MTS3000-Restan
Automatic system for measuring residual stresses
by the hole-drilling strain gage method
Automatic system for measuring residual stresses
by the hole-drilling strain gage method
The Ring-Core residual stress method is a semi-destructive method for residual stress measurements.
Unlike to the hole drilling method, the Ring-Core method needs to machine a core (external diameter of 18mm / internal diameter of 14mm) around a special strain gage rosette with 3 overlapped grids.
Compared with the hole drilling method, the ring-core method allows performing calculation of the residual stress up to higher depths (total depth of 4.0 – 5.0 mm) and it has a lower sensitivity to the eccentricity error.
For these reasons the Ring-Core method is generally suggested in the applications where the residual stress profile close to the surface is less interesting as for big forged parts.
Thanks to a long experience in residual stress measuring systems, SINT Technology has developed an automatic device for the determination of the residual stresses by the ring-core method.
The measurement chain is composed by:
The mechanical device of the RingCore system is developed to perform the following key-operations: