Problem description

For the selected nodes and stress points for curves, PLAXIS will store all selected nodes and stress points by their node number and stress point number respectively in order to use these as references to gather the data for curves. These selections are stored in two categories:

• for nodes and stress points selected prior to calculation (pre-calc nodes);
• and for the nodes and stress points selected after the calculation (post-calc nodes).

When regenerating the mesh with a changed configuration (e.g. different coarseness, changes in geometry), the node numbers and stress point numbers at a given location will change, meaning that the stored node numbers and stress points are only valid for one mesh configuration.

The PLAXIS 2D AE program will reset the pre-calculation selected nodes to avoid incorrect node/stress point references, but unfortunately, it does not reset the post-calculation selected nodes and stress points in PLAXIS 2D AE.00 and PLAXIS 2D AE.01. This can lead to two problems:

1. the node number now refers to a different location in the mesh. This can be problematic when for example re-using the node in an existing graph: when choosing to regenerate the graph, the data is taken from a different coordinate, giving a different curve;
2. or, when the requested node number is no longer present in the mesh due to e.g. a coarser mesh, the curves wizard will still try to find this original node number. But since this number is not available anymore, the program will show a bug report.

Solution

This issue is now solved in PLAXIS 2D AE.02: when regenerating the mesh, the pre-calculation stress point and node list and the post-calculation node and stress point list will be cleared.

In PLAXIS 2D AE.00 and PLAXIS 2D AE.01, the above mentioned problems could be solved:

1. When regenerating curves for a remeshed model, please make sure to check the coordinates of the post-calculation selected node/stress point. If these are not correct, make sure to re-select the correct post-calculation node/stress point and then use the re-selected nodes/stress points to recreate the curve;
2. When the program presents a bug report when trying to generate a curve, this could be solved by removing these post-calculation selected nodes and stress points, and re-select the correct nodes and stress points. The removal of the existing selected nodes and stress points can be done by these two methods:
   • Click on the select points for curves button in the Output program, and then remove the post-calculation selected nodes and stress points from the list. The pre-calculation selected nodes and stress points are named to by a letter (e.g. A for the first node), while the post-calculation selected nodes and stress points are just named by their node number or stress point number:
     
   • Alternatively, you can delete the file containing all the data for the post-calculation selected nodes and stress points. This data is stored in a file called data.nsl, and when removing this file from the PLAXIS 2D AE data folder (folder name ends with *.p2dxdat), it should be possible again to generate a new curve. These post-calculation selected nodes and stress points then need to be reselected when they are required for a curve.