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The ProFES Application allows you to perform
advanced probabilistic analysis on existing deterministic models
without being an expert in probabilistic mechanics. Currently you
can import ANSYS ‘db’ files, archives or parametric models. You can
also import NASTRAN bulk data files or PATRAN session files. You
then describe the uncertainty in loads, material properties, element
properties, and boundary conditions using random variables and
describe the failure criteria for your model using Limit-states. If
you import PATRAN session files which load Unigraphics geometry
parts, you can also describe the uncertainty in geometry (by
changing the Unigraphics features) in addition to describing
uncertainties in loads, boundary conditions, and material
properties. ProFES calculates the reliability of the component.
The ProFES GUI provides many paths for you to
edit the current probabilistic problem. The ProFES GUI guides you
through the process of specifying what variables are uncertain and
specifying the failure criteria or limit-state function.
Once the problem is defined you can perform an
analysis selecting from Monte Carlo Simulation, First Order-Second
Moment Analysis (FOSM) or First Order Reliability Method (FORM).
Results of the analysis can be viewed in many different formats,
including cumulative distribution curves, histograms and sensitivity
summaries.
All random quantities are created through similar
dialog boxes. Any finite element response quantities (displacements,
stresses, etc.) or your own response quantity can be used in the
limit-state functions. Graphic and report style results are
generated for each probabilistic analysis. All previous analyses can
be stored and reloaded.
ProFES can be used independently of FEM codes. You can use the
internal equation parser to type equations that define response
variables. Equations are entered in a simple syntax. ProFES parses
and compiles your equation for execution as probabilistic analysis
is run. You can also call existing executable code using the
external function response type. Internal and external function can
be used with FEM analysis to model fatigue, fracture or other post
processing analysis.
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ProFES control window
The figure shows the ProFES application
with a solid beam model (HEX8 elements) imported. The load on
the beam has been selected to be random. The user has assigned a
12% coefficient of variation to the value of the load.
The ProFES user interface provides a
consistent and robust environment for creating and editing
probabilistic models from your existing finite element models.
For example, shown below is the Material Properties dialog box.
The materials and material parameters are read from the original
finite element model. No additional input is necessary.
Selecting a parameter and clicking the Add button makes this
quantity a random variable.
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