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safiredesignengineers
Posts: 581
Registered: ‎06-28-2008
Message 1 of 7 (308 Views)

Stress analysis

308 Views, 6 Replies
12-31-2012 06:47 AM

Hi group

 

I have just started to play with stress analysis and need to ask as question, please see enclosed image.

 

I have drawn up a rod 16mm diameter and i want to see how it might flex with weight on the top, I have applied a load of 25kilos to the top end and fixed the bottom end, it doesn't show up as flexing but it seems to be shorter?

Is this correct?  In the picture you can see the colors of the stress simulation but they seem to be short from the end of the actual rod?

 

Any help on this? Should the rod compress it wouldn't in real life and is this the correct way to see if something will flex in simulation?

 

Regards Adrian

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rhinterhoeller
Posts: 41
Registered: ‎08-07-2002
Message 2 of 7 (292 Views)

Re: Stress analysis

12-31-2012 07:17 AM in reply to: safiredesignengineers

1 - Learn your units.  You have applied Newtons, not 25 kg.  The stress of 0.124 MPa is as expected.

 

2 -  The rod will distort (compress in this situation) under load.  All objects do.  IV magnifies this so that these distortions are more visible.

 

3 - With a rod as slender as that you'll have to consider buckling, in which case this simulation won't work.

 

Richard

IV 2013 Product Design Suite 64 Bit
Win 7 64 bit
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safiredesignengineers
Posts: 581
Registered: ‎06-28-2008
Message 3 of 7 (288 Views)

Re: Stress analysis

12-31-2012 07:42 AM in reply to: rhinterhoeller

Hi Richard

 

thanks for your reply, it is buckling I want to see. I assume the colorless gap at the top is showing a compression of the bar, the bar won't compress like this it will buckle / bend and it is this I want to see / measure.

How would I go about this?

 

regards Adrian

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rhinterhoeller
Posts: 41
Registered: ‎08-07-2002
Message 4 of 7 (273 Views)

Re: Stress analysis

12-31-2012 08:46 AM in reply to: safiredesignengineers

Adrian:

 

I haven't explored to see if stress analysis performs buckling but I doubt it.  Check online help, there's a lot of information there.

 

Richard

IV 2013 Product Design Suite 64 Bit
Win 7 64 bit
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blair
Posts: 3,934
Registered: ‎11-13-2006
Message 5 of 7 (265 Views)

Re: Stress analysis

12-31-2012 12:58 PM in reply to: rhinterhoeller

You won't see buckling in the shipped version of Inventor. The FEA that ships with Inventor only performs Linear Stress Analysis.

Did you find this reply helpful ? If so please use the Accept as Solution or Kudos button below.

IV2015 up1 PDSU / Sim Mech 2015 /
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EVGA X79 - Classified, iCore7 3930k 32Gb Quad-Channel
950Gb (2 x 500Gb Sata III SSD RAID0 Adaptec 6805E Controller)
Nvidia GTX-690 Classified - 335.23
SpacePilot Pro 3.17.7, 6.17., 4.11
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safiredesignengineers
Posts: 581
Registered: ‎06-28-2008
Message 6 of 7 (227 Views)

Re: Stress analysis

01-01-2013 08:52 AM in reply to: blair

Hi Blair

 

thanks for your reply, when you say the shipped version does this mean there is an add on?

 

Do you think this will get into inventor? I have read older posts (2 to 3 years ago) and autodesk saying it will appear in later versions? However it might be that they are unable to add it in?

 

Regards Adrian

*Expert Elite*
blair
Posts: 3,934
Registered: ‎11-13-2006
Message 7 of 7 (223 Views)

Re: Stress analysis

01-01-2013 09:28 AM in reply to: safiredesignengineers

No, you would need to look at separate stand alone software. Simulation Mechanical will do critical buckling load analysis and review the predicted buckling shape.

Did you find this reply helpful ? If so please use the Accept as Solution or Kudos button below.

IV2015 up1 PDSU / Sim Mech 2015 /
Win7-64
EVGA X79 - Classified, iCore7 3930k 32Gb Quad-Channel
950Gb (2 x 500Gb Sata III SSD RAID0 Adaptec 6805E Controller)
Nvidia GTX-690 Classified - 335.23
SpacePilot Pro 3.17.7, 6.17., 4.11

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