Finite element approaches for shear band modelling

The effect of spurious vorticities generated by staggered grid hydrodynamics codes are well known, and many methods have been developed to suppress the hourglass modes which form as a consequence of this framework. Hourglass suppression models commonly work by introducing forces to resist localisati...

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Bibliographic Details
Main Author: Thorington-Jones, Ben
Format: Conference Proceeding
Language:English
Subjects:
Damage assessment
Damage tolerance
Edge dislocations
Localization
Materials failure
Parameterization
Shear bands
Stiffening
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Summary:The effect of spurious vorticities generated by staggered grid hydrodynamics codes are well known, and many methods have been developed to suppress the hourglass modes which form as a consequence of this framework. Hourglass suppression models commonly work by introducing forces to resist localisation. While the risk of artificial stiffening of material associated with these methods is generally deemed to be tolerable with appropriate application, there does not appear to be any body of work specifically focused on the influence of these models, when aiming to assess the localisation process in damage problems. It is possible that while application of generalised hourglass suppression models is appropriate for problems concerning bulk strength, these models should be used cautiously in problems concerning shear banding or fracture. For this investigation, Lagrangian simulations were performed of explosively driven thick-walled cylinder collapse experiments, where shear bands are expected to develop spontaneously. Initial results find that varying the parametrisation of an hourglass suppression model, within the recommended range, has a significant influence on the predicted time to material failure.
ISSN:0094-243X
1551-7616
DOI:10.1063/12.0028746