From: Residual Stress Relaxation of Thin-walled Long Stringer Made of Aluminum Alloy 7050-T7451 under Transportation Vibration
Sample number
σx (MPa)
Stand deviation (MPa)
σy (MPa)
1
198
32
190
16
2
206
25
188
18
3
194
34
4
189
23
205
12
5
197
14
Mean value
196.8
23.2
195.6
18.8