Whether the local CID rotates with the CBush element

Mariusz Figarski
Mariusz Figarski Altair Community Member
edited April 2021 in Community Q&A

Whether the local CID rotates with the CBush elemen?

Tagged:

Answers

  • paulel_22250
    paulel_22250 New Altair Community Member
    edited April 2021

    For CBUSH, I think not.  I think CBUSH is not geometric non-linear.

    For CBUSH1D, I think yes, IF the coordinate system is a moving system (CORD3R).

     

    From OptiStruct Help for CBUSH1D (with my [ ]s):

    "...If CID > 0, the x-axis of CID is the element axis. In geometric nonlinear analysis, depending on the referenced system being movable [CORD3R] or fixed [e.g., CORD2R], the axis of the element will move or not move with the axes of the system, respectively..."

  • Adriano Koga_20259
    Adriano Koga_20259 New Altair Community Member
    edited April 2021
    paulel_22250 said:

    For CBUSH, I think not.  I think CBUSH is not geometric non-linear.

    For CBUSH1D, I think yes, IF the coordinate system is a moving system (CORD3R).

     

    From OptiStruct Help for CBUSH1D (with my [ ]s):

    "...If CID > 0, the x-axis of CID is the element axis. In geometric nonlinear analysis, depending on the referenced system being movable [CORD3R] or fixed [e.g., CORD2R], the axis of the element will move or not move with the axes of the system, respectively..."

    from the same CBUSH1D documentation, it's said: "Geometric nonlinear analysis is selected by an ANALYSIS = EXPDYN subcase entry."

    From my experience, the usage of this movable coordinate systems are only allowed to EXPDYN loadcases, which essentially converts your model to RADIOSS and perform an Explicit analysis there, allowing a movable frame.

    Unfortunately, i don't think OS currently supports a movable CID itself.

     

     

Categories