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Re: Creo Simulate Fasteners

January 4, 2013, 11:28 am
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Tad,

I was able to get it to run with 3 plates without side loading while adding springs to ground on the center plate to lock down degrees of freedom.  Stress plots from a glance looked ok.  But I did not do hand calcs to verify stresses.  What's missing or needs to be fixed in the software to get it to work with 3 or more plates?
I think this is a big issue for a lot of companies. Example: one would not be able to analyze a bolt going thru a washer and a plate being held to another plate with thru holes?

Thanks for any additional ensight you can provide,
Don

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Re: Creo Simulate Fasteners

January 5, 2013, 9:43 am
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Re: Creo Simulate Fasteners

January 7, 2013, 12:54 am
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Hi,

 

Nearly everything we do has 3 or more components as a bolted assy.

 

Beams, links etc too time consuming (though some estimate of bending is possible)

 

We regularly ignore the rules and 'fool' Mechanica using advanced fastener functionality through more than 2 components; locking down unwanted DOF's with springs.

 

We are careful to ensure loads balance ...

 

In Creo1.0 we found that the contact interface and advanced fastener load tension were unequal (incorrect).

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Re: Creo Simulate Fasteners

January 7, 2013, 8:43 am
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Hello,

I did atest.

3 parton myassembly, I removed the boltsand Ireplacedthescrewson both sidesof the assembly withthe same holeon the center piecefor screwing.

In reality itwould not be possiblewithout shiftingthe holesinopposition.

The calculationisperformedonmechanicathis time, no problem.

All the results areavailable,as well as graphicson the measuresof each screw.

It would be niceto make asimple modelin order tocontrolthehand.

Itwould be interesting tosee, are the bolts or screwsin colors likeparts.

Cordially.

Denis.

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Re: Creo Simulate Fasteners

March 14, 2013, 3:43 am
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Tad,

 

Will we be able to switch off the automatic preload calculation in Creo 3.0?

 

This step becomes redundant once the correct input preload has been determined to compensate for surrounding structural stiffness.

 

We often carry out many studies on a structure once it is bolted up correctly and won't want increased overhead by adding in this step each time.

 

Thanks

 

Charles

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Re: Creo Simulate Fasteners

March 14, 2013, 3:54 am
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Hi,

 

You should lock the intervening part to its neighbour, not ground.

 

Relative movement of bolted components will be small whilst movement relative to ground could be significant and tend to pull the middle component unrealistically (which may also slow up the contact solution).

 

Regards

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Re: Creo Simulate Fasteners

March 14, 2013, 12:10 pm
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Charles,

 

Yes in Creo 3.0, you will be able to switch off the automatic preload calculation. Here's an image of the new dialog. 

 

fastener_def.PNG

The automatic preload correction will occur only if you check "Account for Stiffness".

 

Tad

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Re: Creo Simulate Fasteners

March 15, 2013, 5:11 am
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Tad,

 

Looks good. If a study is run with 'account for stiffness' checked, what feedback is there? Are we told the new fastener input preload required to achieve the desired in the summary file?

 

The annular surface regions created at the interface between the components is currently created whether or not fix separation is requested.

 

I have recurring issues relating to this getting 'confused' with surrounding geometry, particularly when they overlap neighbouring surface/volume regions, rounds, edges of geometry ... manifestations include refusing to mesh, meshing and falling over when searching contacting line segments or worse, running and giving 'interesting' numbers.

 

There are a lot of bolted connections where the local geometry is very close to the fastener hole.

 

If a contact interface is used between the mating components, what is the relevance of this annular surface region? Will we be able to switch this off?

 

Thanks

 

Charles

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Re: Creo Simulate Fasteners

March 29, 2013, 3:54 pm
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0
0

Hi Charles,

 

Which version of Simulate are you using? In Creo Simulate 2.0, I believe the annular surface region is created at the interface only if fix separation is requested.

 

Tad

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↧

Re: Creo Simulate Fasteners

December 20, 2013, 11:00 am
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Lawrence,

 

Does the Fastener Definition window change if you select "Account for Stiffness"?

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Re: Creo Simulate Fasteners

January 4, 2013, 11:28 am
$
0
0

Tad,

I was able to get it to run with 3 plates without side loading while adding springs to ground on the center plate to lock down degrees of freedom.  Stress plots from a glance looked ok.  But I did not do hand calcs to verify stresses.  What's missing or needs to be fixed in the software to get it to work with 3 or more plates?
I think this is a big issue for a lot of companies. Example: one would not be able to analyze a bolt going thru a washer and a plate being held to another plate with thru holes?

Thanks for any additional ensight you can provide,
Don

↧

Re: Creo Simulate Fasteners

January 5, 2013, 9:43 am
↧

Re: Creo Simulate Fasteners

January 7, 2013, 12:54 am
$
0
0

Hi,

 

Nearly everything we do has 3 or more components as a bolted assy.

 

Beams, links etc too time consuming (though some estimate of bending is possible)

 

We regularly ignore the rules and 'fool' Mechanica using advanced fastener functionality through more than 2 components; locking down unwanted DOF's with springs.

 

We are careful to ensure loads balance ...

 

In Creo1.0 we found that the contact interface and advanced fastener load tension were unequal (incorrect).

↧
↧

Re: Creo Simulate Fasteners

January 7, 2013, 8:43 am
$
0
0

Hello,

I did atest.

3 parton myassembly, I removed the boltsand Ireplacedthescrewson both sidesof the assembly withthe same holeon the center piecefor screwing.

In reality itwould not be possiblewithout shiftingthe holesinopposition.

The calculationisperformedonmechanicathis time, no problem.

All the results areavailable,as well as graphicson the measuresof each screw.

It would be niceto make asimple modelin order tocontrolthehand.

Itwould be interesting tosee, are the bolts or screwsin colors likeparts.

Cordially.

Denis.

↧

Re: Creo Simulate Fasteners

March 14, 2013, 3:43 am
$
0
0

Tad,

 

Will we be able to switch off the automatic preload calculation in Creo 3.0?

 

This step becomes redundant once the correct input preload has been determined to compensate for surrounding structural stiffness.

 

We often carry out many studies on a structure once it is bolted up correctly and won't want increased overhead by adding in this step each time.

 

Thanks

 

Charles

↧
Search

Re: Creo Simulate Fasteners

March 14, 2013, 3:54 am
$
0
0

Hi,

 

You should lock the intervening part to its neighbour, not ground.

 

Relative movement of bolted components will be small whilst movement relative to ground could be significant and tend to pull the middle component unrealistically (which may also slow up the contact solution).

 

Regards

↧

Re: Creo Simulate Fasteners

March 14, 2013, 12:10 pm
$
0
0

Charles,

 

Yes in Creo 3.0, you will be able to switch off the automatic preload calculation. Here's an image of the new dialog. 

 

fastener_def.PNG

The automatic preload correction will occur only if you check "Account for Stiffness".

 

Tad

↧
↧

Re: Creo Simulate Fasteners

March 15, 2013, 5:11 am
$
0
0

Tad,

 

Looks good. If a study is run with 'account for stiffness' checked, what feedback is there? Are we told the new fastener input preload required to achieve the desired in the summary file?

 

The annular surface regions created at the interface between the components is currently created whether or not fix separation is requested.

 

I have recurring issues relating to this getting 'confused' with surrounding geometry, particularly when they overlap neighbouring surface/volume regions, rounds, edges of geometry ... manifestations include refusing to mesh, meshing and falling over when searching contacting line segments or worse, running and giving 'interesting' numbers.

 

There are a lot of bolted connections where the local geometry is very close to the fastener hole.

 

If a contact interface is used between the mating components, what is the relevance of this annular surface region? Will we be able to switch this off?

 

Thanks

 

Charles

↧

Re: Creo Simulate Fasteners

March 29, 2013, 3:54 pm
$
0
0

Hi Charles,

 

Which version of Simulate are you using? In Creo Simulate 2.0, I believe the annular surface region is created at the interface only if fix separation is requested.

 

Tad

↧

Re: Creo Simulate Fasteners

December 20, 2013, 11:00 am
$
0
0

Lawrence,

 

Does the Fastener Definition window change if you select "Account for Stiffness"?

↧
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