Damage Simulation of High Performance Fiber Reinforced Concrete
نویسنده
چکیده
The simulation of damage and failure in short fiber reinforced composites like high performance hybrid-fiber reinforced cement composites is still a challenging task, due to the richness of failure mechanisms introduced by fibers on the mesoscale of the material. Randomly oriented, hooked steel fibers, like the Baekaert Dramix® fibers, sustainable modify the macroscopic failure behavior of the composite like increased compressive, tensile, flexural, and shear strength. On the mesoscale fibers introduce a multitude of additional mechanisms like fiber fracture, fiber bridging, fiber bending and matrix spalling for inclined fibers and finally fiber pull-out. Models for these materials must represent concrete as cohesive, frictional material with microstructure, and the different phases of fiber pull-out for 3D randomly oriented fibers. The Discrete Element Model of Kun&Herrmann is extended by randomly throwing additional fibers with the projected fiber length on the disordered twodimensional system. We demonstrated a numerical study on the tensile and flexural failure behavior with the proposed model for brittle matrix material, reinforced with short, ductile fibers. We observe stiffening, strengthening, strain hardening and softening, depending on the fiber content.
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