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SIMULIA UK RUM 2011 Tortworth Court, South Gloucestershire

Session 5: User Paper Review

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Trelleborg

Rubber Modelling Tips.

If strain gradients and element distortions remain small,

second-order elements are preferred. If strain gradients are

large and element distortions become severe, first-order

elements are recommended.

Hybrid elements must be used for fully incompressible

hyperelasticity.

For nearly incompressible hyperelasticity, hybrid elements may

be needed but are not required. They are strongly

recommended if second-order elements are used. Exception:

C3D10M elements.

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Trelleborg

Rubber Modelling Tips (continued).

Incompatible mode elements work well with hyperelastic

materials up to moderate strains.

o They should not be used in this case for large strains

(> 100%), especially if the material is loaded in compression

Invoke the enhanced hourglass control when first-order,

reduced-integration elements are used.

In mesh generation try to anticipate the distortion in the layout

of the mesh.

Always check the stability range of the material. Add

*PREPRINT,MODEL=YES to get extra information.

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Brunel University

General Contact.

Allows you to define contact

between many or all regions of a

model with a single interaction.

The method is geared toward

models with multiple components

and complex topology

Greater ease in defining contact

model compared to contact pairs.

Available in both

Abaqus/Standard and

Abaqus/Explicit

One contact domain in general contact

Multiple contact pairs required

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Brunel University

Surface to volumetric meshing

in Abaqus/CAE

Convert triangular shell mesh to

tetrahedral mesh.

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Anglia Ruskin University

Nonlinear Penalty-Based Contact.

Advantages: o Improved convergence rates

o Better equation solver performance

o Good treatment of overlapping

constraints

Disadvantages: o Small amount of penetration

o May need to adjust penalty

stiffness relative to default

setting in some cases

Comparison of linear and nonlinear

pressure-overclosure relationships

with default settings

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Anglia Ruskin University

Life Sciences: Simulia

Publications and Resources.

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SIMULIA UK RUM 2011 Tortworth Court, South Gloucestershire

Question and Answer Forum