CARES ADVANCED FEATURES

• CARES/ANSYS/PDS - Probabilistic Component Life Prediction - Allows the effects of component stochastic variables to be considered in life prediction.

• CARES/WeibPar - For non-standard specimen geometries where closed form solutions do not exist, WeibPar utilizes CARES to calculate the effective volume/area from a finite element model of the specimen. Combined with the failure data parameter estimation, the effective volume/area is subsequently used by WeibPar in calculation of the Weibull material scale parameter.

• CARES/WeibPar - WeibPar additionally utilizes CARES in the calculation of confidence bounds on the component reliability via Monte Carlo bootstrap techniques.

CARES STANDARD FEATURES

• Brittle Material Reliability Analysis
  • Time Independent (Fast Fracture)
  • Time Dependent (Slow Crack Growth)
    • Creep (Static Fatigue)
    • Monotonically Increasing (Dynamic Fatigue)
  • Transient - Time Dependent Reliability (probability of survival) of components subjected to transient (multiple load step) thermomechanical loading

• Finite Element Analysis - Interaction with the FEA Results files includes extraction of Geometry, Temperature and Stress results for the following:
  • Volume elements
  • Surface elements
  • Axisymmetric elements
  • Multiple load steps
  • Psuedo-surface - the free face of Volume elements may be identified and treated as a surface in CARES
  • Stress Space - reliability calculations are performed on either the Principle Stresses or the Full Stress Tensor
  • Symmetrical FE Models

• Material Parameter Settings
  • Direct Input of Time Independent and Time Dependent parameters (for a uniform temperature)
  • CARES Material Parameter File (CMP) exported from WeibPar or manually created
  • CMP Override - this advanced feature is utilized when WeibPar or ANSYS/PDS provide the time independent parameters

• Material Reliability Settings
  • Volume
    • PIA - Principle of Indepent Action
    • Weibull Normal
    • Maximum Tensile Stress - Griffith or Penny shaped cracks
    • Batdorf Coplanar - Griffith or Penny shaped cracks
    • Batdorf Shetty - Griffith or Penny shaped cracks
  • Surface (Area)
    • Principle of Indepent Action (PIA)
    • Weibull Normal
    • Batdorf Coplanar - Griffith or Notch shaped cracks
    • Batdorf Shetty - Griffith, Notch, or Semicircular shaped cracks

• Loading Options
  • Load Factor - increase or decrease the Stresses by this factor
  • Multiple Load step range selection
  • Override a single load step (Time Dependent) applying a g-factor
  • Load Block Repeat for cycling the applied load

• Output Options
  • Print Mode - Input only, Output only, or Both
  • Print Depth - Component, Element, Subelement (Gauss Point), Load step
  • Print Depth may also be controlled by a range for any/all the above
  • Post Processing - ANSYS risk of rupture file

• Help
  • The User Guide and Theory Guide PDF files are available from the Help menu
  • The Error Messages text file is also available from the Help menu
  • Additonal support information links are provided

FINITE ELEMENT MODEL

Elements	2,000,000
Nodes	2,000,000
Load Steps	1,000

The download section details specific upgrades from version to version.

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