Some tips on design for durability:

Stress Analysis

In Finite Element Analysis, look at the maximum principal stresses as well as the von Mises equivalent stresses.

Life Assessment

Analytical life assessment does not replace durability testing; it supplements testing.

Analytical life assessment requires durability test data as input.

Notches

Dependence of fatigue strength on tensile strength and, for pulsating tension, on mean stress is minimal in the presence of sharp notches and an innocuous environment.

Change the stresses, not the materials

Connections

Fit-up and sound welding procedures are vital to ensure adequate durability of weldments.

Preloading of mechanical fasteners is vital to the durability of a mechanically-fastened joint.

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