This can be done in Workbench Mechanical using User Defined Results. Please do the following: 1. In the Details view of the Analysis settings branch, under Output Controls section, switch “Stress” to “YES” 2. After solving (if needed), under the Solution tree, insert a “User Defined Result” 3. In the Details of the “User Defined Results”, and under Expression, enter “ENERGYPOTENTIAL” 4. In the Details of the “User Defined Results”, and under “Mode” write the mode number. If strain energy density (rather than strain enegy) is desired, use “ENERGYPOTENTIAL/VOLUME” for the Expression in Step 3 instead.