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10b v5 Gpsfordesigner Ws 10b 130402

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    WS10b-1

    WORKSHOP 10b

    RECTANGULAR PLATESMALL CONCENTRIC CIRCLE LOAD

    CAT509, Workshop 10b, March 2002

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    WS10b-2CAT509, Workshop 10b, March 2002

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    WS10b-3CAT509, Workshop 10b, March 2002

    WORKSHOP 10b RECTANGULAR PLATE

    Material: Aluminum

    Young Modulus = 29e6 psi

    Poisson Ratio = .3Density = .283 lb_in3

    Yield Strength = 36000 psi

    Design requirements:

    Thickness, t = 0.1 inch

    Radius of contact, ro = 0.1 inch

    Vertical Load, W = 500 lbs

    Problem Description All edges are simply supported.

    Uniform load over small concentric circle applied at the center.

    500 lbs

    .1 inch radius

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    WS10b-4CAT509, Workshop 10b, March 2002

    WORKSHOP 10b RECTANGULAR PLATE

    Hand calculations

    Maximum Bending Stress:

    Maximum Vertical Deflection:

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    WS10b-5CAT509, Workshop 10b, March 2002

    Suggested Exercise Steps

    1. Create a new CATIA analysis document (.CATAnalysis).

    2. Mesh globally with parabolic elements.

    3. Apply an advanced and isostatic restraint (simply supported).

    4. Apply a force.

    5. Compute the initial analysis.

    6. Check global and local precision (animate deformation, adaptive

    boxes and extremas).

    7. Refine the mesh locally with an adaptivity box.

    8. Visualize final results.

    9. Save the analysis document.

    WORKSHOP 10b RECTANGULAR PLATE

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    WS10b-6CAT509, Workshop 10b, March 2002

    Step 1. Create a new CATIA analysis document

    Steps:

    1. Open the existing

    ws10bRectPlate

    .CATPart from the

    training directory.

    2.Apply steel material

    properties to the part as

    required.

    3. Launch theGenerative Structural

    Analysis workbench for

    a Static Analysis.

    4. Specify the

    Computations and

    Results storage

    locations as shown.

    3

    4

    2

    1

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    Step 2. Mesh globally with parabolic elements

    Steps:

    1. Globally mesh as

    shown.

    As plates typically are

    large using one mesh

    element through the

    thickness is a good

    way to start. Then use

    localized adaptive

    meshing for precise

    results.

    1

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    Step 3. Apply an advanced and isostatic restraint

    Steps:

    1. Select the

    Advanced Restraint

    icon, restrain the 4

    bottom edges.

    2. Select isostatic

    restraint icon, select

    OK.

    1

    2

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    Step 4. Apply a force

    1

    3

    Trick of the trade :

    Special construction

    techniques are

    necessary to enable

    you to apply a force to

    patterns that do notexist on parts.

    Steps:

    1. Make your .CATPart

    current and Launch the

    Generative Shape

    Design workbench.

    2. Sketch a 0.2 inchdiameter circle

    centered on top of the

    plate.

    3. Fill this sketch with a

    surface.

    Continue on.

    2

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    Step 4. Apply a force

    2

    1

    3

    Make a solid thickness

    based on the surface.

    Steps:

    1. Go to the Part

    Design Workbench.

    2. Create a thick

    feature 1/2 the plate

    thickness into the part

    and a fraction out of the

    part (0.0001 inch).

    3. Put the Sketch and

    the Fill features in no-

    show then go back tothe analysis

    workbench.

    This method will not

    effect stress levels and

    will work on any shape.

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    Step 4. Apply a force

    Now we have a 0.2

    inch diameter circular

    pattern in a location of

    our choice that is

    selectable.Steps:

    1. Select the Force

    icon and the center

    selectable area. Use

    force magnitude

    values as shown.

    1

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    Step 5. Compute the initial analysis

    Save first.

    Steps:

    1. Compute All

    1

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    Check Deformation,

    and global precision.

    Steps:

    1. Create a

    deformed image and

    animate to verify

    your system deflects

    as expected.

    You should expecteven deformation

    and the sides pulling

    in representing

    simply supported.

    2. Check Global

    precision (looks

    good).

    Step 6. Check global and local precision

    1a

    1b

    2a

    2b

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    Step 6. Check global and local precision

    1

    Find the global

    element with thehighest estimated

    error.

    Find local precision.

    Steps:

    1. Use the Search

    Image Extrema icon.

    2. Local precision isfound using the

    adaptivity box icon.

    Local error looks OK

    but I might prefer 5%.

    2

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    Step 7. Refine the mesh locally

    Refine the mesh to

    achieve 5% precision

    inside the adaptivity

    box.

    Steps:

    1. Locate and size the

    adaptivity box where

    you want refinement,

    as shown. Use a goal

    of 3% error.

    2. Use only one

    convergence.

    1

    1

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    Step 8. Visualize final results

    Steps:

    1. Check local

    precision again.

    2.Activate thedeformation image to

    see the local mesh

    refinement.

    We now have a

    precise model.

    1

    2

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    Step 8. Visualize final results

    Visualize Von Mises

    stress field patterns.

    S 8 Vi li fi l l

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    Step 8. Visualize final results

    Principal Stresses

    Hand calculations =

    80,317 psi

    St 8 Vi li fi l lt

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    Step 8. Visualize final results

    Vertical displacement

    Hand calculations =

    0.003 inches

    St 8 Vi li fi l lt

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    Step 8. Visualize final results

    Hand Calculations .125 inch Parabolic Global Mesh, .013 inch sag

    .06 inch Local Mesh, .006 inch sag

    Global % Precision error

    Local % Precision error

    NA

    NA

    5.7 %

    3.8 %

    Error Estimate NA 4.93e-9 Btu global

    Translational Displacement -0.003 inch -0.00328inch

    Max Von Mises Stress 80317 psi 78900 psi

    Conclusions CATIA V5 GSA workbench is validated for a rectangular

    flat plate with a uniform load over a small concentriccircle scenario.

    St 9 S th l i d t

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    WS10b-21CAT509, Workshop 10b, March 2002

    Step 9. Save the analysis document

    Save your documents

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    WS10b 22CAT509 W k h 10b M h 2002

    WORKSHOP 10

    FOUR EDGES FIXED,TWO EDGES SIMPLY SUPPORTED - TWO EDGE FREE

    THREE EDGES FIXEDTWO EDGES FIXED

    CAT509 W k h 10b M h 2002