Micromechanical Finite Element Simulations Of Crack Propagation In Silicon Nitride

Micromechanical Finite Element Simulations of Crack Propagation in Silicon Nitride

Silicon nitride is used for challening applications like cutting inserts or forming rolls. The extreme strength and toughness of the material is achieved by an interaction between the microstructure and fracture behaviour on the microlevel. In order to understand these mechanisms, detailed unit cells have been defined and used for the determination of the effective fracture properties. The results have been used for the implementation of an effective continuum damage mechanics model.

Micromechanical Finite Element Simulations of Crack Propagation in Silicon Nitride

Finite element simulation of dislocation based plasticity and diffusion in multiphase materials at high temperature

A single-crystal plasticity model as well as a gradient crystal plasticity model are used to describe the creep behavior of directionally solidi?ed NiAl based eutectic alloys. To consider the transition from theoretical to bulk strength, a hardening model was introduced to describe the strength of the reinforcing phases. Moreover, to account for microstructural changes due to material ?ux, a coupled diffusional-mechanical simulation model was introduced.