Download Getting Started with Abaqus: Keywords Edition

SUMMARY
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Abaqus/Explicit does not smooth rigid surfaces; they are faceted like the underlying elements.
Coarse meshing of discrete rigid surfaces can produce noisy solutions with the contact pair
algorithm. The general contact algorithm does include some numerical rounding of features.
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Tie constraints are a useful means of mesh refinement in Abaqus.
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In subsequent steps any nodal adjustments to remove initial overclosures in Abaqus/Explicit induce
strains that can potentially cause severe mesh distortions.
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When you are interested in results that are likely to contain high frequency oscillations, such as
accelerations in an impact problem, request Abaqus/Explicit history output with a relatively high
output rate and (if the output rate is less than every increment) apply an anti-aliasing filter; then, use
a postprocessing filter if stronger filtering is desired.
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The Abaqus Analysis User’s Manual contains more detailed discussions of contact modeling in
Abaqus. “Contact interaction analysis: overview,” Section 32.1.1 of the Abaqus Analysis User’s
Manual, is a good place to begin further reading on the subject.
Abaqus/Explicit adjusts the nodal coordinates without strain to remove any initial overclosures prior
to the first step. If the adjustments are large with respect to the element dimensions, elements can
become severely distorted.
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