Thanks to a long experience of more than 20 years in laboratory & field hole drilling measurements, SINT Technology has developed, produced and optimized an AUTOMATIC system for the determination of the residual stresses by the hole-drilling method.
The measurement chain of the MTS3000-Restan system is composed by:
a mechanical device with micrometric advancement controlled by a dedicated stepper motor including a suitable drilling device (based on air turbine or electric motor) for the material under test and a dedicated microscope for centering the device with the centre of the strain gage rosette
an electronic control unit for the control of the system, in particular the drilling speed, the activation of the drilling motor and the execution of zero-depth determination by electric contact (Zero-setting);
a control software (RSM) dedicated to the measurement setup, strain acquisition and drilled hole measurements;
an evaluation software (EVAL) for the calculation of the residual stress using different methods (ASTM E837, Integral. Differential and HDM) starting from the acquired strains, including corrections and uncertainty evaluation.
Key features of the system
The MTS3000-Restan has a fully automatic process and drilling. It ensures a high repeatability and avoids any induced residual stress by an optimization of the drilling parameters.
The main features are:
Suitable for laboratory and on field measurements
Available in different configurations
Applicable on many materials such as metals, polymers and composites
Automatic control of drilling depth by micrometric stepping motor
Automatic zero-depth detection
Measurement of residual stress variation with the testing depth