Thermal strain

[tuyet]

I would like to check the thermal strain due to thermal expansion in Feap by using command:

MATErial 1
  SOLID
    ELASTIC ISOTROPIC  2e9    0.3
    THERMAL ISOTROPIC  1.35e-5   25

with T=150 and T0=25

The thermal strain should be
    eps(1) = 1.35e-5*(T-T0) = 1.6875e-3
...

Unfortunately the results in Feap is 2.194e-3

Could you please explain me whether I have some problems with input so that I cannot get the correct results?

Thank you very much.

[FEAP_Admin]

For the problem you have solved the correct answer is:  eps =  (1+nu) * alpha * (T - To)
(Your input file is for plane strain.)

Thus I believe FEAP is giving the correct answer to the problem you are asking it to solve.

[tuyet]

Thank you very much.  You're is completely right.