セル構造体における内部流体の流出特性

抄録

The purpose of this study is to elucidate the influence of the behavior of the internal fluid on the mechanical properties of the cell structure by the fluid-structure interaction analysis using smoothed particle hydrodynamics and the finite element method. Numerical experiments were performed using the SPH-FEM solver RADIOSS. The analytical model consists of upper and lower rigid walls, cell structures, and internal fluids. The cell structures were meshed using tetra solid elements, and the SPH particles were filled inside the shell as the inner fluid. Compressive simulations were performed by applying a constant velocity to the upper rigid wall. Constant velocities were 2 and 10 m/s. The numerical analysis models used in this study are three types (air-filled model, water-filled model, and empty model) with different internal fluids. At a compressive velocity of 10 m/s, the air-filled model showed slightly higher flow stress values than the empty model. On the other hand, the water-filled model showed significantly higher flow stress compared to the empty and air-filled models. It was confirmed that the flow stress increased due to the increase in internal fluid pressure. On the other hand, at a compressive velocity of 2 m/s, the air-filled and water-filled models showed slightly higher flow stress values than the empty model. This is because the internal fluid can flow without being compressed as the compressive velocity decreases. Fluid-structure interaction numerical analysis reproduces the strain rate dependence caused by the outflow behavior of the internal fluid.