ansys mechanical postprocessing
TRANSCRIPT
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© 2010 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary
© 2010 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary
Ask-The-ExpertsANSYS Webinar
Advanced Post-
Processing with
ANSYS Mechanical
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Agenda
• Displaying Results – Contour Plots
• Probing Results
– Probing Contour Results
– Probing Reaction Forces, Joints, Bolt Pretension,Beams
• Mapping Results onto Paths
– Existing Geometry
– Construction Geometry (Paths and Surfaces)
• Linearized Results• Beam Results
• Charts – Stress-Strain, Force-Deflection
• User Defined Results
• Coming at ANSYS 13.0
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Contour Plots
• At Release 12.1, users have the following options whiledisplaying contour plots for results like stresses, strains,etc. (not available for DOF results eg: Deformations)
• Unaveraged: Displays unaveraged results.
• Averaged: Displays averaged results. (Default)
• Nodal Difference: Computes the maximum differencebetween the unaveraged computed result (for example, total
heat flux, equivalent stress) for all elements that share a
particular node.
• Nodal Fraction: Computes the ratio of the nodal difference
and the nodal average.
• Elemental Difference: Computes the maximum difference
between the unaveraged computed result (for example, total
heat flux, equivalent stress) for all nodes in an element,
including midside nodes.
• Elemental Fraction: Computes the ratio of the elemental
difference and the elemental average.
• Elemental Mean: Computes the elemental average from the
averaged component results.
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Legends
• Use “Adjust to Visible” to update the legend
to include only “Visible” elements after
slicing a model
Max Stress on Entire Model (232.17Mpa)
and Max. Stress Location
Adjust to Visible After Model
Slicing
New Max. Stress (150.08Mpa) and Max.
Stress Location
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Probing Results
• The Probe Tool allows you to scope a result objectto a location and make that result parametric.
• The Probe Tool can be scoped to geometry, a localcoordinate system or using a remote point.
• The orientation of the result item can be withrespect to global or local coordinate systems.
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• Probe Tool example:
– Local coordinate system defined as shown
– Probe located at local CS
– Stress results (all) requested
Local CS
Probe Location
Probing Results
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• Probe Tools can also be used to extract force reactions at supports and
Joints
Choose Force/Moment Reaction
Force Reactions can be obtained for the
items listed above
For Boundary Condition, all supports usedin the model will be listed
Reaction Forces at boundary condition
Probing Results
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Choose Joint Reaction for Joints
For Bolt Working Loads (Reactions),
Choose Bolt Pretension Select the bolt
Probing Results
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Existing Geometry
• Paths Plots can be obtained on edges
available on the geometry
– Scope the results to the selected edge(s)
– Retrieve the results
Scope Results to Existing Edges
Path Plot of Deformation for SelectedEdge
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Construction Geometry
• Paths can be created using one of threeavailable methods:
– Two points (each point can be a vertex, or apicked one through x,y,z picking on geometry
or directly specified by three coordinates in thedetails window)
– Edge (an existing geometry edge)
–
X axis intersection (using a coord system –specially suited for linearized stress results)
• Surfaces can only be created usingcoordinate systems
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Construction Geometry – Paths
• Examples of creating Construction Geometry using Paths
Path Created Using Coordinate Systems
Path on Existing EdgePath Using Two Vertices
Path Defined by X Axis Intersection
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Construction Geometry – Paths
• Path results may be displayed in graphical form.
• The X axis may be displayed as path location (S) or time(transient analyses).
Path Plot Using Construction Geometry – Notice the Discontinuityin the Path Plot Due to it Passing Through Holes
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Construction Geometry – Paths
• Snap to Mesh Feature : When Solving for linearized stresses, itis important to make sure that the path constructed passesthrough the nodes on the model (not just the geometry). Toensure that the path passes through the mesh:
Set “Show Mesh” to “Yes”
Right Mouse Click – Snap to Mesh Nodes
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Construction Geometry – Surface
• Users can define arbitrary section planes toretrieve results
– Create a local coordinate system
– For the surface:
• For a Cartesian coordinate system, the surface is theintersection of the model with the X-Y plane of thecoordinate system
• For a cylindrical coordinate system, the surface is theintersection of the model with the cylinder whose axis isthe Z axis of the coordinate system. In this case, you
must specify the radius in the Details view of the Surfaceobject
– Add a standard result object
– Set the scoping method to surface
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Construction Geometry – Surface
Create Local Coordinate System
Set the Surface to Reference Local CS
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Construction Geometry – Surface
Preview Surface Location on Geometry
View Results on Surface
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Linearized Results
• The Linearized Stress results calculate membrane, bending, peak, and total stress along a
straight line path in the Mechanical application• To Calculate Linearized Stresses
– Define a Path (Should not Pass Through Holes)
– On the Solution toolbar, click Linearized Stress, and then click the stress you want to calculate
– In the Details view, select the Path you have defined to calculate the linearized stress
– Select the coordinate system you have used for the model
–
Click Solve to calculate linearized stress along the path
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Beam Results
• Results for beams are obtained by using the Beam Tool• The following results are available:
– Direct Stress: The stress component due to the axial load encountered in a beamelement
– Minimum Bending Stress: From any bending loads a bending moment in both the localY and Z directions will arise. This leads to the following four bending stresses: Ybending stress on top/bottom and Z bending stress the top/bottom. Minimum BendingStress is the minimum of these four bending stresses
– Maximum Bending Stress: The maximum of the four bending stresses described underMinimum Bending Stress
– Minimum Combined Stress: The linear combination of the Direct Stress and theMinimum Bending Stress
– Maximum Combined Stress: The linear combination of the Direct Stress and theMaximum Bending Stress
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Charting Results
• Users can create charts using the chart icon
– Graph individual results
– Combine multiple results
Select the Desired Result Item
Clicking on the Chart Icon will Insertthe Result and Generate the Graph
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Charting Results
Force vs. Deflection
Stress vs. Plastic Strain
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User Defined Result
• While in solution, click on the Worksheet Tabto bring up the User Defined Results Sheet
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User Defined Result
• Refer to your ANSYS Workbench Documentationon what the individual results items are:
Element Output for SOLID186 – 20noded Brick Element - ANSYS
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User Defined Result
• Right Mouse Click to insert chosen result as a user
defined item
Enter an Identifier to assign a unique
name to the result
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User Defined Result
• Unique identifiers can be used in equations tocreate other user defined results
Directional X Displacement (from
Worksheet), With Identifier – x_disp
User Defined Result using x_disp
Identifier
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User Defined Results
• Multiple user defined results can also becombined to form other result entities
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Coming at ANSYS 13.0
• New beam results(Shear, Moment, Torque, Force)including shear-moment diagrams
• Native posting for cyclic analysis(expansion to fullpost, traveling waves, etc)
• Peak hold results
• Results scoped to named selections
• Post processing of Euler bodies(Explicit analysis)
• Ability to create paths directly from result probelabels
• “Snap to mesh” ability for result probes
• New result types to support advanced analysisincluding gasket output, creep strains, andstabilization energy
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Coming at ANSYS 13.0
New Results
Step Changes captured
• Beam Shear Moment and Bending Moment
Diagrams