Barkhausen noise analysis

shot peening residual stress cover
April 4, 2018

Stresstech Bulletin 14: Shot Peening Residual Stresses

Cold working causes plastic deformation that creates residual stresses. The degree and sign of the residual stress depend on degree and type of the working process. Shot peening is a cold working process in which the surface of a component is peened with small spherical balls called shots. The process induces plastic deformation on the surface, relieves surface tensile stresses and introduces beneficial compressive residual stresses. Shot peening is a similar process with surface rolling, both deform the surface plastically to develop a compressive residual stress depth profile.

Illustration of the Bragg’s law which describes X-ray diffraction from crystal lattice planes.
March 7, 2018

Stresstech Bulletin 12: Measurement Methods of Residual Stresses

There are many methods to measure residual stresses. The methods are commonly grouped as non-destructive, semi-destructive and destructive or diffraction based, strain relaxation based and other methods. However, they all have the same common point: being indirect. There is no direct method available to measure stresses: they are calculated or derived from a measured quantity such as elastic strain or displacement.