Fatigue evaluation on element free faces

You can choose one of the three approaches for evaluating fatigue on element free faces. Depending on the approach you choose, the durability solver follows different steps for fatigue evaluation.

Principal axes approach

The durability solver first determines the "effective" principal axes on each element free face using the statistical distribution of the orientation of the principal axes. It then uses either uniaxial or biaxial loading assumptions to calculate fatigue results.

The durability solver assumes that the normal stresses to the element faces are small and do not affect the fatigue life. The fatigue life and damage are calculated using only the in-plane stress or strain history on element faces.

This approach is best for the long stress/strain history with many cycles.

Maximum damage approach

The durability solver calculates the uniaxial or biaxial damage using the stress or strain history in different directions on element faces. The highest damage is used as the damage of the element face and its direction is treated as the effective loading direction.

The durability solver assumes that the normal stresses to the element faces are small and do not affect the fatigue life. The fatigue life and damage are calculated using only the in-plane stress or strain history on element faces.

Critical plane approach

The durability solver calculates the uniaxial or biaxial damage using the stress or strain history in the principal directions on the critical (maximum shearing) plane determined by the maximum shear strain at the center of each element face.

This approach is best for the short stress/strain history with very few cycles.

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Analyzing strain gage rosette data

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Principal axes approach

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Fatigue evaluation on element free faces, Simcenter 3D 2021.1 Series

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