Inventor General

Reply
Member
dominguesj
Posts: 4
Registered: ‎05-11-2012
Message 1 of 11 (5,169 Views)
Accepted Solution

Stress Analysis Add-In missing in INVENTOR 2013 Pemium

5169 Views, 10 Replies
05-11-2012 12:59 AM

Hello,

 

I jost installed Inventor 2013 Premium  (PRODUCT DESIGN SUITE) here at the company and I have noticed that there is no "Stress Analysis" button in the Environments Tab. I already checked the "manage Add-Ins" button and there is no Stress Analysis module available in the list of Add-Ins.

 

Am I reading this wrong or this version may not have a Finite Element Analysis module?

 

It is strange because in the brochure there is a stress analysis module. Also, in the Environments tab there is an "Optimization" button. What is the purpose of having optimization without having Stress Analysis?

 

Could this be a bug?

 

Thank you in advance for the help!

 

 

*Expert Elite*
sam_m
Posts: 594
Registered: ‎11-05-2003
Message 2 of 11 (5,164 Views)

Re: Stress Analysis Add-In missing in INVENTOR 2013 Pemium

05-11-2012 01:34 AM in reply to: dominguesj

Unless it's changed for 2013 release you need Inventor Pro for stress analysis and you need Product Design Suite Ultimate for Inventor Pro...

 

http://usa.autodesk.com/adsk/servlet/pc/index?siteID=123112&id=16491076  

^ With your Product Design Suite Premium 2013 you have Inventor (with Routed Systems) but not Inventor Pro.

----------
Please mark this response as "Accept as Solution" if it answers your question...
but please understand that the solution may not be the answer you're wanting to hear...

If you have found any post to be helpful, even if it's not a direct solution, then please provide that author kudos - spread that love :smileyvery-happy:

Lithium - helping nntp users with mania, depression and headaches
Member
dominguesj
Posts: 4
Registered: ‎05-11-2012
Message 3 of 11 (5,158 Views)

Re: Stress Analysis Add-In missing in INVENTOR 2013 Pemium

05-11-2012 01:40 AM in reply to: sam_m

I think you are correct. It is a pitty that this version does not have FEA as well.

I hope it becomes a standard package in the future for all versions.

 

Thank you!:smileyhappy:

*Pro
jletcher
Posts: 1,946
Registered: ‎05-18-2011
Message 4 of 11 (5,135 Views)

Re: Stress Analysis Add-In missing in INVENTOR 2013 Pemium

05-11-2012 06:30 AM in reply to: dominguesj

lol thats funny. I know the talk when Inventor came out that it was going to be all in one package thats what they sold it on. Because Pro-E you bought Mods so when inventor came out thats what they told everyone that Inventor will be an all in one package no mods..

 

Oh and one package not what they have now like 5

 

GREED


Please mark this response as "Accept as Solution" if it answers your question.

James Letcher
2012 Factory Design Suite ( will not load 2013)
What happen to my Inventor :-(
Member
dominguesj
Posts: 4
Registered: ‎05-11-2012
Message 5 of 11 (5,126 Views)

Re: Stress Analysis Add-In missing in INVENTOR 2013 Pemium

05-11-2012 07:33 AM in reply to: dominguesj

Agreed.

 

I myself am a fan of simple software. Have it all in one place, and make it efficient, that's my style.

 

I have just recently started working in Inventor. It was amazing to see how many different programs are available to install from this package alone (Inventor, 3DS Max Design, etc, etc...). Honestly, I do not care about any of the other software packages... but not having FEA as a standard Add-In? Nowadays, FEA has become so useful that selling a mechanical CAD program that does not include it is like selling a car without the engine.

 

Member
hansknec
Posts: 3
Registered: ‎05-03-2012
Message 6 of 11 (4,978 Views)

Re: Stress Analysis Add-In missing in INVENTOR 2013 Pemium

06-07-2012 01:57 PM in reply to: sam_m

Forgive me if this seems incoherent, because I am on some medication, but I found that since I am on subscription, I have autodesk 360 cloud services available.  When you read the services listed, the Inventor Optimization is listed as a feature that is accessible from the Autodesk Product Design Suite Premium 2013.  Note:  This is not an Autodesk Inventor Pro install, only normal Autodesk Inventor.

 

So,  today I went to the cloud service and activated my optimization function by downloading a file that is supposedly for Inventor 2012.  Sure enough, I can now go to the Environments tab and click on Optimization, apply the loads, pins, parameters, etc and once everything is entered, the "optimize" button appears.  When I press the button it sends it to the cloud and after a few minutes the cloud returns the result. 

 

Now, I'm stuck trying to figure out exactly what I am seeing.  I simulated a simple flange on a pressure vessel that will have 20psi inside.  I expected to see parameters of flange displacement and such as pressure is applied, but it only wants to optimize for flange weight by changing the flange thickness.  My result show max 15ul and min 2.95 ul.  What is that?  It's saying it is a "safety factor".  Does this mean safety before flexing? Before catastrophic failure? What?

 

When I watch the movie of my 3/4" thick 20" diameter steel flange in the simulation, it appears to be flexing 3 or 4 inches outward as the pressure is applied.  Is it just exaggerating the motions?  pictures attached.

 

Is the optimization worth anything without having access to all the FEA elements?

 

Perhaps it is obvious by my post, but I am not a mechanical engineer.  I just like to play with this stuff.

Member
hansknec
Posts: 3
Registered: ‎05-03-2012
Message 7 of 11 (4,973 Views)

Re: Stress Analysis Add-In missing in INVENTOR 2013 Pemium

06-07-2012 02:04 PM in reply to: hansknec

To avoid any confusion from my previous post, the pressure vessel is to the left of the flange providing 20psi force,  The chamber to the right is another chamber that serves as the pinning flange, so flexture toward the right is expected in the result.  I'm simply confused by the nomenclature of "safety factor" in "ul" units.

Employee
henderh
Posts: 649
Registered: ‎06-07-2007
Message 8 of 11 (4,967 Views)

Re: Stress Analysis Add-In missing in INVENTOR 2013 Pemium

06-07-2012 03:48 PM in reply to: hansknec

Hi hansknec,

 

  What you are describing is the as-designed behavior of Optimization for Inventor.

 

1)  Specify the load and boundary conditions 

2)  Nominate model parameters to investigate how varying these will affect the stress induced (i.e. Safety Factor) with the same loading conditions

3)  In the settings, the target Safety Factor can be specified, along with coarse or refined type (this is a convergence setting equivalent to changing maximum number of h-refinements to 3 in Stress Analysis)

4)  The configurations will be solved in the cloud, and the 'optimum' configuration is returned with satisfies both the minimum SF requirement, while choosing the best size to minize the mass of the structure (hence saving material, cost, etc.)

 

  The safety factor is just a different way of expressing the Von Mises (Equivalent) stress by dividing the material's yield strength, by the stress value.  For example, if the yield strength is 250 MPa, and the maximum VM stress is 125 MPa, the corresponding SF would be 250/125 = 2.

 

  If you are dealing with brittle materials, the Ultimate Tensile strength should be chosen as the SF criteria (in the Assign Materials dialog) since brittle materials have basically the same Yield and Fracture stress and safety factor is a bit more involved since we will take the principal stresses into accout instead of just maximum Von Mises as we do for yield strength.

 

  The simulation can be exported from OfI to Stress Analysis for futher investigation where the loads and constraints will remain in-tact as well as the Simulation setup which is equivalent to the parametric dimension design objective simulation type that has the appropriate mass and SF design constraints defined.

 

  R2013 also has the addition of the new DKT shell element type.  If you are conducting a pressure vessel simulation, shell elements would be particularly suited for those 'thin body' types of geometry.

 

Hope this helps!   As always, please let us know if you have any additional questions, comments of suggestions.

 

Best regards, -Hugh

 

[Edit: fixed type of 'teh']



Hugh Henderson
Simulation QA Engineer
DLS
Member
dominguesj
Posts: 4
Registered: ‎05-11-2012
Message 9 of 11 (4,949 Views)

Re: Stress Analysis Add-In missing in INVENTOR 2013 Pemium

06-08-2012 12:28 AM in reply to: dominguesj

"Is the optimization worth anything without having access to all the FEA elements?"

 

I have a preference for having access to all FEA elements first, check the results for the simulations, and only then do I procede to optimization (if required).

 

"I'm simply confused by the nomenclature of "safety factor" in "ul" units."

 

Well, in Inventor "ul" means "uniteless", and this is being shown because the safety factor has no units.

 

You can google it to find out more about what "safety factor" is.

Just to give you a quick answer, lets just say that in engineering there are a lot of unknows and things that are hard for the engineer to predict.

So, if we are designing a component to handle a certain load, we design it to be twice as strong, and some times more, to account for all the umpredictable factors.

 

So, the higher the safety factor is, the better.

 

 

Member
hansknec
Posts: 3
Registered: ‎05-03-2012
Message 10 of 11 (4,946 Views)

Re: Stress Analysis Add-In missing in INVENTOR 2013 Pemium

06-08-2012 06:07 AM in reply to: henderh

Thank you all for your responses.  It is mostly clear now but I have a couple more questions.

 

You say I can export my results to stress analysis for further investigation?  Is this true in my case where I only have Autodesk Inventor with cloud services, but not Autodesk Inventor Pro?  I can hit the export button, but I seem to have no other button to open the actual stress environment.  I have also not found the DKT shell element you speak of.  Is this also only in Pro?

 

So here I had the 1" thick steel 20" flange and I "optimized" thickness for 20psi load.  I would have expected the program to say "hey, this is crazy, you can reduce the thickness to 1/4" and achieve a 3X safety margin.  Instead, it only changes the width by a small amount and comes back and tells me that the best result is 0.85" thick and it has a 12X safety margin.  What did I setup wrong?  Is this simply not powerful enough unless I invest in Inventor Pro?

You are not logged in.

Log into access your profile, ask and answer questions, share ideas and more. Haven't signed up yet? Register

Announcements
Are you familiar with the Autodesk Expert Elites? The Expert Elite program is made up of customers that help other customers by sharing knowledge and exemplifying an engaging style of collaboration. To learn more, please visit our Expert Elite website.

Need installation help?

Start with some of our most frequented solutions to get help installing your software.

Ask the Community


Inventor Exchange Apps

Created by the community for the community, Autodesk Exchange Apps for Autodesk Inventor helps you achieve greater speed, accuracy, and automation from concept to manufacturing.

Connect with Inventor

Twitter

Facebook

Blogs

Pinterest

Youtube