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It is true that the model unit is always mm/mg/ms in AUTODYN, whatever the units of system is used in Explicit STR. I would suggest you to do the followings: 1. Delete the existing AUTODYN system in your model. 2. Drag and Drop a new AUTODYN system to Explicit Dynamics system. Then right click on SETUP cell in the AUTODYN system and click on UPDATE to import the model from Explicit Dynamics system to AUTODYN system. 3. After AUTODYN starts, look at the model to make sure all of the parts are imported and the geometric dimensions are correct. 4. Click on MATERIALS on the left navigation bar. If all of the materials were retrieved from Explicit Material Library in Explicit STR, you could skip the next step and go directly to Step 6. 5. If you have user-defined materials in your model, you can either manually modify the material property data after the change of the system units, or create a user-defined material library to store the material data and then retrieve the materials after the change of the system units. The latter will automatically convert the material property data to the new system units. To create a new user-defined material library, click on SAVE in the dialog panel of MATERIALS, enter the name of the library, and then select the material to save it into the library. 6. Now change the units of system under pull-down menu SETUP -> Descriptions. 7. Rename the existing materials to xxx_old and then retrieve these materials from material library, including the user-defined material library. You should find that the material property data are converted automatically to the new units of system. 8. To retrieve user-defined materials, click on LIBRARY in the dialog panel of MATERIALS to browse to the library and then click on LOAD to retrieve the material. 9. Next click on PARTS, select one part at a time, click on ZONING -> TRANSFORMATION -> SCALE to scale the part dimension from the old length unit to the new length unit. For example, if the old unit of length is mm and the new unit of length is cm, you need to enter 0.1 to all of X/Y/Z directions to scale the part dimension from mm to cm. You should scale all parts. 10. Finally, select each part, click on FILL -> BLOCK to fill each part with the new retrieved materials. You may need to create an initial condition to fill explosive materials. You should fill every part in your model with the new materials. 11. Save the project. The conversion of system units is completed.