ANALISIS BEBAN IMPAK BALISTIK PADA BODY ARMOR BERBAHAN KEVLAR-29/EPOXY DAN NANOKRISTAL SELULOSA/EPOXY

• Main Author: Priskila Hasian Simanju, Tarida
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/38904
• Institution: Institut Teknologi Bandung

Ballistic impact analysis using the finite element method had been vastly applied in numerous fields, especially in the case of ballistic impact on composite body armor. In this thesis, ballistic impact simulation was performed on composite body armor in order to study the ballistic responses of the body armor due to changes made in several parameters. The preprocessing was performed using LS-Prepost and the constructed model was later processed by LS-DYNA Program Manager. The analysis was begun with the reconstruction of the work of [1] to validate the finite element model. After the validation process, the analysis proceeded with parametric studies. The parametric studies were done by varying parameters such as the coefficient of frictions, the value of DFAIL parameters, the overall thickness of the laminate, as well as altering the material utilized in the work of [1], which is E-Glass/Polypropylene, with Kevlar-29/Epoxy. Ballistic impact simulation was also done for Cellulose Nanocrystals/Epoxy material. For this material, both the experimental and the theoretical properties of the material were simulated and the results obtained were compared. The final results showed the residual velocity of bullet that impacted E-Glass/Polypropylene target plate was 105 m/s. Additionally, it was also shown that the DFAILM and DFAILT parameters, the overall thickness of the laminate, as well as the coefficients of friction had a significant effect on the ballistic responses of the target. Moreover, the simulation results showed that Kevlar-29/Epoxy had better ballistic resistance than both E-Glass/Polypropylene and Cellulose Nanocrystals/Epoxy with experimental properties. However, the target plate that was assigned with Cellulose Nanocrystals/Epoxy with theoretical properties was shown to have the most superior ballistic resistance among the materials used in this research. Lastly, the simulation of ballistic impact on E-Glass/Polypropylene was done by utilizing solid elements to model the target plate. The residual velocity of the bullet impacting the solid target plate was 113.6 m/s, while the residual velocity of the bullet impacting the shell target plate was 105 m/s. In other words, the result obtained from the former simulation showed a good agreement with the result obtained from the latter simulation.