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Conventional stress concentration (Kt) mitigation techniques of placing a circular fillet radius as a transitional profile within a geometric discontinuity (eg, shoulder) offers partial mitigation of the stress magnitude. Increasing the fillet radius is not consistent with minimum stress concentrations. There exist a minimum Kt for an optimum radius, above or below which, will generate a higher value of stress concentration, If the radius is larger than the optimum will unnecessarily increase component weight (Tranxuan, 1994).

The stress concentration is dependent upon surface geometry and is influenced by component aspect ratio, material stiffness and loadcase. Generally, circular fillets can be optimised (eg Peterson, 1974) to a single applied directional loadcase. A dissimilar loadcase will produce a different magnitude of Kt.

One method to reduce stress concentrations is to use a scaleable stress reduction profile (SRP).

Stress Reduction profiles (SRP).

This profile is very useful when profile height and width need to be adjusted to suit part geometry requirements. This means that height and base profile width can be varied. Yet this profile exhibits a stress reduction distribution along the length of the profile which has its minimum stress magnitude at its base.

Kt Elimination Software: EDGE

Kt-Elim Image

Run my Copy of EDGE

Our SRP program is called EDGE. For a desired X and Y dimensions, EDGE will generate a set of x and y coodinates that should provide a profile form that exhibits no stress concentration but a stress reduction distribution for single loadcase only.

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Document Downloads:

Kt-Elim Software Description