Von Mises on Nozzle

[lcmechengr]

I am analyzing a nozzle by determining the Von Mises effective stress. From a piping analysis program, I have been provided with Axial, Bending, Torsional, and Hoop Stresses. My plan was to determine the uniaxial tensile stresses from the bending and torsional stresses using Von Mises and by treating the nozzle as a two dimensional stress state. I would then add the axial stress to come up with the overall axial stress acting on the nozzle. Does this sound like the correct approach? Even though the hoop stresses do not act in the axial direction of the nozzles, do they need to considered? Thanks for any input.

 

[rb1957]

this sounds like a student problem (how to determine von Mises given a bunch of stress components) ...

anyways i'd consider the torsion stress to be shear, the axial and the bending are direct stresses in one direction [assuming that the axial and bending stress align], and the hoop is the direct stress in the other direction.

my may need to "fuss" with the flexural shear stress component (but i don't think you have enough information). you may need to "fuss" with poisson effects too (even in 2D)

 

[ThetaJC]

Go to engspreadsheets.com... download 3-D State of Stress and it will calculate the equivalent Von-mises stress given a full 3D state of stress.

ThetaJC
Founder of

http://www.engspreadsheets.com

your source of no cost, professional grade spreadsheets.