Limiting values for Von Mises stress in concentric reducers?

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SUMMARY

The discussion focuses on determining the limiting values of Von Mises stress in concentric reducers, specifically for a design using WPHY65 material with a yield strength of 450 MPa and a minimum tensile strength of 535 MPa. Key questions include the failure pressure of the reducer and the minimum required thickness for ASME 1500 class rating fittings. The burst pressure value is noted as 76.8 MPa. Participants emphasize the importance of comparing FEA results with material limits to assess failure points and suggest consulting a specialist for fracture-related issues.

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  • Understanding of Von Mises stress and its significance in material failure analysis
  • Familiarity with Finite Element Analysis (FEA) and its application in engineering design
  • Knowledge of ASME standards, particularly ASME 1500 class ratings
  • Basic material properties of WPHY65, including yield and tensile strength
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  • Research methods for calculating limiting values of Von Mises stress in engineering materials
  • Learn about the failure modes of concentric reducers under pressure
  • Investigate the process for determining minimum thickness requirements for ASME fittings
  • Explore advanced FEA techniques for accurate meshing and fracture analysis
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Mechanical engineers, structural analysts, and professionals involved in the design and analysis of pressure vessels and piping systems, particularly those working with ASME standards and FEA simulations.

31mikey01
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Hi there was wondering if anybody could help me.

1). How to find the limiting values of Von Mises stress induced in concentric reducers?
2). At what pressure concentric reducer will fail?
3). Calculation for thickness (minimum required for fittings) for ASME 1500 class rating.

Material properties:

WPHY65
Yeild = 450Mpa
Min. Tensile Strength = 535Mpa


Burst pressure value: 76.8Mpa

These questions have been forwarded to me after I had designed the reducer and created and FEA Results report. So asking for help with the above 3 questions.

Thanks
 
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Since you already have the FEA results, can't you just compare the von Mises stresses in the simulation to fy/sqrt(3)? Do you know where to look? Where do reducers usually fail when they fail? If it is a fracture problem, then you have to be careful in meshing your part, and you might want to consult a specialist in that sort of damage.
 
I don't understand. Aren't these the questions you answer in your report. I do in mine. You have the material limits and the resultant stresses from the FEA. These are all you need really to answer those or are we missing something?
 
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