Now suppose that there is another file and we want to create a link between two files.

Previously we defined stress. In that definition we could come up with a formula for stress transformation.

What is stress $\boldsymbol{\sigma}$ or $[\sigma]$? Stress is force $\mathbf{F}$ divided by area $A$. In other words, it is force normalized by the applied area.

Similary strain is normalized displacement.