PSI - Issue 10

A. Hein et al. / Procedia Structural Integrity 10 (2018) 219–226 A. Hein and V. Kilikoglou / Structural Integrity Procedia 00 (2018) 000 – 000

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fibers indeed provided several advantages. In contrast to the additional thermal insulation of fibrous pore structures in comparison with arbitrary pore structures the mechanical properties were not affected to the same extent. Compared to flat pores, simulations of fibrous pore structures indicated a smaller impact on elasticity and thus probably also on strength. Furthermore, in terms of manufacture and mixing clay paste with organic materials fibers can probably be placed easier in a preferred orientation than oblate shaped materials.

Fig. 5 . Relative elasticity (Young’s Modulus) in relation to total porosity for different pore shapes: The dashed curve indicates t he theoretical elasticity of porous materials with isometric, convex pores (Pabst and Gregorova (2014)) while the dotted curve presents an approximation for the case of randomly distributed overlapping spheres (Roberts and Garboczi (2000)).

Fig. 6. Relative thermal conductivity in relation to total porosity for different pore shapes: The dashed curve indicates the theoretical thermal conductivity of materials with random porosity (Litovsky and Shapiro (1992)).