Experimental and numerical modeling of the heterogeneous materials fracture

Abstract
The complex evolution and hierarchical approach to the modeling of the heterogeneous viscous-plastic damaging media fracture process is considered. The developed for the stochastic crack growth in the defects array model allowed visualizing the process of crack propagation on the base of microdefects nucleation mechanism, the small cracks growth and coalescence under the external stress and hydrogen effect. Macroscopie model based on the deterministic approach and could simulate the damage accumulation and fracture process of metal during the hydrogen induced delayed fracture. Experimentally by the optical, electronic probe fractography and scanning tunneling "in situ" microscopy methods the statistical parameters and its evolution during the deformation of the heterogeneous material bas obtained. The possibility of model use for the modeling of aluminum alloy hot tearing during the solidification process bas shown. The evolution of the damage up to ultimate material state modeling in the scale of the part has shown.