P‐7.5: The study on ultimate bending performance of UTG

In this paper, the ultimate bending performance of UTG was studied. UTG samples of 30um thickness with different degrees of surface compressive stress, strengthening depth, edge collapse degree and in‐plane microdefects were selected for 2PB ultimate bending test. The results show that in‐plane microdefects have the greatest influence on UTG 2PB limit bending, the edge collapse size has the second influence on UTG 2PB limit bending, and the surface tensile stress and strengthening depth have the second influence on UTG 2PB limit bending. Therefore, the most fundamental means to improve the ultimate bending performance of UTG is to reduce the degree of microdefects in the UTG surface and effectively control the specifications of UTG edge breakage. At the same time, it is also important to characterize the degree of UTG microdefects and edge breakage.