Micromechanical modeling of the constitutive response of FRCM composites. (10th March 2020) - Nerilli, Francesca
Highlights: The constitutive behavior of FRCM composites is numerically investigated. The proposed micromechanical model accounts for the nonlinear micromechanisms. The cracking and the slippage of the fibers within the mortar are taken into account. The shear behavior of FRCM material is investigated, also under cyclic loading. Abstract: In this paper, the tensile and shear constitutive behavior of Fiber Reinforced Cementitious Matrix (FRCM) composites is addressed. A nonlinear finite-element computational approach is developed, by accounting for the micromechanical mechanisms via the introduction of interface elements inside and between the FRCM constituents, i.e. fibers and mortar. The damage, the friction and the unilateral contact are considered for reproducing the mortar cracking and the slippage between the fibers and the mortar. The numerical approach is illustrated and it is validated with an available experimental result, highlighting the effectiveness of such proposed modeling approach for reproducing the constitutive tensile behavior of FRCM materials. Finally, the shear behavior is investigated, also considering cyclic loading patterns under different compressive load levels.