66 Replies Latest reply on Sep 13, 2018 10:32 AM by Matt Peneguy

# URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Hi to all, I am really in trouble of finalizing the meshing process of the file that I uploaded below. Please, can someone obtain the simulation analysis (finalize the meshing process) of the below's chair project??? I need it urgently, as I have my graduation exam on 13th :(. The reason about why I can not finalize that process is because the program tells me that 'two or more components are interfering....' and etc.. Please, if someone can try to help me- I will very happy..

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

I know someone who would be happy to complete your school assignment.  That would be Rick Becker

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Oh, really? How can I reach him?

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Hey pal.....hey Rick!....Rick Becker here a buddy need a little help...........

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Yes, thanks Ruben . I think that the design is so simple- it won't take so much time to do that analysis....but...a more experienced than me person can help me I guess.

I really hope that Rick will be able to see my message.

THANKS AGAIN TO WAYNE AND RUBEN.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

..we need some Rick music !

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

First, Wayne Schafer is pulling your leg.

Second, personally I refuse to download zip files from people I don't know so I can't look at your model.  (Try pack and go.)

Third, if this is an assembly, check for interferences in the model and correct them.  If it is supposed to be one piece and is all the same material you could try merging the individual bodies.

(Glenn Schroeder might direct you to the FAQs.  That's a joke.  )

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

James, thanks to you too for trying to help me . However, I tried a lot of ways to refix the model. It is so precise (in terms of dimensional tolerances). I am so confused...

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Is it multiple parts (an assembly) or only one part?

If it is only one part and only one material then merge (join) all the volumes with each other.  I recall that you might have to do one pair of volumes at a time.

Have you tried the mesh option to ignore interferences?

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

James, yes it is an assembly of multiple parts (but there are not many pieces actually). What do you mean exactly by trying the mesh option to ignore interferences?

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

I guess that I have not tried this option. But I have not seen this tool of mesh option to ignore interferences

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

I am pleased to hear of your wonderful new Finite Element Analysis project.

I believe my firm, Dewdrop, Cheatem & Hold'mUp, ltd, inc., can help you. Either me, or one of my Top Rated Associates, will be pleased to come to your site, and analyze your elements finitely.

As you know, the analysis of our parts are priceless. A price cannot be put on the accurate and correct analysis of your part. We have the most advanced tools and methods possible to help you.

Just send me First Class Airfare to your destination. Arrange for ground transportation (Limo with bar service) along with accommodations at the closest 4-Star hotel. A small daily stipend will be required for food and necessary accouterments. Tipping is not required, but is greatly appreciated.

Hope to see you soon.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Oh yes the Rick I know and love

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Wayne Schafer wrote:

Oh yes the Rick I know and love

Careful! we don't want any strange goings on around here.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Hi Rick, sorry I really could not get the last paragraph of your text :/

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Nevermind Rick Becker, I think the stress analysis is already done.  See the attached picture.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

James Riddell wrote:

Nevermind Rick Becker, I think the stress analysis is already done. See the attached picture.

I'm guessing 400 lbs was too much?

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

182Kg? Wow....a man his wife and grand Danish sit at same chair?

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Now that Rick has offered to do your homework for you, you have one option.  Another option is to make an attempt yourself and post what you are doing and why with screenshots.  You aren't going to receive constructive help on this forum by asking people to do your homework for you.  But, some really great help is available here for those that give it an attempt themselves... (Hint, add your constraints and loads and post them here for someone with some finite element experience to look at.)

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Musto,

James gave you some really good advice above but you apparently blew right past it in your hurry for an answer. So I will attempt to help.

First, we will not do your school project for you. however if you will use the pack and go function within SolidWorks and then attach the assembly file here someone will probably be willing to look at it and see where your error is. Then that person will give you suggestions on how to solve your own problem. That way you will actually learn what your problem is and how to resolve your issues. I know, novel concept for a school project, but that's the way we are.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Jim, I have made the pack and go function. Here is the folder

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Of course, I need the community to help me. I am a Design and Engineering student and we deal mostly with the DESIGN PART OF THE WORKS.

I attached the pack and go file here. Have not you seen that? I am doing the pack and go option for the first time, if you saw that I made a mistake please tell me

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

dude, info and good research should be second nature

for you

chill a bit- there's a reason why title subjects are not

ALL IN CAPS

look about the forum- just for starters try-

https://forum.solidworks.com/message/736083

give yourself a chance to get the forumites to

understand why's and what's for-

be kind-

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

As others mentioned, no1 is willing to do the HW for you unless you post some of you works (3D) or at least image so you can get some advice from it

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

This is the problem, error that the program gives me

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Did your instructor give you this assignment without instruction on how to complete the assignment?

Is it too late to change schools?

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Hi, I have not had the willing to laugh but this message made me smile. It is really too late to change the school...My instructor has not teach us how to deal with this analysis. He just told that there are many instructions on Youtube..

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Therefore, I am just trying to learn the steps from these videos

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

I certainly hope you are not paying anything to attend such a school.  As an aside, what is the institution?  I just want to make sure our company never hires anyone from a school that tells you to go get your education on YouTube(TM).

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

James Riddell wrote:

I certainly hope you are not paying anything to attend such a school....

There is no such thing as a free ride.

If the student (or parents) are not paying for the school - the taxpayers certainly are.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Oh, I know that all too well.  Although when I was in KSA, the gov't paid for the school and paid the students to attend (oil \$s, go figure).  The instructors were conscientious and professional, however the students, not so much.  You can lead a camel to the Red Sea but you can't make them think.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

What should i do?

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Hi, My instructor has not teach us how to deal with this analysis. He just told that there are many instructions on Youtube..

Does this school have any open faculty positions?

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

J. Mather wrote:

Hi, My instructor has not teach us how to deal with this analysis. He just told that there are many instructions on Youtube..

Does this school have any open faculty positions?

If teaching consists of referring students to youtube videos I think I could do the job too.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Glenn Schroeder wrote:

If teaching consists of referring students to youtube videos I think I could do the job too.

In certain cases I refer students to specific YouTube videos that I have vetted, I then back the information with proper classroom instruction.  But I have seen too many instructors who don't have a clue about the subject matter of the class they are supposed to be teaching - turn over the responsibility to YouTube.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Somebody must give a Olympic title to Youtube ...

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

They should have at least gotten an Oscar by now.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Thank you Mr. Mather. I do not say that my instructor is not responsible of course but probably the ENGINEERING discipline part within the whole course is skipped in this way- by saying us to learn from Youtube...

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

I do not know if there are any open positions Mr. Mather. However, I really need help; I have done everything to finalize that work. Right now just one paper with this analysis is needed to finalize my thesis made of almost of 300 pages. I am a Design and Engineering student, as this school is in Italy actually we deal mostly with the Design part of the works. So, the engineering parts unfortunately are not strong enough to make us learn everything properly. I have learnt how to make that analysis; but the problem is that there is something with the program...and I can not solve that

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

...

Right now just one paper with this analysis is needed to finalize my thesis made of almost of 300 pages. ...

Can you ask your instructor to join this discussion? (Tip: This is a binary yes/no question.)

FEA is a complex topic - it takes me 5hrs/week for 16 weeks to introduce linear elastic static stress analysis.  Then another 32 weeks at 5hr/week to introduce dynamic stresses.

I suspect that "urgent help" will result in nothing more meaningful than pretty pictures.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Sorry, I probably skipped this your question. Yes, I have already sent an email to my instructor- still I could not receive an answer.

Usually, these topics (linear elastic stress analysis and dynamic stresses) are not included into our program. I mean- the instructors do not have lessons on these topics. The thing is that- my instructor with whom I work on my thesis work required from me to have the Finite Element analysis for my chair project.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

I even skipped that fact about not having a good instructor...Righ now I just need to understand why the meshing process /step does not work

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

That was a rhetorical question of course.  Any instructor who points willy-nilly to YT is most certainly not going to take the time to enter into this discussion.  But then, neither would I if it was just two days from the exam.  I'm just glad that students are just as predictable in their advance planning skills as they have been for centuries.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Engineering lesson 1: (Murphy's law: "Anything that can go wrong will go wrong")

Don't leave thing at the last moment.

Things will go wrong and you need to plan way ahead.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Hi, I have not had the willing to laugh but this message made me smile. It is really too late to change the school...My instructor has not teach us how to deal with this analysis. He just told that there are many instructions on Youtube..

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Hello,

just to give you a hint:

Go to "Evaluate" and find "Interference Detection". Every interference found, will result in an error when trying to mesh...

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

I sorted through the unhelpful posts and downloaded the files you attached in an attempt to help diagnose your issues, however there wasn't even a study within the assembly file at all. If you're looking for help with specific issues, you will need to try to create the study yourself and then ask questions about specific issues when you get stuck. We aren't going to create the complete study for you because if we did you wouldn't learn anything and we don't know the full problem statement.

A couple things to note from the error messages that you attached. If your parts are interfering to start with, which is typical with hardware, then it is best to fix the geometry or exclude the hardware from the study and simulate the bolted connection with the available tools in the Simulation add-in. Additionally, if the study says that you don't have a material assigned to a part, it's pretty easy to right click on the part in your simulation tree and apply the material to the offending part.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

He probably hadn't gotten to that part of the video.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Jim Wilkinson - Could you please help the OP - on your last day at SW, like just before you run out the door....

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Only for reference read some basic simulation book

Flow module

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Why would you analyze a chair to 450 LBS?

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

James Riddell wrote:

Why would you analyze a chair to 450 LBS?

Incase you haven't looked around America lately (even if he is in Italy) there are a lot of people over 300#. If you want any factor of safety.....

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

I was thinking safety factor, too.  I wonder what John Stoltzfus' company uses as a standard weight for a chair they make?

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Matt Peneguy - Safety factor.........

None - Zlich - Zero

We do offer a Lifetime Warranty on all of our Chairs and they hold up well, my guess is that when the seat gets buried when someone sits on our chairs and you can't see the seat, the person will get up and look for another chair, unless that's what they want.....

We use our 30 plus years of experience to produce one of the most robust chairs on the Market..

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

I used to live in furniture town in San Bernardino and learned from some designers that they used the factor of safety of 3 for their designs

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Matt Peneguy wrote:

I was thinking safety factor, too.

I think it might be worth pointing out that the term "safety factor" as typically used in FEA is a misnomer - it doesn't really mean what most people would think as a factor of safety.  It is not a measure of material fracture (as in - the chair will likely break if load exceeds a certain value).

For the OP:

FoS merely means the material in some location has stretched beyond elastic limit and entered plastic deformation.

What happens at/beyond that point is another complex discussion....

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Very good point.  Thank you for the clarification.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

That's a 1.5x proof load.  Just PPE if you ask me.  We have some customers who ask for a load factor (multiplier), Safety Factor, and then compare to an allowable (knocked-down) stress limit.  That's belt, suspenders (braces), duct tape, AND superglue.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

James Riddell wrote:

Why would you analyze a chair to 450 LBS?

I personally work with a guy who is in excess of 400 pounds.   He sits in a regular office chair........

I am 280 pounds myself.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

First: lose ALL the hardware; only RARELY do you run an FEA on a fastener.

Second: fix ALL of the remaining interferences (by any of the methods previously mentioned)

Third: defeature, supress, or remodel anything with too many (and too small) holes or fillets/chamfers, etc.

Fourth: ONLY after you have done all the above are you ready to start thinking about FEA. Then, do a LOT of thinking about loads, restraints, etc.

I would not even begin to try to analyze this assembly the way it is designed. It's a fool's errand.

You have 104 interferences to clean up, likely many will be corrected by the elimination of fasteners.

• ###### Re: URGENTLY! CAN SOMEONE MAKE THE FINITE ELEMENT ANALYSIS UNDER 2000N OF THAT CHAIR?

Oh, and get rid of all the ball bearings as well. Model them as a solid if you need to fill the space (and you DO need to fill the spaces).