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As a simple but fundamental structural member, a circular ring has attracted attentions in applied mechanics.Recently, Yu and Bao [1] studied the large dynamic deformation of a free-flying circular ring made of elastic, perfectly plastic material after it impinges on a rigid wall with initial velocity V0, as well as the following rebound process.From a dimensional analysis, it is found that the problem is governed by two non-dimensional parameters, i.e.non-dimensional thickness rη ≡ h/R and non-dimensional impact velocity v ≡ V0/VY, where VY≡Y/(Ep)1/2 denotes the yield velocity of the material.Within a domain of these two non-dimensional parameters a systematic finite element simulation has been conducted together with preliminary theoretical considerations.