Effect of springback on wall thinning and section distortion for high strength TA18 tube in NC bending

The influence of the springback in high strength TA18 tubes on the wall thinning and section distortion under different process parameters was investigated using ABAQUS Explicit/Standard finite element models. The results show that the wall thinning ratios after unloading-springback are less than 10% under different process parameters for high strength TA18 tubes, while the section distortion ratios after springback are more than 35%, even 60% except a few measured points. The "platform" of section distortion ratio at stable forming zone disappears after springback.