*3.1. E*ff*ects of Prebending Radii on Mechanical Properties*

The mechanical properties of 7075 aluminum alloy aged at different radii of preloading are shown in Table 2, where it can be seen that with the increase of prebending radius ρ, the tensile strength σb, yield strength σ0.2, and elongation δ of 7075 aluminum alloy increased. The results indicate that the large prebending radius can improve the mechanical properties of the alloy. These effects will be discussed in-depth in Section 3.3.


**Table 2.** Mechanical properties of 7075 aluminum alloy at different preloading radii.
