The Notch Effect

ndt, NDT

Notches - Defects in Design and their Consequences

Notches are responsible for much damage in many components. A notch produces local stress concentrations points at the 'notch' tip and promotes the formation of service, fatique and stress corrosion cracks.

At the same time, a notch can produce a three (3) dimensional state of tensile stress that restricts the plastic deformability and favors 'cleavage' fracture.

The stresses can then stretch elastically the 'lattice' of the material and promote hydrogen embrittlement.

Fatigue fractures can be initiated by these notches.

So don't forget to smooth those edges and remove those undercuts.

 

 

 

 

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