Evaluate Strength Results dialog box

Response Element
Select Element	Lets you select one or more elements on the model to evaluate.
Element Labels	Lets you add elements to the selection.Use a space or comma to separate your entries.Use a colon or a dash to add a range of element labels.For example, enter 1:10 or 1-10 to add all the element labels from 1 to 10.Use colons to add an incremented range of element labels.For example, enter:1:9:2 to add element labels 1, 3, 5, 7, 9.1:10:2 to add element labels 1, 3, 5, 7, 9, 10.10:1:-2 to add element labels 10, 8, 6, 4, 2, 1.Press Enter or click Select to add your entries.To edit your selection, click Edit Element Selection .
Elemental Data Location
Beam Element	If you are evaluating stress or strain for beam elements, select the stress recovery point on the beam cross section where you want to recover response results. The letters C, D, E, and F correspond to the four stress recovery points on a typical beam section. For more information about stress recovery points, see the description of PBEAML in the Simcenter Nastran Quick Reference Guide.
Shell Element Layer	For shell elements, select the region over which the stress and strain should be calculated: Top or Bottom.
Location	Lets you specify the evaluation location as only the element centroid, corner points, or both centroid and corner points.
Stress Properties
Stress Criteria	Available only for Transient and Quasi-Static events.The method (Von Mises, Maximum Principal or Minimum Principal stresses) used in determining the strength failure index for the requested elements. The software uses the maximum values of effective stress in the time history.Note: For other event types, the software always uses von Mises:For Frequency events, the software uses the maximum amplitudes of von Mises stress in the given frequency range.For Random events, the software uses nσ (n times RMS) values of Von Mises stress.For Response Spectrum events, the software uses the peak value of von Mises stress.
Stress Option	The method for calculating and storing the strength results:Node on Element — Stores results for every node on the selected elements.Element Maximum — Stores only the most conservative strength results for each selected element.
Evaluation Settings
Appears only for Response Spectrum and DDAM events.
Evaluation Method	The rule for calculating the peak values by combining the peak response of each mode and each excitation. Of the evaluation types, ABS, SRSS, and NRL use the same combination rule for multiple excitations. If you choose CQC or NRC_Double_Sum, you must also select either ABS or SRSS in the Multi-Excitation Combination Method box.ABS — Absolute Value rule.SRSS — Square Root of the Sum of the Squares rule.NRL — Naval Research Lab method.CQC — Complete Quadratic Combination rule. To combine responses to multiple excitations using the CQC rule, you can select ABS or SRSS in the Multi-Excitation Combination Method box.NRC_DOUBLE_SUM — Nuclear Regulatory Commission rule, double-sum method. Used for modal models with closely spaced natural frequencies. To combine responses to multiple excitations using the NRC rule, you can select ABS or SRSS in the Multi-Excitation Combination Method.For more information about each of these methods, see Response spectrum analysis.
NRL Neighboring Factor	Available when Evaluation Method is set to NRL, for Response Spectrum or DDAM events.If you set this value to 1.0, no neighboring modes are used to compute the NRL Method peak modal response. If you set this value to 1.1, and a peak modal response is at 100 Hz, modes in the range of 90.9 to 110 Hz (that is, +/- 10 percent of the peak modal frequency) are included in the peak modal response calculation. The larger the NRL factor, the larger the range from which neighboring modes are selected. The lower the factor, the smaller the range from which neighboring modes are selected.
Combination Method	Available when Evaluation Method is set to CQC and NRC_DOUBLE_SUM, for Response Spectrum events.Lets you combine responses to multiple excitations. Choose either ABS or SRSS.
NRC Double Sum Time Duration	Available when Evaluation Method is set to NRC_DOUBLE_SUM, for Response Spectrum events. Enter the duration of the excitation.
Material Properties
Ultimate Safety/Yield Safety	The method the software uses to normalize the maximum stress in the event, using either the Ultimate Strength or Yield Strength values defined in each element's material properties.
Override Material Properties	Overrides the individual element material properties and lets you define a global normalization value.
Ultimate Strength	Available when Override Material Properties is selected. This value normalizes the maximum stress in the event, overriding the Ultimate Strength values defined in each element's material properties.
Yield Strength	Available when Override Material Properties is selected. This value normalizes the yield stress in the event, overriding the Yield Strength value defined in each element's material properties.
Number of Standard Deviations	Available for Random events.The number of standard deviations from the zero-mean standard deviation (root mean square (RMS) value). The system multiplies this number by the RMS value to determine the strength failure index results.The RMS value calculated from a response PSD function designates the standard deviation of the random process when its mean value is zero. Because the statistical distribution of the response may not be obvious, the RMS value cannot be used to predict the exact confidence level of the structure's behavior in response to the given random excitation. The default value of 3.0 is commonly used as a good engineering measure for random analysis.
Description
Description	A description of the evaluation. This text appears in the Description column in the Simulation Navigator for the results generated by this evaluation. This description is useful for keeping track of several sets of results. For example, if you perform three Strength evaluations, you should use a description, because the three results sets will appear in the navigator with the same “Strength” name.
Preview
Show Result	Displays a preview of the results as a contour plot.

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Evaluate Strength Results dialog box, Simcenter 3D 2021.1 Series

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