Моделирование поврежденности и разрушения силицидов в латуни при пластической деформации

Abstract

The paper deals with simulating damage and fracture of the silicides of complexly alloyed brass in upsetting under the plane strain state in view of their geometry, mechanical properties and the stress state during defor-mation.Simulation is based on structurally - phenomenological approach. It is shown that deformation of alloyed brass basically occurs due to the plastic matrix while fragile particles of silicides are destructed. By results of experiments and finally - element simulating the inhomogeneous of silicides stress state at mezolevel are obtained. Distribution func-tions of a stress state coefficient are received. Relationship between ultimate strains of silicides fragile particles and the stress state coefficient is determined. By means of this dependence modelling of damage accumulation in silicides at plane strain compressing of 4% and 25 % with additional hydrostatic pressure of 850 MPa is carried out till the mo-ment of their destruction. It is shown, what silicides destruction is probably to decrease at loading due to using of stress state schemes ensuring high level of compressing stresses.andapproximating the stress state of material to uniform at mezolevel.