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Volumetric Swelling
Posted Oct 6, 2009, 1:32 p.m. EDT 2 Replies
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Hello,
I am trying to increase the volume of a material as a function of temperature, this cannot be included in the thermal expansion coefficient as in this case a reduction in temperature does not cause the volume to reduce by the same amount it had increased. Any advice would be appriciated.
Thank you kindly.
I am trying to increase the volume of a material as a function of temperature, this cannot be included in the thermal expansion coefficient as in this case a reduction in temperature does not cause the volume to reduce by the same amount it had increased. Any advice would be appriciated.
Thank you kindly.
2 Replies Last Post Oct 7, 2009, 9:38 a.m. EDT
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Posted:
2 decades ago
Hi
it depends what you are trying to do, I'm not sure I get it correct, but if you do not use the thermal expansion "alpha", with a little care you can use it for a non linear "swelling" by defining a function and set your alpha (normal material expansion) to this function. This is the way the material detabase define non-linear material.
There are quite some text in the help/documentation about interpolated data functions
Does it help ? Hope so
Good luck
Ivar
it depends what you are trying to do, I'm not sure I get it correct, but if you do not use the thermal expansion "alpha", with a little care you can use it for a non linear "swelling" by defining a function and set your alpha (normal material expansion) to this function. This is the way the material detabase define non-linear material.
There are quite some text in the help/documentation about interpolated data functions
Does it help ? Hope so
Good luck
Ivar
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Posted:
2 decades ago
Hello,
I did consider including this swelling in my expansion coefficient, but I would have to include logical statements, which would change the equation dependent on some other variable I have in my model.
e.g.
alpha = (if stage=1 then a + b*T + c*T^2, if stage=2 then d+ e*T + f*T^2)
this is to ensure the volume does not decrease with temperature, the same way it increased, giving a hysterisis graph of material swelling.
I did consider including this swelling in my expansion coefficient, but I would have to include logical statements, which would change the equation dependent on some other variable I have in my model.
e.g.
alpha = (if stage=1 then a + b*T + c*T^2, if stage=2 then d+ e*T + f*T^2)
this is to ensure the volume does not decrease with temperature, the same way it increased, giving a hysterisis graph of material swelling.