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The crack of AgSnO2 single contact in the cold upsetting process was studied, and the flow stress mathematical model of silver wire material was fit by converting the tensile test curves of silver wire material into true stress-strain data. Then, the cold upsetting process of the AgSnO2 single contact was simulated by the finite element method, and the distributions of equivalent stress and strain during the cold upsetting process were gained. The results show that the bigger the tensile stress is closer to the outer layer, and the smaller the radial compressive stress is closer to the outer layer. Furthermore, the unit pressure of the deformed object increases gradually from the outside to the inside, so the position of the maximum diameter of contact is easy to crack. In addition, the position and extent of crack are predicted accurately. Thus, the crack begins to form when the deformation reaches the material Damage value, which increases with the increasing of the deformation degree. Finally, the simulated results are verified by experiments, which are in good agreement with the test results.
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