Discussion Forum

Hello,

I'm trying to better understand the workings of the solid mechanics module, and I came across an apparent discrepancy between the documentation and the module itself.

The momentum balance equation in the module itself (Solid Mechanics -> Equation) for a stationary solution is:

,

but according to the documentation, the correct equation is:

.

I feel like I must be missing something simple here. Does the solver assume that the strain is small, and therefore ? Or is there maybe one of the gradients in terms of the materials frame and one is not?

Cheers, Adam