This GeoApp estimates the stiffness for one constituent material, if the stiffness of the complete structure is known.

By clicking Edit… in the ElastoDict section of the main GeoDict GUI, the Stiffness Estimation Parameters dialog opens.

The result file name can be entered in Result File Name (*.gdr).

The target stiffness of the structure is set in Stiffness of the structure / (GPa).

Enter the ID number of the material for which the stiffness should be estimated in Estimate Stiffness for Material ID.

The stopping criteria is defined in Tolerance / (%). If the relative error for the estimated structure stiffness is smaller than the specified tolerance, the estimation stops.

Finally, the Compute Direction (X, Y or Z) for the stiffness and the Orientation Mode are defined in their drop-down menus. Refer to page 31 for more details. In this example, the stiffness in Z-Direction of material with ID 01 is estimated.

After all parameters are set, clicking OK closes the Stiffness Estimation Parameters dialog and the estimation is started by clicking Run.

The estimation result is documented among others in the Results tab of the Result Viewer. The table shown in the Report tab summarizes the GeoApp results: besides the target of the structure stiffness, which is defined by the user, the stiffness, which is reached in the fitting process, is shown.

In this example, the stiffness of the epoxy matrix (material ID00) of a composite structure is estimated. The table displayed in the Results - Report subtab shows that the estimated overall structure stiffness (Reached Stiffness) is 7.159 GPa and Estimated Stiffness for Material00, which is the stiffness for the epoxy matrix, is 4.429 GPa. The fitting process in this example took 3 iterations.