CRASHWORTHINESS ANALYSIS OF FOAM-FILLED DOUBLE-HAT MULTI-CORNER CRASH BOX SUBJECTED TO AXIAL LOADING

• Main Author: Muhammad Nuvra Ardhenas, Elga
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/49073
• Institution: Institut Teknologi Bandung

Any kind of transportation is always concerned about passenger safety. In the aviation field, there is a lot of components which intended to be a protector of the passenger. One of the main components is the crashworthiness structure. During a collision, the crashworthiness structure will absorb the impact energy as much as possible to protect the occupants. The crash box is one of the crashworthiness structures which usually placed on the below structure of aircraft. Whereas for cars and trains, the crash box is usually placed on the front and back area. This final thesis document presents a numerical simulation of a double-hat multi-corner crash box subjected to axial impact loads. The crash box structure being analyzed has 16 corners. First, a manufacturing simulation of the column was carried out by using Hyperform software to produce a model with residual strain and stress. The result from Hyperform shows there is no failure occurs. Then this model was used as an input to axial impact numerical simulations by using LS-DYNA software. The result from LS-Dyna is then compared with the experimental test done by Adi Kusnanda. There are differences between numerical simulation with the experimental test. These differences can be due to several reasons, such as an inaccurate stress-strain curve in numerical analysis or other material input. Impact simulations were also carried out to the crash box filled with aluminum foam (Alporas). Two different foam were used in this study: The first foam model was already tested experimentally by Dannemann and Lankford Jr (Model 1 foam). Whereas the second foam model was tested by A. Fadlilah using the Split Hopkinson Pressure Bar technique (Model 2 foam). The numerical simulation results showed that adding foam-filler to the crash box increases the crash box performance. The results also showed that Model 2 foam could absorb more energy than the Model 1 foam. But since the crash box with Model 2 foam is very stiff, it is not suitable for crashworthiness structure.