Analysis Design Productivity Limited

Advanced Structural Nonlinearities.

Course    S_NL3

No. of days    3

Audience

This course is aimed at experienced ANSYS users who wish to focus on element selection and the wide range of constitutive models available in ANSYS. Rate-independent plasticity, viscoplasticity/creep, and hyperelasticity are some of the topics that will be discussed. Geometric instability problems and element birth and death will also be covered. Attendees will learn the appropriate element formulations to use, the input of nonlinear material parameters, and the applicability of the various constitutive models for engineering use. The course is scheduled as a three-day course but it can be taught in two-days if attendees prefer, using the attendee's preference of topics to ensure that important topics are covered first. Contact ADP Ltd to discuss topics that you may want to skip if wanting a two-day course format.

Recommended background knowledge

• Engineering degree or engineering experience.
• Familiarity with ANSYS (Course S_I1 or equivalent experience).
• Familiarity with ANSYS nonlinear capabilities (Course S_NL1 or equivalent experience).

Topics Covered

1. Introduction
• Course Objectives
• Course Material
• Topics Covered
• Appendix A
• Material Input
• Material GUI
2. Element Technology
• Chapter Overview
• Conventional Displacement-Based Continuum Elements
• Shear and Volumetric Locking in Continuum Elements
• Selective Reduced Integration (B-bar)
• Uniform Reduced Integration (URI)
• Enhanced Strain Formulation
• Mixed U-P Formulation
• General Recommendations for Continuum Elements
• Shell Elements
• Beam Elements
3. Advanced Rate-Independent Plasticity
• Background on Rate-Independent Plasticity
• von Mises Yield Criteria
• Anisotropic/Hill Potential (HILL)
• Anisotropic/Generalized Hill Potential (ANISO)
• Voce Nonlinear Isotropic Hardening (NLISO)
• Linear Kinematic Hardening
• Chaboche Nonlinear Kinematic Hardening (CHAB)
• Combined Hardening (CHAB + xISO)
• Cyclic Hardening and Cyclic Softening
• Ratchetting and Shakedown
• ANSYS Procedural Considerations for Plasticity
4. Creep
• Phenomenological Aspects of Creep
• Definition of Terms
• General Creep Equation
• Implicit Creep Procedure
• Explicit Creep Procedure
• ANSYS Solution Procedure for Creep Models
• Comparison of Implicit vs. Explicit Creep
5. Viscoplasticity Background on Viscoplasticity
• RATE viscoplasticity option (Perzyna and Peirce)
• ANAND viscoplasticity option (Anand's model)
• Solution Procedure for Viscoplastic Models
6. Hyperelasticity
• Background on Physics of Rubber
• Background on Hyperelastic Theory
• Particular Forms of the Strain Energy Potential (18x Elements)
• Considerations for HYPERxx Elements
• Solving Hyperelasticity Models
• Material Testing and Curve-Fitting
7. Viscoelasticity
• Background on Viscoelastic Theory
• Rheological Models (Maxwell, Kelvin-Voigt, Standard Linear)
• ANSYS Viscoelastic Model Input
• WLF Shift Function
• TN Shift Function 7-30 Solving Viscoelasticity Models
• Curve-Fitting of Experimental Data
8. Drucker-Prager/Concrete
• Drucker-Prager plasticity
• Concrete model
9. Geometric Instability: Buckling
• Background on Structural Stability
• Linear (Eigenvalue) Buckling Procedure
• Background on Nonlinear Buckling Techniques
• Nonlinear Pre-Buckling Procedure
• Nonlinear Post-Buckling Procedure
10. Element Birth and Death
• Background on Element Birth and Death
• Element Birth and Death Procedure in ANSYS
• Additional Considerations for Birth and Death
• Postprocessing Analyses with Active and Deactivated Elements
Each course chapter is followed by "hands-on" workshops and exercises.

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