Hypermesh - Bearing Load

AlfonsoSerrano10
AlfonsoSerrano10 Altair Community Member
in Community Q&A

Hi,

I want to replicate some ANSYS model in HyperMesh. The model contains a hole where a bearing load is applied. In ANSYS software that load is easily applied with a dedicated command. However, I cannot replicate this in HyperMesh.

Bearing loads are applied in the half-surface of a cylinder with a sinusoidal distribution as in this image.

image.png

I found this .tcl script (Bearing Load Creation — Altair Community) where a bearing load is created, but results do not match ANSYS ones. I created a benchmark model in which the bottom surface is a fixed support and a unique bearing load is applied on the hole inner surface with +Z direction. In the attached images the results can be observed. A 38% missmatch is found in stresses, mostly localized in a stress concentrator in the hole. The stress distribution in the component is quite similar

image.png

I believe the differences come from the direction of the applied loads in each node. In ANSYS they are applied all in the same direction (image a) whereas in the HM script this direction changes (image b). However I am not sure about this.

image.png

I would appreciate some advice for creating bearing loads in HyperMesh or any comment about it.

Cheers,

Alfonso

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Answers

  • Gunter
    Gunter
    Altair Employee

    Hello Alfonso,

    Please have look at this article:

    https://community.altair.com/discussion/39370/how-to-apply-bearing-force-which-is-varying-with-cosine-function

    Best regards,
    Gunter

  • AlfonsoSerrano10
    AlfonsoSerrano10 Altair Community Member

    Thanks Gunter,

    But the results applying that method are not near the expected. The method applies a force of magnitude F in each node with the penalisation of cosine distribution. Hence in each node it is applied F*cos(y).

    However, I need to apply a force of magnitude F in total, which means that the summation of each node force is F. In the script from Bearing Load Creation — Altair Community, pressures are used to apply a total force of F.

    Cheers,

    Alfonso

  • Gunter
    Gunter
    Altair Employee

    Hello Alfonso,

    You can update the load direction by selecting a rectangular coordinate system.

    load_direction.png

    Sorry, I don't know a way to apply the total Force magnitude.
    How about a summation of the existing loads, and a LOADADD load collector to scale the loads?

    load_summation.png

    loadadd_scale_factor.png

    Best regards,
    Gunter

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