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# net (cumulative) strain on external walls - pressure housing

Creator

Hi, In related to a discussion I have started on this topic a couple of weeks back, Internally Pressurized Housing - Post Processing , here is another question I am hoping to get some answers.

I modelled the housing with axisymmetric 2D elements in order to investigate the strain on the OD (along the "tube section"). I was able to pick the nodes using curve on the OD of the tube section and plot/import all the strain values for applied internal pressure of 20 ksi. Image below shows the axial strain plot along the tube section on the OD. Similarly I can grab the Azimuth and radial strains for the outer elements.

But really what I am mostly interested to know is "the net external strain on the elements (on OD)". in other words, the net change in circumference/radius due to pressure. Is there a way I could accomplish this? I have attached the model for reference.

Thank you.

Ajinka

6 REPLIES

# Re: net (cumulative) strain on external walls - pressure housing

Creator
After reading more, I think that the hoop strain on the OD is the cumulative (total)? the one that measures the change in circumference.!!?
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# Re: net (cumulative) strain on external walls - pressure housing

Valued Contributor

If I have understood correctly what do you need, you have to plot the total displacement and you will give the change in diameter!

Best Regards

AMinati

# Re: net (cumulative) strain on external walls - pressure housing

Creator

Hi AMinati, Thank you. That should give me the change in diameter /circumference.

Regards,

Ajinka

# Re: net (cumulative) strain on external walls - pressure housing

Creator

The material tensile strengh is 40 kpsi (Yiled is probably just over half). The Von Mises stress on the ID is about 36 kpsi. Should I be worried? Can someone please enlighten me. Thank you.

# Re: net (cumulative) strain on external walls - pressure housing

Valued Contributor

"To plot stress I use the FEMAP Stress Linearization Tool (see Femap forum) to analyse stress according to ASME Section VIII Division 2"

Dont worry, be happy)

Creator

Thank you