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Numerical and experimental analysis of the closed-cell aluminium foam under low velocity impact using computerized tomography technique

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Acta mechanica Sinica 2019年第1期35卷 144-155,I0005页

作者： S.Talebi m.sadighi m.m.Aghdam Department of mechanical Engineering Amirkabir University of TechnologyTehranIran

In the present work, the response of closed-cell aluminum foams under low-velocity impact has been studied numerically and experimentally. Computerized tomography is employed to access three-dimensional (3D) microstructure of the closed-cell aluminum foam. Effective parameters including foam density and the velocity of impactor on foam dynamic behavior are investigated. In order to show the validity and accuracy of results, some static experiments and low-velocity impact tests have been conducted. Results in dicate a remarkable agree me nt between the simulation and experimental data. moreover, the results show that by increasing the density of foam samples, the highest difference between numerical and experimenidi results for peak stress and absorbed energy are 35.9% and 6.9%, respectively, which is related to the highest density. For impact velocities ranging from 3.1 to 4.2 m/s, the maximum discrepancy in peak stress and absorbed energy occur at an inipact velocity of 3.1 m/s in which corresponding errors are 33.3% and 6.6%, respectively. For the impact velocity of 40 m/s, the highest increase in peak stress and absorbed energy are 667.9% and 370.3% associated with the density of 0.5 and 0.3 g/cm^3, respectively.

关键词： Finite element analysis Impact Aluminum foam Experimental analysis Energy absorption

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Investigation of a mutual interaction force at different pressure amplitudes in sulfuric acid

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Chinese Physics B 2011年第8期20卷 454-459页

作者： Nastaran Rezaee Rasoul sadighi-Bonabi mona mirheydari Homa Ebrahimi Department of Physics Sharif University of Technology11365-91TehranIran Department of Physics Islamic Azad University Central Tehran BranchTehranIran

This paper investiages the secondary Bjerknes force for two oscillating bubbles in various pressure amplitudes in a concentration of 95% sulfuric acid. The equilibrium radii of the bubbles are assumed to be smaller than 10 μm at a frequency of 37 kHz in various strong driving acoustical fields around 2.0 bars （1 bar=10^5 Pa）. The secondary Bjerknes force is investigated in uncoupled and coupled states between the bubbles, with regard to the quasi-adiabatic model for the bubble interior. It finds that the value of the secondary Bjerknes force depends on the driven pressure of sulfuric acid and its amount would be increased by liquid pressure amplitude enhancement. The results show that the repulsion area of the interaction force would be increased by increasing the driven pressure because of nonlinear oscillation of bubbles.

关键词： multi-bubble sonoluminescence secondary Bjerknes force coupled and uncoupled state,nonlinear oscillation

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A unique circular path of moving single bubble sonoluminescence in water

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Chinese Physics B 2011年第7期20卷 252-258页

作者： Rasoul sadighi-Bonabi mona mirheydari Homa Ebrahimi Nastaran Rezaee Lida Nikzad Department of Physics Sharif University of TechnologyTehran 11365-91Iran Department of Physics Islamic Azad University Central Tehran BranchTehran 14676-86831Iran Laser and Optics Research School Tehran 14676-86831Iran

Based on a quasi-adiabatic model, the parameters of the bubble interior for a moving single bubble sonoluminescence （m-SBSL） in water are calculated. By using a complete form of the hydrodynamic force, a unique circular path for the m-SBSL in water is obtained. The effect of the ambient pressure variation on the bubble trajectory is also investigated. It is concluded that as the ambient pressure increases, the bubble moves along a circular path with a larger radius and all bubble parameters, such as gas pressure, interior temperature and light intensity, increase. A comparison is made between the parameters of the moving bubble in water and those in N-methylformamide. With fluid viscosity increasing, the circular path changes into an elliptic form and the light intensity increases.

关键词： sonoluminescence bubble trajectory fluid viscosity bremsstrahlung

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