11 Replies Latest reply on Mar 5, 2015 2:32 AM by Jared Conway

Static Analysis of C-Clamp

Jignesh M. Patel Mar 3, 2015 1:25 AM

Hello Friends,

I am trying to do static analysis of C-Clamp Assembly for 300 N load (vertical direction) on Jaw and keeping bottom face of clamp as fixed.

I do not have clear idea about Connections & components sets..analysis fails during meshing of "cap screw2" & screw rod1". Do not know why?

May be i forgot something about contacts or connections or may be due to screw..i don`t know..please help me to find von-misses stress for this assembly.

I can perform analysis of individual components except screw rod1.

material for C Frame is FG260 (= Ductile iron)

Rest of parts of AISI 1020

Message was edited by: Jignesh M Patel

Rod Probe.JPG 80.9 KB
Assem Probe.JPG 59.4 KB
Assemb FEA.JPG 118.1 KB
Von misses with yield strength.JPG 66.8 KB
Analysis of C Clamp.rar 5.8 MB
Assembly Loading.JPG 86.5 KB
IMG-20150301-WA0012.jpg 230.7 KB
IMG-20150301-WA0011.jpg 196.0 KB

Re: Static Analysis of C-Clamp

J. Mather Mar 1, 2015 7:47 AM (in response to Jignesh M. Patel)

Can you attach folder without using rar compression?

I don't think you would need many of those parts in the analysis (perhaps only the frame).
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- Re: Static Analysis of C-Clamp
  
  Jignesh M. Patel Mar 1, 2015 10:49 PM (in response to J. Mather)
  
  Sir,
  I already did FEA of C frame and it is success.. no issue with that.
  Problem encounters while doing FEA of Screw Rod due to threads on it.
  
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Re: Static Analysis of C-Clamp

Seckin Uslu Mar 1, 2015 2:55 PM (in response to Jignesh M. Patel)

The screw mesh generate many elements . You should suppress the cut sweep feature on screw part.

Like J. Mather said you dont need many of those parts.
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- Re: Static Analysis of C-Clamp
  
  Jignesh M. Patel Mar 1, 2015 10:56 PM (in response to Seckin Uslu)
  
  yes dear your are right.
  
  But after suppressing that feature (cut sweep) and considering plain rod and and find stress in rod as attached...but i am not sure this is right.
  
  Second thing i have consider cylinder body (shank) as fix end condition and applied load of 300 N at bottom end and got results shown in attachment.
  I also omitted handle and collar and pin from analysis..but due to screw rod and improper contact condition i am not able to carry out analysis in assembly mode.
  
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  - Re: Static Analysis of C-Clamp
    
    Mike Pogue Mar 1, 2015 11:42 PM (in response to Jignesh M. Patel)
    
    The von Mises stress plot attached looks correct. It also looks like you have a safety factor of 112.
    
    The boundary conditions you propose make sense, especially because the max stress is far from the fixed point. You simply don't need FEA to calculate the stress in the screw. It's F/A. Calculate it with a pencil. You have three conditions to check, shear in the threads (F/shear area, make sure you use shear strength as allowable), compressive stress in the screw (F/tensile stress area), and bearing between the screw and the end piece (F/projected area, you should be willing to let this yield a little--it's not going anywhere)
    
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    - Re: Static Analysis of C-Clamp
      
      Jignesh M. Patel Mar 2, 2015 12:57 AM (in response to Mike Pogue)
      
      Hi Mike your are right but i want to prove that using simulation..that is it.
      
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Re: Static Analysis of C-Clamp

Mike Pogue Mar 1, 2015 5:14 PM (in response to Jignesh M. Patel)

+1 for both comments.
Analyze the load on the frame using FEA as a single part. Ignore concentrations where the loads are applied
Analyze the compressive load in the screw by looking up the proof load, or the proof stress and the stress area.
Analyze the stress on the threads by looking up the thread shear area.
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Re: Static Analysis of C-Clamp

Jignesh M. Patel Mar 3, 2015 1:26 AM (in response to Jignesh M. Patel)

Friends please share your views on results i have achieved in assembly mode is it OK ?
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- Re: Static Analysis of C-Clamp
  
  Jared Conway Mar 3, 2015 8:46 PM (in response to Jignesh M. Patel)
  
  what do you mean are they ok?
  
  and what results specifically are you referencing?
  
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  - Re: Static Analysis of C-Clamp
    
    Jignesh M. Patel Mar 3, 2015 10:29 PM (in response to Jared Conway)
    
    I mean from load, fixture and importantly connection type between components that i have applied. results are consistent with my hand calculations.
    
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    - Re: Static Analysis of C-Clamp
      
      Jared Conway Mar 5, 2015 2:32 AM (in response to Jignesh M. Patel)
      
      only you can tell us that!
      but if they line up with your hand calculations, that is a good sign
      
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