Understanding the strength evaluation

The strength evaluation of your structural model lets you view the following sets of results:

• Strength safety factor (SSF)

• Margin of safety (MS)

Isotropic strength evaluation

For isotropic materials, the strength safety factor is calculated as follows:

SSF = max [Stress criterion / max(Stress(ti))]

where max(Stress(ti)) is the effective stress for any time ti and the stress criterion is either the ultimate strength or the yield strength.

Stress-strain curve	Stress Strain Elastic region Plastic region Fracture Yield strength Ultimate strength

The effective stress can be one of the following:

• Von Mises

• Tresca

• Maximum Principal

• Minimum Principal

For isotropic materials, the margin of safety is calculated as follows:

MS = (SSF/FS - 1) x 100 %

where FS is a specified factor of safety.

The strength safety factor and margin of safety results indicate whether the part will instantaneously fail due to structural loading. If SSF values are less than 1.0 or MS values are negative, structural loading alone will cause the part to fail. No further fatigue evaluation is necessary, and a redesign is recommended.

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Static events

Transient events

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Introduction to durability analysis

Strength calculations for orthotropic failure criteria

Fatigue evaluation on element free faces

Fatigue life criteria

Biaxial fatigue evaluation on element free faces

Using a notch factor for modeling the local plastic behavior

Understanding cyclic stress-strain behavior

Understanding the fatigue safety evaluation

Cumulative damage

Random fatigue methods

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Strain gage transverse corrections for rosette legs

Scientific literature references for durability

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Understanding the strength evaluation, Simcenter 3D 2021.1 Series

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