pressure deformation linear relationship in a vessel

CRI_CFD · February 4, 2020, 07:35

I have a question regarding pressure vessels.

I obtained the deformation of a vessel for a given internal pressure (in fact I have to consider plasticity of the material, I used multilinear kinematic hardening)

If I use a lower internal pressure, can I establish any kind of linear relation between pressure and deformation based on my previous computation?

I guess that this has no sense in my case. But let us imagine a situation of a linear elastic analysis (Hook's law). If I compute stress for a given load (let's say a pressure of 500 bar) and later I do the same with another pressure (for example 250 bar), then I will be able to obtain a linear relation between pressure and stress in my structure, and the same applies with deformation, isn't it?

Thanks in advance

evcelica · February 19, 2020, 07:38

If you are using linear material properties, and linear geometry (Large deformation set to off) then everything will be linear.

February 4, 2020, 07:35	pressure deformation linear relationship in a vessel	#1
CRI_CFD Member Richardpluff Join Date: May 2014 Posts: 95 Rep Power: 11	I have a question regarding pressure vessels. I obtained the deformation of a vessel for a given internal pressure (in fact I have to consider plasticity of the material, I used multilinear kinematic hardening) If I use a lower internal pressure, can I establish any kind of linear relation between pressure and deformation based on my previous computation? I guess that this has no sense in my case. But let us imagine a situation of a linear elastic analysis (Hook's law). If I compute stress for a given load (let's say a pressure of 500 bar) and later I do the same with another pressure (for example 250 bar), then I will be able to obtain a linear relation between pressure and stress in my structure, and the same applies with deformation, isn't it? Thanks in advance

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February 19, 2020, 07:38		#2
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	If you are using linear material properties, and linear geometry (Large deformation set to off) then everything will be linear.