License File and Usage

The BioRID-2 v4.0.1 is distributed with a license file which uses an expiry date. The license file is sent to the user with the whole dummy package. Different license files are necessary for different systems of units.

In the license file, all load curves are encrypted. There are parameters defined which can be used to offset the numbering of the load curves. The load curves can be scaled by using parameters which are encrypted in the normal BioRID input. The names of the parameters refer to the table or load curve ID of each material. So if the values of the table ID 1002 are to be scaled then the parameter s1002 must be used.

The principle structure is as follows:

Input data in the BioRID-2 license file:

*PARAMETER
$ Load Curve offset
I lcoff           0

$ Load Curve scale values
R sTABID         1.0
             .
             .
             .

Input of the license file:

*PARAMETER_EXPRESSION
I   lcTABID    TABID + &lcoff
R eTABID    1.0 * &sTABID

*DEFINE_CURVE
&lcTABID           0       1.0&eTABID            0.0        0.0
          <Values_x>          <Values_y>
             .
             .
             .

The license file has to be included in the dummy model main file AFTER the parameter block. LS-DYNA has to first read the BioRID parameters and then the PARAMETER_EXPRESSION in the license file. Otherwise LS-DYNA will terminate with an error because of missing parameters.

We recommend storing the license file of dummy models in a central place as read only. Furthermore the name of the license include should be simple, like for instance

Biorid_v4.0_license.asc

With a symbolic link from the current license to this name it is possible to keep older input decks running without updating the input data contained in them. As you may notice this description differs from the one in older model manuals. Since the release of LS-DYNA 971 R6.0 there was a slight change in the parameter reading routine. If you locate the license file as explained above, the model will run in former LS-DYNA releases as well.

The expiry date, the owner of the license and the system of units are printed out in the d3hsp file of LS-DYNA. The name of the license file also includes the company name and the expiry date of the dummy.

For the work in a pre-processor, an additional file is delivered:

BioRID-2_v4.0_all_units_load_curves_work.key

This work file includes the same input as the encrypted license file. The only difference is the scaling of the load curves in the work file. The load curves are scaled randomly in a wrong range and they are much too soft to be used for a LS_DYNA simulation. But the file can be used to observe the quality and course of the material curves.

A LS-DYNA simulation in use of the work file will give wrong results and is very unstable.