الفهرس 
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Abstract
Metal foams are characterized by low density property with multifunctional applications, such as lightweight structural, crash protection, heat exchangers, and acoustic insulation.
Metallic foams are commercially available as closed and open-cell foams. The closed-cell foams be marked by unstable of mechanical properties which is referred to defects such as cell wall corrugation, unequal pores size and density variations.
This work focuses practical and theoretical approach to study the effect of pores size on the mechanical behavior of porous aluminum with open-cell structure. Three experimental methods were used to produce cellular aluminum with open pore cells. The first process is casting of molten aluminum around spherical clay granules with different sizes, which act as space holder material.
The second is sintering of compacted aluminum powder with different concentrations and particle size of salt particles.
The last method is shaping of regular open cell structure by drilling operation of solid cubic. These specimens are used to validate the numerical results from FE ABAQUS program version 6.10-1. The constitutive models of regular open-cell holes were carried out, in order to study the effect of pore size on behavior of cellular aluminum under quasi-static and dynamic loading conditions.
The results showed that, the using of cellular metal can save material to about 40%. In addition, the relative density is the important factor affecting the strength of aluminum cellular structure.
For cellular aluminum specimens produced by powder metallurgy process, the absorbed energy increases by double with the decease of NaCl contents (porosity) from 40 to 20 wt.%
The results of FEA-analysis showed that, the models, with small pores, has small effect on the increase of compressive strength where the difference has not exceed 5%. Also, the absorbed energy of models with small pore size was increased by a factor of 25% greater than the models contain large pores at the same relative density.