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a7-pipe-whip-ia

By Rosa Nichols,2014-10-05 07:13
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a7-pipe-whip-ia

    Answers 7

    Contact with Abaqus/Explicit

    Interactive Version

    Question W71: Why is density required in the material model definition? Can

    you comment on the units of density used in this problem? Answer: All Abaqus/Explicit analyses require a density value because

    Abaqus/Explicit solves for dynamic equilibrium (i.e., inertia

    effects are considered). The units for all material parameters

    must be consistent; in this problem, the English system is used

    with pounds and inches as the units for force and length, 24respectively. Thus, the consistent unit for density is lb-sec/in.

    Question W72: Why are only three integration points used through the

    thickness?

    Answer: Three section points are used to reduce the run time of the job.

    Question W73: In order to drive both the translations and rotations of the pipe

    edge nodes, what type of node set needs to be used in the rigid

    body constraint?

    Answer: A tie node set needs to be used.

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

    WA7.2

    Question W74: Could you define contact in the same way if this problem were

    being solved in Abaqus/Standard?

    Answer: No. In Abaqus/Standard, contact must be specified for each

    pair of surfaces that come into contact. Presently there is no

    general contact option in Abaqus/Standard.

    Question W75: How can you use the coordinates of the reference point to

    define the axis of rotation?

    Answer: The axis passes through the reference point and is parallel to

    the 3-direction. Thus, define the axis using two points. Each of

    the “axis” points must have the same 1- and 2-coordinates as

    the reference point; the values of the 3-coordinates of the

    “axis” points will dictate the sense of positive rotation.

    Question W76: What keyword was added to the input file when you created

    the angular velocity predefined field? Search the Abaqus

    Keywords Manual and read the documentation on this

    keyword.

    Answer: Abaqus/CAE adds the keyword *INITIAL CONDITIONS,

    TYPE=ROTATING VELOCITY, which imposes a rigid body

    type initial rotation on the chosen geometry about a defined

    axis.

    Question W77: Would the results of this analysis differ if both halves of the

    pipe were modeled instead of using symmetry boundary

    conditions?

    Answer: As long as the model of the pipe whip (including loads,

    boundary conditions, and mesh) is symmetric about the

    symmetry plane defined, the results from the full model and

    the halved model will not differ.

Question W78: What do the energy history plots indicate?

    Answer: Near the end of the simulation, the impacting pipe is

    beginning to rebound, having dissipated the majority of its

    kinetic energy by inelastic deformation in the crushed zone.

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

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