TY - JOUR A1 - Mishurova, Tatiana A1 - Rachmatulin, Natalia A1 - Fontana, Patrick A1 - Oesch, Tyler A1 - Bruno, Giovanni A1 - Radi, E. A1 - Sevostianov, I. T1 - Evaluation of the probability density of inhomogeneous fiber orientations by computed tomography and its application to the calculation of the effective properties of a fiber-reinforced composite JF - International Journal of Engineering Science N2 - This paper focuses on the experimental evaluation of one of the key microstructural Parameters of a short-fiber reinforced composite – the orientation distribution of fibers. It is shown that computed tomography (CT) produces results suitable for reconstruction of the orientation distribution function. This function is used for calculation of the effective elastic properties of polymer-fiber reinforced concrete. Explicit formulas are derived for overall elastic moduli accounting for orientation distribution in the frameworks of the noninteraction approximation, the Mori–Tanaka–Benveniste scheme, and the Maxwell scheme. The approach illustrated can be applied to any kind of composite material. KW - Computed tomography KW - Orientation distribution KW - Effective properties KW - Fiber-reinforced composite PY - 2018 DO - https://doi.org/10.1016/j.ijengsci.2017.10.002 SN - 0020-7225 SN - 1879-2197 VL - 122 SP - 14 EP - 29 PB - Elsevier AN - OPUS4-42814 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Trofimov, A. A1 - Mishurova, Tatiana A1 - Lanzoni, L. A1 - Radi, E. A1 - Bruno, Giovanni A1 - Sevostianov, I. T1 - Microstructural analysis and mechanical properties of concrete reinforced with polymer short fibers JF - International journal of engineering science N2 - The paper focuses on the development of a methodology for quantitative characterization of a concrete containing polymer fibers and pores. Computed tomography (CT) characterization technique is used to provide input data for Finite Element Method (FEM) simulations and analytical modeling based on micromechanical homogenization via the compliance contribution tensor formalism. Effective elastic properties of reinforced concrete are obtained experimentally using compression testing, analytically in the framework of Non-Interaction approximation and numerically performing direct FEM simulations on specimen with reconstructed microstructure. It is shown that CT produces results suitable for implementation in numerical and analytical models. The results of analytical and numerical modeling are in a good agreement with experimental measurements providing maximum discrepancy of ∼ 2.5%. KW - Reinforced concrete KW - Computed tomography KW - Finite element method KW - Micromechanics KW - Homogenization PY - 2018 DO - https://doi.org/10.1016/j.ijengsci.2018.09.009 SN - 0020-7225 SN - 1879-2197 VL - 133 SP - 210 EP - 218 PB - Elsevier AN - OPUS4-46153 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -