What's the difference among .step, .ach and .fem?

[marlonsaveri]

 I start doing tutorials of Autodesk Simulation Multiphysics. Sometimes, it ask me to ope a .ach file; sometimes, .step file, etc. So, what's the difference among them?

[S.LI]

.step only includes CAD information.

After importing .step file into FemEditor, you can get .fem file and several others, in which there are more FEA information involved.

A typical ASIM model includes one .fem file and one .ds_data folder, such as myModel.fem and myModel.ds_data.

.fem file contains most of model information, but not all.

In order to pack all necessary information together, you need a .ach file, which is an archive file in zip format.