061 T6 Al-alloy respectively for specified levels. Interesting distributions of these residual stresses are along X-axis. X-axis is a planned path for crack propagation in mode I. Figure 8 shows variation of residual stress distribution σyy along X-axis for 2024 Al-alloy for different preload levels. It shows an increasing of compressive residual stress with increasing of preload levels at hole. was shown Figure 6. Stress contour for preload levels σp/σy for 2024 T351: (a) 1.047; (b) 1.102; (c) 1.212 (d) 1.350 Figure 7. Stress contour for preload levels for 6061 T6 σp/σy: (a) 1.19 ; (b) 1.23 ; (c) 1.39 Al-Alloy 2024 T351 6061 T6 1.047 1.19 1.102 1.23 1.212 1.39 σp/σy 1.350
RkJQdWJsaXNoZXIy MjM0NDE=