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kpsenthilkumar83
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Join Date: Jan 2012
Posts: 2

FEA Analysis/ASME Div 2

01/02/2012 11:59 PM

Can anybody help me to understand this?

1) I have a FEA analysis and the results are based on Von mises theory? Is the approach of the analysis is correct? ASME Div 2 is based on Tresca. What is the difference?

2) What is convergence in FEA and what shall be done to assure convergence?
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wijeesh
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Engineering Fields - Mechanical Engineering - New Member

Join Date: Apr 2008
Location: India
Posts: 25
#1

Re: FEA Analysis/ASME Div 2

01/03/2012 5:43 AM

Dear Mr Senthilkumar

Where in the code its saying that ASME is based on Tresca????

The von Mises theory is a little less conservative than the Tresca theory but in most cases there is little difference in their predictions of failure. Most experimental results tend to fall on or between these two theories.

Regards

vGsh

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 vgsh
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kpsenthilkumar83
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Join Date: Jan 2012
Posts: 2
#2
In reply to #1

Re: FEA Analysis/ASME Div 2

01/03/2012 6:38 AM

Sir,

Thank you for the reply.

Actually, the exchanger is designed per Div 1 and due to nozzle load the thickness of shell required is 40mm(SA 516 Gr.70), where PWHT has become mandatory per code. To avoid distortion of tubes because of PWHT, it was commented by Client to do FEA and reduce the thickness to 30 mm and the result of the FEA is indicated as Von-mises. Client has commented that Div 2 is not based on Von-mises but Tresca. I need to understand what is the basis of FEA and the differences in these theories.

Please clarify.
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