difference in simulated stress and strain

Hi,

I simulated stress for a 2D Silicon structure using "thermal stress" in COMSOL, the simulated stress values are quite consistent with my experimental results.

however, when I look at the simulation results in strain by typing "ts.eX" in the expression, the strain values do not make sense to me and they are not consistent with the simulated stress values. The strain values are much lower than the expected values that I converted from stress using Young's modulus.

I just entered value for the Young's modulus and Poison's ration for Silicon, and typed "ts.eX" in the expression instead of "ts.sx" when I look at the results in stress. Is there any other thing that I need to enter for the simulator to calculate the strain correctly?

Thanks!