Numerical modeling and experimental validation of fiber pull-out behavior in carbon-reinforced concrete

The behavior of carbon-fiber reinforced concrete (CFRC) significantly depends on the morphology and physico-chemical properties of the interphase between the fiber and the matrix. To enhance the toughness of the composite, bio-inspirations like the structure of nacre or the glass sponge filaments are adapted (project B03). Similar structures are applied as interphase between fiber and matrix to transfer their beneficial mechanical properties to the CFRC. The failure behavior of single-fiber composites is investigated using the single fiber pull-out (SFPO) test, focusing on different interphase properties. Accurately capturing fiber-matrix interaction within the finite element method is crucial for precise CFRC modeling. This study simulates the SFPO using the membrane mode enhanced cohesive zone element (MMECZE) formulation. These elements consider membrane damage along with classical traction-separation laws used in standard cohesive zone elements, thereby improving the representation of the fiber-matrix interface behavior.

To project C05.