Material properties for durability analysis

Durability properties are a special class of material properties that are necessary for durability analysis. The following tables list when the durability material properties are required. Blank cells indicate where the durability property is not used.

Isotropic material properties

All properties are located on the Durability page of the Isotropic Material dialog box except Yield Strength and Ultimate Tensile Strength, which are on the Strength page.

Durability material property	Structural strength analysis requirements	Fatigue strength analysis requirements	Fatigue life analysis requirements
Fatigue life criteria	Mean stress effects	Cyclic stress-strain conversion
Yield Strength, Sy	Required.	N.A	N.A	Required by the Soderberg method.	N.A
Ultimate Tensile Strength, Su	Required.	Required by the Goodman and Gerber methods.	N.A	Required by the Goodman and Gerber methods.	N.A
Fatigue Strength Coefficient, σ'f	N.A	N.A	Required for the following fatigue life criteria:Smith-Watson-TopperMaximum principal strain lifeMaximum shear strain lifeStress lifeFor stress life, you can use user-defined S-N curves instead of the fatigue strength coefficient and exponent.For maximum principal strain life and maximum shear strain life, you can use user-defined E-N curves instead of the fatigue strength coefficient and exponent and the fatigue ductility coefficient and exponent.The fatigue strength coefficient and exponent are required for random fatigue event analysis if you do not use user-defined S-N curves.	Required by the Morrow method.	N.A
Fatigue Strength Exponent, b	N.A	N.A	N.A	N.A
User-defined S-N curve	N.A	N.A	Required for stress life and random fatigue event analysis, if you do not use the fatigue strength coefficient and exponent.	N.A	N.A
Fatigue Ductility Coefficient, ε'fFatigue Ductility Exponent, c	N.A	N.A	Required for the following fatigue life criteria:Smith-Watson-TopperMaximum principal strain lifeMaximum shear strain lifeFor maximum principal strain life and maximum shear strain life, you can use user-defined E-N curves instead of the fatigue strength coefficient and exponent and the fatigue ductility coefficient and exponent.	N.A	N.A
User-defined E-N curve	N.A	N.A	Required for maximum principal strain life and maximum shear strain life, if you do not use the fatigue ductility coefficient and exponent.	N.A	N.A
Cyclic Yield Strength, σ0	N.A	N.A	N.A	N.A	Required for the Ramberg-Osgood and power hardening models.
Cyclic Strength Coefficient, H	N.A	N.A	N.A	N.A	Used by the Ramberg-Osgood and power hardening models.If the specified material does not have the cyclic strength coefficient defined, a message is displayed and the cyclic strength coefficient is set to 1012.
Cyclic Strain Hardening Exponent, n	N.A	N.A	N.A	N.A	Used by the power hardening model.If the specified material does not have the cyclic strain hardening coefficient defined, a message is displayed and the cyclic strain hardening coefficient is set to 10-5.
Fatigue Limit Strength in Bending, σflFatigue Limit Strength in Torsion, τfl	N.A	Required by the Dang Van method.	N.A	N.A	N.A

Orthotropic material properties

The following properties are located on the Strength page of the Orthotropic Material dialog box.

Durability material property	Structural strength analysis requirements	Fatigue strength analysis requirements	Fatigue life analysis requirements
Ultimate Tensile – 1, XuUltimate Tensile – 2, YuUltimate Tensile – 12, Su	N.A	Required.	N.A
Tsai-Wu Interaction Coefficient (F12), F12Tsai-Wu Interaction Coefficient (F13), F13Tsai-Wu Interaction Coefficient (F23), F23	Used by the Tsai-Wu failure criterion.If the specified material does not have the Tsai-Wu coefficient defined, it is set to 0.The Tsai-Wu coefficients F13 and F23 are used for solid composites that are defined with the PCOMPS bulk entry for use with composite ply failure theories.
Tension (ST1), XT_staticTension (ST2), YT_staticCompression (SC1), XC_staticCompression (SC2), YC_staticShear (SS12), Sstatic	Required.	N.A	Required.

The following properties are located on the Durability page of the Orthotropic Material dialog box.

Durability material property	Structural strength analysis requirements	Fatigue strength analysis requirements	Fatigue life analysis requirements
Fatigue Strength Coefficient – 1, X0Fatigue Strength Coefficient – 2, Y0Fatigue Strength Coefficient – 12, S0Fatigue Strength Exponent – 1, bxFatigue Strength Exponent – 2, byFatigue Strength Exponent – 12, bs	N.A	N.A	Required if you do not use user-defined S-N curves.
User-defined S-N curves	N.A	N.A	Required if you do not use the fatigue strength coefficients and exponents.

Laminate support

The software ignores elements that have plies with material type set to Ply Materials or that reference PCOMP physical properties. Only Laminate physical property is supported.

I-deas durability material library

The I-deas durability material library includes materials for which the durability properties are predefined.

The material properties are derived from the SAE J1099 1975 and SAE J1099 1998 materials specifications. A detailed material description can be found in the SAE specification. The name of an I-deas durability material consists of the SAE Material Name and the Brinell Hardness Number (BHN) separated by the forward slash (/).

Example:

In the material named 304/160 (SAEJ1099, FEB. 1975), 304 is the SAE Material Name and 160 is the BHN.

The BHN is added to distinguish materials that have the same name.

You can access these materials using the site or user MatML libraries. The library is stored in the AdvancedDurabilityMaterialsLibraryMetric.xml file in the [software_installation]/NXCAE_EXTRAS/advanceddurability folder.

How do I

Define an S-N curve for isotropic materials

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Analyzing strain gage rosette data

Durability damage evaluation

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Material properties for durability analysis, Simcenter 3D 2021.1 Series

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