MODEL VALIDATION OF COMPOSITE-BASED LIGHTWEIGHT STRUCTURE SANDWICH PANEL FOR RESERVED ENERGY STORAGE SYSTEM (RESS) PROTECTION

• Main Author: Daniel
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/71271
• Institution: Institut Teknologi Bandung

This research works on the validation of composite-based laminated sandwich panel with the Navy Truss (NavTruss) model for Reserved Energy Storage System (RESS). The sandwich panel structure protection is proposed to protect the RESS during the ground impact event. The RESS using the lithium-ion batteries is vulnerable to large deformation which can lead to thermal runaway. The experiment idea emerges from the idea of creating an impact setup with medium speed and moderate-weight impactor, hence its specifications are between the drop weight testing, which has enormous weight and low speed, and the ballistic testing, in contrast with the drop weight. The equipment basic platform uses Split Hopkinson Pressure Bar (SHPB), replacing the incident and transmitter bars with the sandwich panel. The Nitrogen propellant is also changed with Helium, a much faster gas to supply sufficient momentum. The first experiment is done on an aluminum plate at a lower speed than the actual case, then the result is simulated using non-linear explicit finite element simulation software LS-Dyna. The validation shows similar resemblance of the experiment both physically and numerically. For the sandwich panel experiment, the validation model also gives similar result with certain parameter tuning. Further simulations are conducted in order to keep the jellyroll deformation within the safety limit. The sandwich panel needs further reinforcement on the lower layer thus making it the optimum design to protect the RESS so far. Among other model simulated including the previous underbody structure and also aluminum BRAS structure, the reinforced model has the lowest Specific Energy Absorption (SEA) which shows that SEA cannot be the defining factor of structural performance. Energy balance validation is examined for the final models.