A fast forecast method for dynamic stress of cylinders entering water

At present, the dynamic stress of a cylinder during water entry is generally investigated by the explicit dynamics method involving multiphases, which has a long calculation period. In this paper, a fast forecast method for dynamic stress of cylinders entering water is proposed. The water impact is replaced by an equivalent classical impact load, and the explicit dynamic analysis of multiphases is transformed into the implicit dynamic analysis of a single phase. Therefore, the dynamic stresses of cylinders can be solved rapidly and the relative errors with the results in existing literature are less than 10%. This study can be used to evaluate the dynamic stress and strength of cylindrical structures in a relatively short time.