Limiting values for Von Mises stress in concentric reducers?

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In summary, the person is seeking help with finding the limiting values of Von Mises stress and the minimum required thickness for ASME 1500 class concentric reducers. They mention having already designed the reducer and having FEA results, but are unsure how to compare the stresses in the simulation to the material properties and where reducers typically fail. They also mention the possibility of consulting a specialist for damage analysis. They question the need for additional information beyond the material limits and FEA results to answer their questions.
  • #1
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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  • #2
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.
 
  • #3
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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1. What is the significance of Von Mises stress in material testing?

Von Mises stress is a measure of the maximum equivalent stress that a material can withstand before it reaches its yield point. It takes into account all three principal stresses and is commonly used in material testing to determine the strength and ductility of a material.

2. How is the limiting value for Von Mises stress determined?

The limiting value for Von Mises stress is determined by performing tensile tests on a material and observing the stress-strain curve. The point at which the curve starts to flatten out is the yield point, and the corresponding stress value is the limiting value for Von Mises stress.

3. Can the limiting value for Von Mises stress be exceeded in real-world applications?

Yes, the limiting value for Von Mises stress is a theoretical value and can be exceeded in real-world applications due to factors such as material defects, stress concentrations, and environmental conditions. However, exceeding this value can lead to plastic deformation and failure of the material.

4. How does temperature affect the limiting value for Von Mises stress?

The limiting value for Von Mises stress is affected by temperature as it can cause changes in the material's mechanical properties. For example, at high temperatures, the material may experience creep which can lower its strength and increase the risk of exceeding the limiting value for Von Mises stress.

5. Is the limiting value for Von Mises stress the same for all materials?

No, the limiting value for Von Mises stress varies depending on the type of material and its composition. This value is influenced by factors such as the material's yield strength, ductility, and behavior under different loading conditions. Therefore, it is important to determine the specific limiting value for a particular material before using it in an application.

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