Advanced Structural Nonlinearities
Duration: 3 Days
Cost: $1500
Perquisite: Basic Structural Nonlinearities

Newly designed course will 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 which 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.

Course Topics Include:

1. Introduction

• Course Objectives
  
• Course Material
  
• Topics Covered
  
• Appendix A
  
• Material Input
  
• Material GUI
  
  

• 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
  
  

• 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
  
• Rachetting and Shakedown
  
• ANSYS Procedural Considerations for Plasticity
  
  

• 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
  
  

• RATE viscoplasticity option (Perzyna and Peirce)
  
• ANAND viscoplasticity option (Anand’s model)
  
• Solution Procedure for Viscoplastic Models
  
  

• 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
  
  

• 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
  
  

• Drucker-Prager plasticity
  
• Concrete model
  
  

• Background on Structural Stability
  
• Linear (Eigenvalue) Buckling Procedure
  
• Background on Nonlinear Buckling Techniques
  
• Nonlinear Pre-Buckling Procedure
  
• Nonlinear Post-Buckling Procedure
  
  

• 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