Abstract
This paper traverses failure phenomenon about the piston rod of rapping device. Through the ANSYS/ls-dyna software, the finite element analysis was carried out on the piston rod ,force of the impact on the piston rod was taken as the form of triangular pulse load, whose time was lasting 0.05s, and it can get the maximum load in 0.025s. Maximum stress occured at the fillet of the piston rod are obtained. Based on nonlinear finite element method for transient dynamic analysis of the piston rod , analysis results are consistent with the actual conditions, and demonstrates the feasibility of finite element analysis.
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