Simulation Of Intergranular Crack Nucleation
And Evolution In Polycrystal Metals
On Mesoscale
Author(s)
G. Shi & G. Renaud
Abstract
This paper presents research on the development of a simulation method for the
study of the mechanisms of intergranular crack nucleation and propagation in
polycrystal metals on the mesoscale. Microstructural geometry models were
built randomly using Voronoi techniques. Based on these grain structure
geometry models, two-dimensional grain structure finite element models were
created using a Patran Command Language (PCL) program. Techniques for the
implementation of the cohesive elements between grain boundaries were
developed in PCL for the generation of two-dimensional cohesive models.
Simulations on intergranular crack nucleation and evolution along grain
boundaries using two-dimensional finite element cohesive models were carried
out on the mesoscale level. Several aspects that affect the crack nucleation and
propagation were studied, which included random grain geometries, grain
boundary misorientations, grain boundary peak strength, grain boundary fracture
energy, grain properties, and grain plasticity. The simulations demonstrated that
the cohesive model is a useful and efficient modeling tool for the study of the
intergranular crack nucleation and evolution on the mesoscale level. The
simulation results showed that the factors studied have large impacts on
intergranular crack nucleation and evolution based on the current model
capabilities and conditions.
Keywords: intergranular crack nucleation and evolution, cohesive zone model,
polycrystal metals, mesoscale.
Keywords
intergranular crack nucleation and evolution, cohesive zone model,
polycrystal metals, mesoscale
Related Book
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