MSC.NASTRAN nonlinear analysis module provides the capability
to analyze structures which exhibit material or geometric
nonlinear behavior.
- Plasticity
- von Mises yield criterion
- Tresca yield criterion
- Mohr-Coulomb yield criterion
- Drucker-Prager yield criterion
- isotropic hardening
- kinematic hardening
- Hyperelasticity for large strain
- Small strain nonlinear elasticity
- Thermo-elasticity
- Viscoelasticity (creep)
- Viscoelasticity combined with plasticity
- Large deformations
- Large strain for hyperelastic material
- Nonlinear buckling
- Snap-through analysis (post-buckling)
- Follower forces
- Nonlinear normal modes
- Structure-structure contact (3D slideline)
- Gaps opening and closing, with and without friction
- Enforced deformations
- Selective BFGS methods
- Selective line search methods
- Adaptive bisection and recovory of load increment
- Load control method
- Displacement control method
- Combined load-displacement control method
(arc-length, Crisfield, Riks, and modified Riks methods) - Adaptive arc-length method
- Adaptive correction for path reversal
- Stiffness updates for unloading
- Adaptive gap
- Adaptive 3D slideline contact
- Same basic model
- Identical element types in linear and nonlinear analysis
- Add only a few nonlinear-specific entries to the linear model
- Input and output formats are similar
- Sparse matrix methods for increased speed and reduced disk space
- Restart from previously-computed solutions
- Adaptive stiffness updates
- Useful and efficient for localized nonlinearities
- Put local nonlinear portion in the residual structure and use upstream superelements for linear portion of the model