Structural Mechanics and Temperature Field Analysis with ANSYS and ANSYS Workbench

Seminar: Bruchmechanische Berechnungsmethoden

The participants learn how to work with the ANSYS Classic or ANSYS Workbench environment (enhanced with a few APDL commands) to set up a typical workflow to solve problems of fracture mechanics.

• Introduction
  • Motivation and definitions
  • Approach to fracture mechanics
  • Continuum mechanics and fracture mechanics
  • Micromechanics and fracture mechanics
  • Classification of fracture mechanics
  • History of fracture mechanics
  • Literature

• Basics of fracture mechanics
  • Theory for ideal brittle bodies
  • Energy release rate
  • Fracture modes
  • Stress intensity factors
  • Crack tip opening displacement
  • J-Integral
  • New methods
  • Literature

• About the proof of fracture safety
  • Workflow in a fracture mechanics analysis
  • Testing of fracture toughness
  • Different fracture criteria
  • Hint to the FKM standard
  • Literature

• Computational modeling using classical methods (FEM)
  • Discretiziation of the crack tip
  • Computation of K-Factors
  • Computation of the energy release rate
  • Computation of the J-integral
  • Literature

• Computational modeling using new methods (FEM)
  • Crack tip opening angle
  • Cohesive zone material models
  • Material models for ductile damage
  • Extended Finite-Element-Method - XFEM
  • Literature

• Discussion of examples
  • Two dimensional elastic crack sensitivity calculation of a straight crack
  • Two dimensional elastic crack sensitivity calculation analysis of an inclined crack
  • Two dimensional elastoplastic crack sensitivity analysis of a straight crack
  • Three dimentional elastic crack sensitivity analysis of a crack with help of the submodel technique
  • Two dimensional crack growth calculation along an adhesive connection
  • Discussion of the Gurson material model to simulate damage effects during yielding
  • First steps about the implementation of X-FEM in ANSYS, no programming details, just results

  

If there is a crack already in a component the question is posed whether this is stable or unstable under the given demand. The later case is the dangerous one. Classical fracture mechanics provides certain workflows in order to examine the sensitivity of a crack. A few new ideas in the field of fracture mechanics are also discussed. For example cohesive zone material models are available which can be used with interface or contact elements to predict the crack growth for a well known direction. With material models from continuum mechanics the user can model damage effects in a material. Considering development the X-FEM method is discussed which is able to describe a crack in a single finite element.