Numerical Simulation of Steel Fiber Pull-Out Process Based on Cohesive Zone Model and Unified Phase-Field Theory

In steel fiber reinforced concrete, the interface is a very complex and weak structure. It because of layer between matrix that reinforcing toughening properties cannot be fully exerted. The bond performance core meso-mechanical concrete. To study its influence on mechanical three-phase finite element models pull-out are established based cohesive zone model unified phase-field theory by means FEM in this paper. simulated zero-thickness element, process concrete analyzed to provide basis for fracture research paper, factors such as embedment depth, length–diameter ratio, angle, fibers considered, relevant conduct numerical simulations fibers. simulation results good agreement with experimental results, verifies reliability model. show regularized (PF-CZM) has certain reliability; peak load increases an increase depth fiber, decreases ratio angle fiber; controlling strength matrix, reinforcement effect can improved; PF-CZM characterization damage failure evolution matrix.