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GregAnderson1-Visitor
1-Visitor
October 21, 2010
Question

Mechanica Analysis errors out.

  • October 21, 2010
  • 4 replies
  • 6573 views

Capture.PNG

I am trying to do an static analysis on a car frame. Here I took a screen shot of a test run I tried in mechanica. It consists of two tubes meeting at about 70 degrees. You can see the red blob of polynomials about 3/4 of the one up one of the tubes. I recieve an error:

"The model is insufficiently constrained for the analysis. Please review the element connections,
properties, and constraints in highlighted entities. If this is a modal analysis, then you may be
able to obtain a solution by requesting additional modes."

If anyone could tell me where to go from here that would be great. Thanks.

    4 replies

    C
    CHAGS1-Visitor
    1-Visitor
    March 1, 2011

    I usually confront this type of error when the material is not assigned to individual parts in an assembly.

    If it is an asembly, please check if the individual components are assigned with proper material.

    M
    MikeMinsterkett1-Visitor
    1-Visitor
    March 1, 2011

    It sounds like your constraints are not valid. You should check all constraints maybe eliminate some then run to determine where the problem is. You could've specified a load in the wrong direction.

    S
    sergeyzaharzhev1-Visitor
    1-Visitor
    November 1, 2011

    Check material properties for density, Young modulus, Poisson's ratio.

    E
    ErikNilsen1-Visitor
    1-Visitor
    March 8, 2012

    I had the exakt same problem, adding the Young modulus fixed it. I've at this for hours without finding a proper solution until i found your post. Many thanks!

      P
      ptc-57454931-Visitor
      1-Visitor
      May 13, 2014

      Hi,

      I'm a student and not much experienced with creo professionally.

      I have encountered the same problem.

      I have tried changing material properties, material assignment, type of assembly (rigid from user defined) and Still getting this error.

      Can anyone help me at this moment??

      Thank you.

      3
      346gnu13-Aquamarine
      13-Aquamarine
      May 13, 2014

      Hi,

      I am making assumptions as I can't see from the screenshot so this may or may not help ...

      If this is a solid model

      If hese are the only two constraints

      If the constraints are point constraints

      Then the model will spin around the axis formed by the straight line that passes through the points.

      One cannot fully constrain all solid rotations by constraining one or two points.

      Also, and again I can't tell from the screen shot, make sure you haven't constrained you skeleton datum curves rather than the end surfaces. It's the surfaces that are part of the structure.not the datum curves.

      Regards

      Charles

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