Computing stiffness in Orthotropic material in a Mutliphysics

Hello everyone,

I just started using COMSOL Multiphysics, and I am impressed by the software and the website. I tried to compute stiffness in an isotropic material, and the results were satisfying. I also got some help from the blog: https://www.comsol.com/blogs/computing-stiffness-linear-elastic-structures-part-2/

Now, I am trying to compute the stiffness of orthotropic material which is PZT-2 in my case. I am getting results that are half the expected value. Can anyone please tell me why this is happening and how can I get an expected result.

Thanks.