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On the anisotropy of lotus-type porous copper

Fiedler, Thomas and Veyhl, Christoph and Belova, Irina Veniaminovna and Tane, Masakazu and Nakajima, Hideo and Bernthaler, Timo and Merkel, Markus and Öchsner, Andreas and Murch, Graeme Elliott (2012) On the anisotropy of lotus-type porous copper. Advanced Engineering Materials, 14 (3). pp. 144-152. ISSN 1438-1656

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Official URL: http://dx.doi.org/10.1002/adem.201100205

Abstract

This paper addresses the thermal and mechanical properties of lotus‐type porous copper. Due to their cellular metal characteristics in combination with strong anisotropy, lotus‐type materials exhibit unique properties. As an example, directional thermal conduction enables the controlled transport of thermal energy in the pore direction without the need of strong thermal insulation. In this paper, thermal and mechanical finite element analyses are performed. The effective thermal conductivity, Young's modulus, and the 0.2%‐offset yield strength are determined. Special consideration is given to the anisotropy of the material. In order to guarantee accurate discretization of the complex material geometry, calculation models are directly based on computed microtomography data. Elastic properties are compared to experimental data and good agreement is found. For the characterization of the thermal anisotropy, a second numerical approach, called the Lattice Monte Carlo method, is used along with thermal finite element analysis. In addition to the numerical methods, the analytical Maxwell, Dulynev, and Bruggeman models are applied. Good agreement for the application of two‐dimensional versions of Dulynev's and Bruggeman models is observed whereas the Maxwell model significantly overestimates the material properties.

Item Type:Article
Uncontrolled Keywords:lotus‐type porous copper, thermal energy, Lattice Monte Carlo method
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mechanical Engineering
ID Code:47296
Deposited By: Narimah Nawil
Deposited On:22 Jun 2015 05:56
Last Modified:31 Mar 2019 08:38

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