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346gnu13-Aquamarine
13-Aquamarine
November 13, 2014
Question

Creo3 fasteners & 'carries shear'

Hi,

Can we switch off a fastener's ability to carry shear?

I want to work out what happens when a dowelled cover slides and I want the worst case - fasteners carry no shear.

Thanks


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5 replies

sdensberger2-Explorer
2-Explorer
November 13, 2014

In the fastener dialog box there is a pull-down called, "Stiffness" where the default is, "Using diameter and material" that can be changed to, "Use spring stiffness property". Selecting this option will allow you to use the properties of an advanced spring, of which you can set Kyy and Kzz to 0 (these are the stiffness components that are orthogonal to the direction of the fastener direction; see the image below). You will, of course, have to determine what stiffness values to use (which are tied to the size and material associated with your bolt). Also make sure that you have "Frictionless Interface" checked if you don't want the faying surfaces to carry any shear.

http://www.ptc.com/cs/help/creo_hc/creo20_hc/pma/simulation_modules/graphics/fastener-stiffness-props.png

Where:

  1. Kxx—extensional stiffness along the axis of the fastener.
  2. Kyy—shearing stiffness
  3. Kzz—shearing stiffness
  4. Txx—torsional stiffness of fastener
  5. Tyy—bending stiffness
  6. Tzz—bending stiffnes
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346gnu13-AquamarineAuthor
13-Aquamarine
November 14, 2014

Thanks Shaun,

I saw this and got my calculator out .... I was looking for the lazy way out similar to a WF4 check box.

Also, this is a spring and not the new beam fastener released with Creo.

In either case (beam or spring) would a nice to have be 'estimate stiffness matrix from model' and present an editable table?

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sdensberger2-Explorer
2-Explorer
November 14, 2014

I saw this and got my calculator out .... I was looking for the lazy way out similar to a WF4 check box.

If I recall correctly, getting a spring element to behave exactly like a beam element isn't simple.

Also, this is a spring and not the new beam fastener released with Creo.

Did they change over from spring elements to beam elements in 3.0 for the fastener tool?

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