Cold Expansion Strengthening of 7050 Aluminum Alloy Hole: Structure, Residual Stress, and Fatigue Life

Figure 13

Radial residual stress cloud diagram under different squeezing amounts (on the left is the extrusion inlet and on the right is the extrusion outlet).

(a) At 3% squeeze

(b) At 3.6% squeeze

(c) At 4% squeeze