Static Analysis with Large Deformation Overview
Description
Use static analysis with large deformation to calculate results with geometric nonlinearity. You may want to perform a linear static analysis first to determine whether geometrically nonlinear results are required.
You may also want to perform a linear buckling analysis. If the load factor is greater than the critical buckling load factor for your model, the static analysis with large deformation may either take a long time to converge, or may not converge to a solution. If you perform a buckling analysis that indicates your model will buckle, you can reduce run time for a static analysis with large deformation by using a load that is less than the linear buckling load. If you need to apply a load that is greater than the linear buckling load, then you should select the Include Snap-through check box, which helps the analysis to converge to a solution.
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Creo Simulate supports only certain types of loads, idealizations and connections in large deformation static analysis. Some loads may be deformation-dependent, such as pressure loads.
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Creo Simulate supports linear elastic, elastoplastic, and hyperelastic materials for large deformation analysis.
When using linear elastic materials for a static analysis with large deformation, Creo Simulate interprets material properties according to a natural generalization of linear elasticity. 
and 
are converted to the Lame constants 
and 
, using the same formulas as used in linear elasticity. Stresses are calculated using the Neo-Hookean material law, which depends linearly on and . For more information on Neo-Hookean material, see Nonlinear Continuum Mechanics for Finite Element Analysis, Javier Bonet and Richard D. Wood (Cambridge University Press: 1997).
and are converted to the Lame constants and , using the same formulas as used in linear elasticity. Stresses are calculated using the Neo-Hookean material law, which depends linearly on and . For more information on Neo-Hookean material, see Nonlinear Continuum Mechanics for Finite Element Analysis, Javier Bonet and Richard D. Wood (Cambridge University Press: 1997).For a static analysis with large deformation Creo Simulate reports Cauchy or true stress measures.
For a bar in uniaxial tension, Cauchy stress 
is:
is: = F/A, where F is the force and A is the current (not original) area.Creo Simulate reports logarithmic engineering strain for static analyses with large deformation. Resultant measures are not currently available for this analysis type.
When you run a static analysis with large deformation, you can use the Single-Pass Adaptive convergence method or perform a Quick Check. After you run the analysis, with full results selected for multiple load steps, you can view the results at the various load steps by animating the fringe plot.
Requirements for a Static Analysis with Large Deformation
• 1 or more constraint set
• 0 or 1 or more load set
• a 3D, 2D plane stress, 2D axisymmetric or 2D plane strain model
• solid and mass elements only
• isotropic material properties only
See Constraint and Load Sets in Structural Analyses for more information.