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Teary fission in 197Au+197Au collisions at 15A MeV is investigated by using the improved quantum molecular dynamical (ImQMD) model.The experimental mass distributions for each of the three fragments are reproduced for the first time without any freely adjusting parameters.The mechanisms of teary fission in central and semicentral collisions are dynamically studied.In direct prolate teary fission,two necks are found to be formed almost simultaneously and rupture sequentially in a very short time interval.Direct oblate teary fission is a very rare fission event,in which three necks are formed and rupture simultaneously,forming three equally sized fragments along space-symmetric directions in the reaction plane.In sequential teary fission a binary division is followed by another binary fission event after hundreds of fm/c.