Geometry Spike Creation

  • Last Post 09 November 2019
Brennan posted this 07 November 2019

Hi experts,

I was importing a geometry file that opened up perfectly in Space claim when I imported the part. However, when I opened up the model in ANSYS Mechanical, these weird spikes formed on the part. I checked the geometry and they don't seem to be part of any body in the geometry. I imported my files from a STEP that was an assembly in Onshape. 

Are these spikes a problem and is there any way to get rid of them?

Thank you for your time. 

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Brennan posted this 07 November 2019

Also, here is a picture of the way it shows up well in SpaceClaim

rwoolhou posted this 07 November 2019

It'd help if you put the image with the spikes up too: staff are not permitted to open/download attachments. 

peteroznewman posted this 07 November 2019

Try this.

  • Save from OnShape as a Parasolid
  • Start DesignModeler, File > Import External Geometry File, Generate.
  • Open Mechanical.

The reason this might work is because DesignModeler is Parasolid based software, so there would be no translation of the geometry, while SpaceClaim is not Parasolid and during translation, some spikes are created.

Brennan posted this 07 November 2019

So the issue is not that Spaceclaim is creating the spikes. It is that when I open up Mechanical, these spikes come up. The image right above is from Mechanical. But the much prior image is from spaceclaim, where it opened up correctly.  

rwoolhou posted this 07 November 2019

That's a translation issue. You may need to simplify the faces. 

Brennan posted this 09 November 2019

Thank you, I fixed it by getting rid of the threads in my design. They ended up causing the spike creation when the file was translated from Spaceclaim to Mechanical.