Experimental study on springback behavior of SS304 thin sheet in micro V-bending process

Abstract

This study presents an experimental investigation into the springback behavior of thin stainless steel sheets during microscale bending. To generate different microstructures, the samples underwent four annealing cycles and were subsequently subjected to V-bending tests at three angles: 20°, 40°, and 60°. The final bending angles were measured both under loading and after unloading using an imaging technique combined with software analysis. The results demonstrate that reductions in sheet thickness and bending angle, as well as increases in grain size, lead to springback angle increases of 36%, 28%, and 49%, respectively. These findings significantly enhance the fundamental understanding of microscale deformation behavior and provide a robust foundation for developing reliable analytical models and optimized design guidelines for microforming processes.