Numerical Analysis on the Coaxial Collision of Variable Section Bar and Application Prospect

In order to perform extensive research on the coaxial collision of elastic bar, finite element model was established based on LS-DYNA, the influences of the shape parameters of variable section bar on the stress wave were analyzed, producing mechanism of stress wave was discussed, and its application and development prospect in this field were also explored. The results show that, because of the variable section effect, the coaxial collision of variable section bar under conditions of some shape parameters can create the stress wave, which has the following characteristics: wave front rising is in the form of smooth concave curve, the rising time is longer and there is no waveform oscillations phenomenon. The characteristics are the intrinsic attributes of the coaxial collision of variable section bar, controlled mainly by minimum radius of variable section scope in bar, and length of variable section scope in bar exerts an influence on the partial difference; besides, the characteristics are not sensitive to the change of the loading speed. The laws obtained by the coaxial collision of variable section bar can be applied to many fields such as waveform shaping. Thus it can be seen, these laws extend the foundational theories, which can be of great theoretical and realistic significance, and moreover, its application prospect is wonderful.