Coupled Crystal Plasticity–Phase Field Fracture Simulation Study on Damage Evolution Around a Void: Pore Shape Versus Crystallographic Orientation
M. Diehl, M. Wicke, P. Shanthraj, F. Roters, A. Brueckner-Foit, D. Raabe,
Volume: 69(5). Pages: 872--878
DOI: 10.1007/s11837-017-2308-8
Published: 2017
Abstract
Various mechanisms such as anisotropic plastic flow, damage nucleation,
and crack propagation govern the overall mechanical response of structural
materials. Understanding how these mechanisms interact, i.e. if they
amplify mutually or compete with each other, is an essential prerequisite
for the design of improved alloys. This study shows—by using the
free and open source software DAMASK (the Düsseldorf Advanced Material
Simulation Kit)—how the coupling of crystal plasticity and phase
field fracture methods can increase the understanding of the complex
interplay between crystallographic orientation and the geometry of
a void. To this end, crack initiation and propagation around an experimentally
obtained pore with complex shape is investigated and compared to
the situation of a simplified spherical void. Three different crystallographic
orientations of the aluminum matrix hosting the defects are considered.
It is shown that crack initiation and propagation depend in a non-trivial
way on crystallographic orientation and its associated plastic behavior
as well as on the shape of the pore.