SPH-FEM連成によるセル構造体の圧縮特性評価

抄録

The purpose of this study is to elucidate the effect of inner fluid on compressive properties in cellular solids using SPH (Smoothed particle hydrodynamics)-FEM (Finite element method) technique. Numerical experiments were performed by SPH-FEM solver, RADIOSS. The analysis model were made with cell walls, inner fluid and the rigid walls. The cell walls were meshed using shell elements, and the inner fluids were filled with the SPH particles. Compressive simulations were performed by applying the constant velocity to the upper rigid wall. The constant velocities were 0.075, 0.75 and 7.5 m/s. Air-filled and no-air models were prepared to investigate the effect of the inner air on the compressive properties in the models. In the air-filled model, the flow load showed higher value in comparison with the no-air model. It was confirmed that the flow load was increased by increase of the inner air pressure. In this model, the influence of the applied velocity on the flow load could not be observed. The compressive numerical simulation was also carried out using the perforated models with same condition. In the perforated models, the compressive velocity dependence of the flow load was observed since the residual fluid did not have enough time to escape from the cell. It was clarified that the compressive properties of cellular solids were affected by the flow-out of the inner fluid.