30-06-2012, 03:38 PM
Getting Started with ANSYS 10
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Performing a Typical ANSYS Analysis
The ANSYS program has many finite element analysis capabilities, ranging from a simple,
linear, static analysis to a complex, nonlinear, transient dynamic analysis. The analysis guide
manuals in the ANSYS documentation set describe specific procedures for performing analyses
for different engineering disciplines.
Building a Model
Building a finite element model requires more of an ANSYS user's time than any other part of
the analysis. First, you specify a jobname and analysis title. Then, you use the PREP7
preprocessor to define the element types, element real constants, material properties, and the
model geometry.
Specifying a Jobname and Analysis Title
This task is not required for an analysis, but is recommended.
Defining the Jobname
The jobname is a name that identifies the ANSYS job. When you define a jobname for an
analysis, the jobname becomes the first part of the name of all files the analysis creates. (The
extension or suffix for these files' names is a file identifier such as .DB.) By using a jobname for
each analysis, you insure that no files are overwritten.
Defining Element Real Constants
Element real constants are properties that depend on the element type, such as cross-sectional
properties of a beam element. For example, real constants for BEAM3, the 2-D beam element,
are area (AREA), moment of inertia (IZZ), height (HEIGHT), shear deflection constant
(SHEARZ), initial strain (ISTRN), and added mass per unit length (ADDMAS). Not all element
types require real constants, and different elements of the same type may have different real
constant values.
Creating the Model Geometry
Once you have defined material properties, the next step in an analysis is generating a finite
element model-nodes and elements-that adequately describes the model geometry.
There are two methods to create the finite element model: solid modeling and direct generation.
With solid modeling, you describe the geometric shape of your model, then instruct the ANSYS
program to automatically mesh the geometry with nodes and elements. You can control the size
and shape of the elements that the program creates. With direct generation, you "manually"
define the location of each node and the connectivity of each element. Several convenience
operations, such as copying patterns of existing nodes and elements, symmetry reflection, etc.
are available.