Plastic Deformations of Previous Load Situations

New Add-on Module RF-LOAD-HISTORY

25. June 2014

The RF-LOAD-HISTORY add-on modules for RFEM considers permanent (plastic) deformations of previous load states. In this way, you are able to determine, for example, the deformation that remains after a structure is relieved. Moreover, with a corresponding definition of the load steps, it is possible to find out the load for which the used material starts to plastify.

With RF-LOAD-HISTORY, it is possible to calculate structural systems consisting of surfaces and solids.

Functionality of RF-LOAD-HISTORY

Once the entire model and loading is defined in RFEM, you can enter the load steps and their descriptions in RF-LOAD-HISTORY. Then, you assign the load cases or load and result combinations to the different load steps. You have the option to multiply them by a load factor.

The calculation is carried out successively for each load step. Permanent (plastic) deformations of previous load steps are considered when calculating further load steps. The loads of the individual steps are added up (depending on the signs) throughout the calculation process.

The method of analysis can be freely selected (linear static, second-order, large deformation, and postcritical analysis). Furthermore, you can control the global settings of the calculation via the add‑on module.

After the successful calculation you can see the results of the individual load steps directly displayed in the tables of the add-on module. You can also evaluate them graphically on the structural model. The results output includes for example deformations, stresses and internal forces of surfaces as well as deformations and stresses of solids.

The result combinations for each load step can be exported to RFEM. These enveloping combinations can be used for further designs in other RFEM add-on modules.

All input data and results of the add-on module are part of the RFEM printout report.

For calculations carried out in RF-LOAD-HISTORY the add-on module RF-MAT NL (considering nonlinear material laws) is required.

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