Papers by Author: Seyed Mohammad Hossein Hosseini

Abstract: The temperature dependence of mechanical properties of aluminum foams has been investigated. Youngs modulus and Poissons ratio have been determined from simulations of a unidirectional tensile test using a finite element model of aluminum foam networks. The Youngs modulus of the network structure for different relative densities and foam cell regularity factors have been plotted over temperature. It has been found that the Youngs modulus decreases with increasing temperature, whereas the Poissons ratio remains constant. This trend has been observed for various foam structures of different sizes, relative densities and network irregularities.

Abstract: The thermal properties of irregular open-cell and closed-cell metal foams are investigated via numerical simulation. The influence of relative density and cell irregularity on the thermal conductivity and thermal expansion of the foam structure is determined. It is concluded that the effective thermal conductivity of the foam structure depends linearly on the relative density, whereas no dependence on the degree of irregularity is observed. The effective thermal expansion coefficient of the foam structure is constant for the range of parameters considered.

Abstract: This paper investigates the thermal properties of metallic open-cell and closed-cell foam structures in space filling and non-space filling configurations. In both, i.e. open-cell and closed-cell structures, a linear trend depending on the relative density has been reported. However the closed-cell structures compared to open-cell ones have a higher thermal conductivity for the same relative density.

Abstract: This paper investigates the uniaxial mechanical properties of a new type of hollow sphere structures. For this new type, the sphere shell is perforated by several holes in order to open the inner sphere volume and surface. The mechanical properties, i.e. elastic properties and initial yield stress, of perforated hollow sphere structures in a primitive cubic arrangement are numerically evaluated for different hole diameters and different sphere wall thicknesses.

Abstract: This paper investigates the thermal properties of a new type of hollow sphere struc- tures. For this new type, the sphere shell is perforated by several conical holes in order to open the inner sphere volume. The effective thermal conductivity of perforated sphere structures in a primitive cubic arrangement is numerically evaluated for different material combinations and compared to sphere structures without perforation.