A Study on the Shearing Process and the Burr Formation of Zircaloy-4 Sheet by using GTN Model

作者：Jeong Hyunsoo; Ha Jisun; Hwang Jihoon; Lee Hyungyil; Kim Dongchul; Kim Naksoo^*

来源：International Journal of Precision Engineering and Manufacturing, 2014, 15(10): 2167-2175.

DOI：10.1007/s12541-014-0578-4

• Zircaloy-4
• Ductile fracture
• Johnson-Cook model
• GTN model
• Burr
• Shearing process

In this study, we developed the finite element (FE) method to predict the features of sheared edges and burr formation for Zircaloy-4 sheet used for spacer grids of nuclear fuel rods. In order to numerically simulate the ductile fracture of the sheet metal, Johnson-Cook (I-C) flow stress model and Gurson-Tvergaard-Needleman (GTN) ductile fracture model are used. To validate the FE model, the shearing force and the sheared edges obtained from the shearing test were compared with the numerical simulation results. The results showed good agreements with the experimental results. In order to measure the characteristic length of sheared edges including the burr, L-shaped shearing test was pedbrmed And then we investigate the major factor that affects the burr formation. Especially we showed that it is possible to predict the burr formation using FE model. It is confirmed by comparing the experimental results and the FE simulation results such as load-stroke curve and features of sheared edges. Therefore, the tendency of burr formation for zircaloy-4 sheet in the shearing process is systematically predicted by applying the developed finite element analysis method

• 出版日期2014-10