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Application Areas
- Life
Prediction
- Damage
Tolerance Assessment
- Multiple
Site Damage
- Residual
Strength Prediction
- Structural
Integrity Assessment
Benefits
- Accurate
Prediction of Product Life
- Precise
and Powerful Prediction of Stress Intensity Factors
- Damage
Tolerance Prediction
- Accurate
prediction of the propagation path and corresponding
stress intensity factors for arbitrary structures
- Rapid
assessment of crack growth retardation strategies
and product life
Fully Automatic Crack Growth
Prediction
- Fatigue
Crack Growth
- Automatic
crack growth prediction
- Modelling
of multiple cracks including crack branching and
merging
- Fully
interfaced to NASA/ESA fatigue database of material
constants
Fast and Accurate Prediction
of Crack
Growth Data
- Automatic
remeshing to insert cracks
- Automatic
remeshing as cracks grow
Fatigue & Crack Growth
Features
Materials Database
- NASA/ESA
fatigue database
- Over
360 materials are represented
- Users
can define their own material properties
Fatigue Crack Growth Criteria
- Generalised
form used in NASGRO
- Paris,
Rhodes, Forman etc
- Tabulated
da/dN
- Retardation
Crack Growth Direction Criteria
- Maximum
Principal Stress (2D only)
- Minimum
Strain Energy Density
Stress Intensity Factor Computation
- Modes
I, II and III S.I.F. computed
- J-Integral
(2D only)
- Crack
opening displacement
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Crack Modelling
- Single
or Multiple cracks
- Embedded
or Edge cracks
- Straight,
Kinked or Curved crack fronts
- Crack
modelled using dual boundary elements
Fatigue Crack Growth
Results
- Stress
Intensity Factors
- Crack
and model deformation
- Crack
and model stress field
- Crack
propagation path
- Crack
growth rate
- Residual
strength
Element Library
- Complete
range of elements including both discontinuous
and continuous elements
- Hierarchical
element types allow model refinement without
change of mesh
- For
three dimensional problems, quadrilaterals
and triangles
- For
two dimensional and axisymmetric problems,
lines
- All
elements have high order shape functions
for accurate model representation
Analysis Features
- Comprehensive
checking of data and of computer resources
required ensures that no analysis runs are
wasted
- Local
error guides to give clear indication of
solution accuracy
- Evaluation
of total force balance
- Efficient
and economical solution at as many user-specified “internal
points” as required
- Step-by-step
analysis option allows re-analysis to be
carried out after minor changes without recalculation
of matrices
Zoning or Substructuring
A model
can be split into any number of zones
or substructures to represent different
components or materials or to simplify
the model.
Interface
conditions between zones include:-
- Sliding
- Interface
stiffness coefficients
- Prescribed
added traction
- Contact
or gap
- Press
fit
Boundary Conditions and
Loading
- Point
and line loads
- Traction
- Displacement
- Support
Stiffness
- Thermal
Loading
- Centrifugal
loading*
- Acceleration
(including gravity) in any direction
Geometry Features
- Implicit
symmetry about any axis
- General
zoning and substructuring
Material Properties
- Isotropic,
linear elastic for 3D, 2D and axisymmetric
- Isotropic,
orthotropic* and anisotropic* linear elastic
for 2D
*
Not applicable to dual elements
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PDF Version
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