Strength results

Use the Evaluate Strength Results dialog box to identify the regions of the model that are under-designed or over-designed. You can evaluate strength for beam, rod, shell, solid, axisymmetric shell, and axisymmetric solid elements.

Strength failure index

The strength results are real scalar results of the strength failure index. Its calculation is based on the effective stress divided by the ultimate strength or yield strength:

• Ultimate strengthStrength = Maxi [Stress(ti)/Ultimate strength]

• Yield strengthStrength = Maxi [Stress(ti)/Yield strength]

where Stress(ti) is the effective stress at time ti.

Note:

Alternatively, you can use the Override Material Properties option to apply an override value and normalize the maximum stress in the event.

Use the Stress Criteria option to specify how to calculate the effective stress. You can select Von Mises, Maximum Principal, or Minimum Principal (for Transient and Quasi-Static events). For other event types, Von Mises stress is used:

Event type	Stress data used
TransientQuasi-Static	Maximum values of effective stress (von Mises, maximum or minimum principal stresses) in the time history
Frequency	Maximum amplitudes of von Mises stress in the given frequency range
Random	nσ (n times RMS) values of von Mises stress, where n is the Number of Standard Deviation value
Response SpectrumDDAM	Peak value of von Mises stress

Evaluating the results

For a design to be feasible, the strength failure index must be a value between 0 and 1.

• An area where the strength failure index approaches 0 may be overly designed for this particular event. In most cases, you do not need to consider the area. The stresses in these areas do not approach the desired allowable limit.

• An area where the strength failure index approaches or exceeds 1 may not be able to withstand the event stresses within this area.

Note:

This index is reported in the Post-Processing Navigator under the heading Strength Safety Factor.

Example strength contour plot

Where do I find it?

• Choose Response Dynamics tab→Response Dynamics group→Evaluate Strength Results .

• Simulation Navigator→right-click the event node→Evaluate Contour Results→Strength

How do I

Evaluate strength results

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Strength results, Simcenter 3D 2021.1 Series

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