Simulation Of 3D Non-Planar Crack Propagation
R. Chandwani, C. Timbrell
NAFEMS World Congress 2007, Vancouver, Canada, May 22-25 2007
Abstract:
Numerical modelling of three dimensional (3D) non-planar fatigue crack
growth under mixed mode conditions represent a crucial factor in
fracture mechanics in order to assess the residual life of components.
This paper focuses on developing a damage tolerance approach that can be
used for the design of aeroengine shaft components under the general
mixed-mode loading conditions in the presence of stress-raising
features. The initial work has validated numerical results against crack
growth measurements on uniaxial tensile specimens under Mode-I loading.
Then, more realistic loading scenarios have been applied on shafts to
investigate the influence of different parameters (e.g. crack
orientation) on fatigue crack growth. All of the present work is based
on linear elastic fracture mechanics approaches, including the Paris and
Walker theories.