Modeling Geometric Nonlinearity
This section discusses how to model problems where displacements or strains are of a size where the deformation of the structure has to be taken into account when formulating the equations. Examples of the type of problems where this feature is useful include:
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Thin structures, where the deflection is of the same order of magnitude as the thickness.
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Where the structure exhibits large rotations. A rigid body rotation of only a few degrees causes significant strains and stresses in a material where a linear strain representation is used.
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Where the strains are larger than a few percent.
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Contact problems.
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Where a prestress must be taken into account for computing the dynamic response of a structure.
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Buckling
problems.
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Where a deformed mesh is used.
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Fluid-structure interaction problems.
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Contact Modeling
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The Fluid-Structure Interaction Interface
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The more formal theory is described in
Analysis of Deformation
