Stress Analysis

RecurDyn/RFlex uses the stress shape and modal coordinate to recover the stress time history. RecurDyn/RFlex provides two different methods to calculate the stress shape matrix. One method is to use the displacement mode shape matrix to generate the strain shape matrix and the other method is to import the stress shape matrix directly from FE Softwares.

Figure 1  Concept of Stress recovery

Stress and strain recovery using stress and strain shape matrix doesn’t support for the beam type elements. But, following beam elements can be shown the stress and strain results. The stress and strain recovery are used the FFlex Beam stress and strain recovery function. In order to calculate stress and strain, all Beam related information is written in the RFI file. Therefore, the RFI should be made by MakeRFI or RFlexGen function in V9R3 or later versions.