Ansys Mechanical PostProcessing

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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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    © 2010 ANSYS, Inc. All rights reserved. 2  ANSYS, Inc. Proprietary

    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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    © 2010 ANSYS, Inc. All rights reserved. 3  ANSYS, Inc. Proprietary

    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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    © 2010 ANSYS, Inc. All rights reserved. 4  ANSYS, Inc. Proprietary

    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