Shell Elements are now supported for Large Displacement Nonlinear Static Analysis. This is supported for shell elements with PSHELL Property and MAT1 and MATS1 Material entries.

Structural Nonlinear Transient Analysis is now available. It supports Nonlinear Contact, Material, and Geometry. Two time-stepping schemes are currently supported: Generalized Alpha Method (default) and the Backward Euler Method. Structural Nonlinear Transient Analysis is supported only with large displacement theory, therefore, PARAM,LGDISP,1 is required. The NLPARM or TSTEPNL entry can be used in a subcase to provide nonlinear parameters and convergence tolerances. The NLADAPT entries can also be used to define parameters for time-stepping and convergence criteria.

Nonlinear materials (MATS1, MGASK, MATHE bulk data entries) and nonlinear bushing elements (KN option on PBUSH/PBUSH1D bulk data entries) are now supported for Preloading and Buckling analysis.

Node-to-Surface contact (DISCRET=N2S on CONTACT/TIE bulk data entries) with friction is now supported for Preloading analysis.

Certain displacement from preceding nonlinear subcase can be carried over to the subsequent nonlinear subcase. Such displacement is applied as if an enforced displacement is applied in subsequent nonlinear subcase. The D field on the SPC and SPCD entries can be set to F in conjunction with the CNTNLSUB entry to retain the deformed boundary resulting from a preceding nonlinear subcase. .    

CBUSH elements in a large displacement Nonlinear analysis are now resolved using Large Displacement Theory. Previously, CBUSH elements were supported using Small Displacement Theory in Large Displacement Nonlinear analysis.

The SVNONCNV flag on the NLOUT entry to output non-convergent solution for incremental loading results is now available for Large Displacement Nonlinear Analysis.

The Ogden Material Model for Hyperelastic Materials is now available on the MATHE entry. The Model field can be set to OGDEN to activate Ogden Materials on the MATHE Bulk Data Entry.

Neuber stress/strain is available in H3D format by adding the NEUBER keyword on the STRESS/STRAIN I/O Options Entry. Neuber corrected stresses and strains are calculated based on the Von Mises stresses from linear elastic analysis, the Young’s modulus and the nonlinear material property defined on the MATS1 entry.

Contact Interfaces or Elements can be added or removed for different nonlinear static subcases in the model. The parameters for the removal and/or reactivation of Contact Interfaces and/or Elements can be defined on the MODCHG Bulk Data Entry. The TYPE field should be used to choose the entity type (CONTACT/ELMSET) for removal or reactivation. The MODCHG Subcase Entry can be used to reference the MODCHG Bulk Data Entry.

With No Separation option, the contact won’t be open or separate anymore once closed at certain load increments. No Separation can be used together with friction. The SEPARATION flag on the PCONT entry can be set to NO to activate No Separation contact.

Normal and tangential components of Contact Force is available in the H3D file and .cntf file when the CONTF I/O Options entry is defined.

Pretensioning via STATSUB(PRETENS) entry is now supported for Fast Contact Analysis.

Multiple Rigid bodies (RBODY bulk data) can now have the same BID’s. In such cases, the RBODY’s are independent from one another. If multiple RBODY’s are added together with RBADD, the RBODY’s are connected to each other.

Bore deformation calculation (distortion of cylinder in engine) is available. This functionality identifies magnitude of deformation for different orders of distortion of the Bore for each layer based on the displacement on the bore surface using Fast Fourier Transform. The BORED Bulk Data Entry can be used to define the surface, coordinate system, and parameters required to request Bore Deformation output for Static Analysis Subcases.

Plastic strain results are supported for GPSTRAIN output request. The PLASTIC option is available on the GPSTRAIN I/O Options entry to output Plastic Strain (in addition to Total Strain). This is only available for H3D output.

Plastic stress/strain results at Element Corners are available for Shell and Solid Elements in the H3D file. The PLASTIC option in conjunction with the CORNER option is now supported on the STRAIN I/O Options Entry.