الفهرس 
LITERATURE REVIEWOnly 14 pages are availabe for public view
 |  | from | 186 |  |  |
| | | from | 186 | | |
Abstract
This research is dedicated to the study of the effects of the passenger cars frontal energy absorbers design on its ability to absorb and dissipate impact energy. Energy absorbers (Crashworthiness) are used to dissipate collision energy upon plastic deformation to prevent critical parts damaging of the vehicle structure. In this work, experimental approach is used to determine the energy absorption and the mechanical behavior of thin-walled aluminum structures with various shapes of different 100 cold-formed aluminum specimens under quasi-static axial compression testing showing the effect of shape (Triangle, Square, and Hexagonal), construction (Simple-cell or Multi-cells), Filling (Empty, Foam or Styropor), and adhesive material (clear Epoxy or clear duct tape) used to connect each sample. This research also summarizes the history of thin-walled structures testing from 60’s to present. An experimental testing machine (WDW-10 Computer Control Electromechanical Universal Testing Machine) was used to carry out the laboratory experiments, where load-deflection properties for Simple and Multi cell thin-walled tubes specimens that utilized in passenger cars chassis construction were measured. There was good consistency between the testing data. The results showed that the energy absorption capacity of simple hexagonal sections is greater than that of other simple sections by 147.7%. As well as, simple hexagonal sections absorbed the greatest amounts of energy per unit of mass with 95.4% more than other simple shapes. For multi-cell specimens, square section with blades connected to middle of each side has the maximum energy absorption capacity with 208.1% and the higher SAE with 224.3% than other multi-cell specimens. And for hybrid specimens, the Styropor filled simple square has the lightest weight and the maximum specific absorbed energy with 485.9% higher than other specimens.
A comparison of the results showed that the hexagonal geometry had the greatest maximum load capacity than triangle and square samples in simple use because it has the maximum number of walls and edges, but in multi-celling or hybrid filling specimens, square section has the lead and here it can be concluded the reason of using a square section in the frontal bumper assembly of a passenger car.
Finally, this work proves that square section filled with styropor is better than that filled with foam in specific absorbed energy by 22.84%.