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# Custom expansion in ANSYS

## Custom expansion in ANSYS

(OP)
Hello there!
I would like to make a simulation of radiation-induced volumetric expansion of minerals by showing development of stresses in ANSYS. I have a function which describes swelling and a model of polycrystalline rock, my guess is that I should somehow modify built-in tools like thermal expansion and make it develop by my function. My question is how do you simulate default expansion? Are there any related sources?

### RE: Custom expansion in ANSYS

By default expansion I assume you mean the thermal expansion due to a temperature rise. Think of the thermal expansion coefficient as a general expansion coefficient. The coefficient with have two terms, a thermal term and a radiation swelling term. The thermal term is equal to alpx. Use your swelling function to calculate a swelling strain. Then determine the swelling coefficient as follows: εswellswellxΔT →αswellswell/ΔT. Add alpx to αswell to get the general expansion coefficient. If the temperature and radiation are uniform over the entire model, this is a hand calculation. Otherwise you have to make the calculation on an element basis and create a unique material for each element. This is easy to do with some APDL. If the model is large, you will need to use vector operations (*VGET, *VOPER, *VFUN,etc) and implied loops to speed things up.

Rick Fischer
Principal Engineer
Argonne National Laboratory

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