We provide the stress measurement service using XRD and BHD technologies.
Residual stress is considered as the "digital mark" of metallic components and their technological history.
XRD (X Ray Diffraction)
The XRD technique uses the diffraction of X-rays on metallic materials. It is an analytical and versatile technique with which it is possible to study the structural characteristics of materials. Metallic materials are made up of crystals whose atoms occupy ordered positions in the lattice structure. By projecting an X-ray beam on the surface of the component, it will penetrate a few microns and depending on the stress state of the component, it will reflect in a particular way. By means of a suitable mathematical analysis, the value of the residual stress of the surface of the component is obtained.
BHD (Blind Hole Drilling)
The BHD technique uses a strain gauge inside which a calibrated hole is made. In the vicinity of the hole, the residual stress of the material is relaxed. The gauges detect the deformation of the hole caused by the relaxation of the stress and with the appropriate mathematical calculation it is translated into residual stress values due to the theory of elasticity. It is a mini-destructive technique due to a hole of Ø 2mm approx and a depth of 1-2 mm. The advantage of the BHD is that it can be applied to any material, even non-metallic ones. It can be used in addition to XRD to obtain profiles of residual stress with high exploration depths.