The strain-life approach

The strain-life approach was developed in the early 1960s as an alternative to the stress-life approach for determining fatigue damage, particularly when yielding occurs at critical locations of a component. The basic idea of the strain-life approach is that on most useful engineering components, locations of stress concentration, or notches, exist at which the local stress state may be above the yield stress of the material, even if most of the surrounding material remains elastic.

Because of the elastic material surrounding the yielded material, the deformation of the yielded material is restricted resulting in strain-controlled elastic-plastic deformation at the notch. The notches, in turn, serve as critical locations for fatigue cracks to initiate because of the higher stresses and strains at these locations.

Therefore, the fatigue behavior of a material can be related to strain-controlled material property tests (see the following figure).

Strain Control

Data Flow for the Strain-Life Approach

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Local stress-strain behavior

Constant amplitude life curves

Endurance limit and static failure

Determining material properties

Mean stress and damage parameters

Axial versus torsion tests

Notch analysis

The strain-life analysis in Specialist Durability

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