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afarmer
Posts: 10
Registered: ‎03-25-2014
Message 1 of 9 (176 Views)

Stress Analysis Help

176 Views, 8 Replies
04-10-2014 08:44 AM

I'm just starting to play around with some of Inventor 2014's stress analysis features and could use a little help. One thing I was having a problem with is applying a force where I want to. I wanted to apply a force to a face but not in the center point, is there any easy way to do this? The best workaround I came up with was creating another very small face with the center where I wanted the force to be applied. The next thing I'm wondering is if there is a way to test what force would cause the part to break. So far I've just been inceasing the force on each simulation until I find a force that's safety factor is close to 1

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JDMather
Posts: 26,342
Registered: ‎04-20-2006
Message 2 of 9 (164 Views)

Re: Stress Analysis Help

04-10-2014 09:16 AM in reply to: afarmer

Use the Split command to split a face.

 (attach your file here if you can't figure it out)

 

 

Inventor FEA does not test if a part will "break".

Safety Factor below one does not mean the part fractures - it simply means the deformation has crossed from elastic to plastic (permanent).

Please mark this response as "Accept as Solution" if it answers your question.
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afarmer
Posts: 10
Registered: ‎03-25-2014
Message 3 of 9 (154 Views)

Re: Stress Analysis Help

04-10-2014 09:39 AM in reply to: JDMather
That makes since but is there a way to find the force that causes the permanent deformation or do I have to run several simulations until I zero in on a force that is close?
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JDMather
Posts: 26,342
Registered: ‎04-20-2006
Message 4 of 9 (147 Views)

Re: Stress Analysis Help

04-10-2014 09:56 AM in reply to: afarmer

It is all relative.

Can you attach your file here?

 

The high stress area could localized to a very small area or location that is of no real concern in the function of the part.

Please mark this response as "Accept as Solution" if it answers your question.
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Active Member
afarmer
Posts: 10
Registered: ‎03-25-2014
Message 5 of 9 (144 Views)

Re: Stress Analysis Help

04-10-2014 09:58 AM in reply to: JDMather

Here is the part. Thanks for the help btw

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JDMather
Posts: 26,342
Registered: ‎04-20-2006
Message 6 of 9 (133 Views)

Re: Stress Analysis Help

04-10-2014 10:29 AM in reply to: afarmer

afarmer wrote:

Here is the part. Thanks for the help btw


An assembly file (*.iam) is only a list of hyperlinks to the part files (*.ipt) and a record of assembly constraints (and a bit more).

You must include the part files.

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Active Member
afarmer
Posts: 10
Registered: ‎03-25-2014
Message 7 of 9 (131 Views)

Re: Stress Analysis Help

04-10-2014 10:31 AM in reply to: JDMather
 
Employee
henderh
Posts: 649
Registered: ‎06-07-2007
Message 8 of 9 (82 Views)

Re: Stress Analysis Help

04-14-2014 11:02 AM in reply to: afarmer

If it's a single force load, you should be able to do this.
(Note: the resulting minimum SF value must be below 15 for this to work. If it's not, increase the load value until it is.)
Once the minimum SF is below 15, multiply that load magnitude by the resulting minimum safety factor.  Use that multiplied value as the load input and it should bring the minimum SF to exactly 1.

 

In your case, you'd multiply the 2500 lbforce * 0.89 (attached).  Use the 2225 lbforce as input.



Hugh Henderson
Simulation QA Engineer
DLS
Active Member
afarmer
Posts: 10
Registered: ‎03-25-2014
Message 9 of 9 (78 Views)

Re: Stress Analysis Help

04-14-2014 11:06 AM in reply to: henderh
Thanks. This is helpful, not 100% what I was hoping for but still a lot better than the guess and check method.

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