Overview
Under Development
The new remeshing capability in Zencrack 9.0-1 was an initial implementation onto which more capability has been added with the latest releases, 9.3-1 and 9.4-1, having the ability to cater for multiple remeshing cracks and merging of remeshed regions respectively.
Work continues to enhance the remeshing capabilities with the interface to Simcenter Nastran being upgraded to included support for remeshing.
The multi-crack remeshing capability in 9.3-1 included a limitation that the remeshing regions of the cracks do not touch or overlap. Removing this limitation was the main development activity for version 9.4-1 and a pre-cursor to further generalising the remeshing capability for multiple cracks in subsequent releases (for example, allowing an initial elliptic geometric definition to cut multiple crack fronts into a model). An example of an enhancement in the now-released version 9.4-1, in which two cracks whose remesh regions are initially separate become embedded in a single remesh region after some growth has taken place, is shown below.
Multiple crack fronts on the same crack plane
Example of an initial geometric ellipse cutting one crack plane and two crack fronts into a model to generate an initial 45 degree inclined crack
Preview of the initial crack front rings and region to be remeshed (Zencrack GUI)
Displaced plot of advanced crack positions during growth prediction (Abaqus/Viewer)
Remeshing with the Simcenter Nastran interface
Example of post-processing in Simcenter 3D Results Viewer using a step from a Zencrack crack growth run carried out with Simcenter Nastran
Remeshing with improved crack plane triangulation during a growth analysis
Retriangulation of the initial crack plane (i.e. at step 1 of the analysis) is now carried into subsequent steps
Crack plane triangulation at analysis step 8 without the new retriangulation option
Crack plane triangulation at analysis step 8 with the new retriangulation option
A non-linear Kujawski-Ellyin crack growth law will be implemented as per the publication:
- Non-linear models for assessing the fatigue crack behaviour under cyclic biaxial loading in a cruciform specimen
M.Lepore, F.Berto, D.Kujawski
Theoretical and Applied Fracture Mechanics, Volume 100, 14-26, April 2019, DOI: 10.1016/j.tafmec.2018.12.008.
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