All fibers bridging the crack are stretched (load is increasing- second peak on the curves). After that fibers start to rupture and its ends with friction are pulling out (curves after second peak). Relatively low polymer material Young modulus is leading to two peaks formation on the curves what wasn’t recognized for materials with high modulus fibers. Single polymer fiber is embedded into elastic matrix and was subjected to external applied pulling load was numerically simulated. Numerical modeling was performed using 3D FEM approach.