By Tom Warren,2014-10-03 09:45
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    Answers 4


    Interactive Version

    Question W41: Review the rigid surface definition. Would the rigid surface

    behave differently if its reference node had been defined 5

    units to the left?

    Answer: No. In this simulation it would not make any difference.

    However, if the rigid body were used in a dynamics simulation

    and were free to move, the rigid body reference node would

    have to be placed at the center of mass. If the rigid body had

    an applied rotation, the reference node would have to be at the

    center of rotation.

    Question W42: Is the separation of the sheet from the rigid surface noted in

    contact diagnostics? (Hint: use the Job Diagnostics tool to

    highlight nodes that separate.)

    Answer: Use the job diagnostics tool to highlight the nodes that open or

    overclose in each SDI, as shown in Figure WA41.

    ? Dassault Systèmes, 2008 Introduction to Abaqus/Standard and Abaqus/Explicit

    WA4.2 2. Select Contact.

    3. Select nodes.

    1. Select an SDI.

     4. Highlight nodes in the viewport.

    Figure WA41 Slave node openings.

    Question W43: Why does the die “penetrate” the deformable sheet? How

    could the model be modified to prevent or minimize this effect? Answer: In a contact pair the slave nodes cannot penetrate the master

    surface, but the master surface can penetrate the slave surface.

    To prevent this, refine the mesh that forms the slave surface. If

    the master surface were deformable, a second contact pair

    could be defined where the roles of the master and slave

    surface are reversed. This technique gives better resolution of

    the contact between the surfaces, but it increases the cost of

    the analysis and makes interpretation of the contact output

    variables difficult.

    ? Dassault Systèmes, 2008 Introduction to Abaqus/Standard and Abaqus/Explicit

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