HyperView supports RMS von Mises Stress and von Mises Stress results for Random response analysis. The output variable “MISES-Mises stress based on segalman(s)” is the von Mises Stress and “RMISES-RMS of Mises stress based on Segalman(s)” is the RMS von Mises Stress output. To calculate the MISES and RMISES output stress value at element level is needed. So in random response analysis the stress output must be requested in the preceding frequency step. These data’s stored in the odb file is extracted in the reader and the actual computation is done based on work by Segalman, et al. (1998).

is the Mises stress calculated based on Segalman, et al. (1998), , is the PSD matrix containing all the frequency related term and , is the stress output for a particular node b.

Where and represent the stress components for and  mode at a given node b and A is a constant matrix. The RMS von mises at a node b is calculated using the following equation:

Limitation: The calculation time can be high for big models. In this case, results can be extracted in batch mode using HVTrans.