چكيده به لاتين
Nowadays, by increasing the number of cars and fuel consumption in the world on the one hand and increasing in accidents on the other hand, it has led to the need to reduce the weight of cars and safety standards in parallel. Researchers suggest a number of ways to reduce weight, including replacing steel with lighter materials. Extensive efforts have also been made to secure vehicles, especially to prevent the transmission of accidents force to occupants. For this purpose, in this study, energy absorbers are selected and then the behavior of aluminum tapered multi-cell is investigated. Since the construction of these structures is difficult or impossible with screw, rivet or weld joints, adhesive joints have been used. The numerical simulation section of this study was performed by Finite Element Methods (FEM) in Abaqus software. The conditions and method of making samples in the following of introducing the appropriate sheet available in Iran market, to fabricate energy absorber for experiemental and numerical tests is reffered. A comparison between the results of experimental data and the result of FE methods has been created. The present study shows energy absorption of structures that fabricate by Araldite 2015 adhesive and 3105 aluminum alloy sheets with tapering, especially in single-cell tapers, increased by about 6% in the case of 3 degrees compared to 0 degree angles and about 15% by 5 degrees compared to 3 degrees. However, the increase in energy absorption has not led to such an increase in Specific Energy Absorption (SEA). Also, by addition of cells, the Crush Force Efficiency (CFE) increases and the best CFE performance is obtained in the 3×1 with 3-degree angle taper with about 35% efficiency.
