NUMERICAL SIMULATION OF IMPACT PERFORMANCE FOR PMI FOAM FILLED CORRUGATED BOARD SANDWICH STRUCTURE

摘要

The sandwich structures have the advantages of light weight, high strength and strong versatility. It is widely used in various fields such as aerospace, civil engineering, marine engineering. Among them, the corrugated sandwich structure has the advantages of high specific stiffness and specific strength. It has significant advantages in terms of explosion resistance and impact resistance. PMI has higher strength than other foamed polymers and has the advantage of low density. Since PMI has good formability, this paper fills it into corrugated sandwich structure to form a PMI sandwich structure. Then, an impact resistance analysis of the sandwich structure was performed. First, the structure is modeled by Soildworks software. This paper uses LS-DYNA to numerically simulate the sandwich structure of Split Hopkinson Pressure Bar impact PMI filled corrugated plate. This paper obtained the stress-strain curve and energy of the incident bar and the transition bar. This method is used to verify the impact resistance of the sandwich structure. In this paper the same size panels and core density were used. Meanwhile, five different striker velocities and different fiber layers were applied as variables. The Hopkinson bar impacted the sandwich structure for simulation. Finally, the impact resistance of PMI-filled corrugated sheets is obtained.