Product Overview

How does it works

How does it works

Restan MTS3000 is an Automatic System for the Residual Stress Measurement by the Hole Drilling Method.

It has been developed and patented by SINT Technology.

 

Restan has a fully automatic process and automatic drilling. It ensure a high repeatability and a high speed drilling (400,000 rpm).

 

Main Features are:

  1. Automatic stepping motor control of drilling depth
  2. Automatic zero-depth detection
  3. Measurement of residual stress variation with the testing depth
  4. Choice of stress profile calculation methods
  5. Choice of residual stress calculation methods
  6. Fully compliant to the ASTM E837-13a standard
  7. High measuring accuracy

 

see full Brochures

The Hole Drilling Strain Gauge Method and the ASTM E837-13 STANDARD

The Hole Drilling Strain Gauge Method and the ASTM E837-13 STANDARD

MTS3000 works in accordance to the ASTM E837 standard.

The most recent version of the standard is dated 2013 and introduced some modifications and innovations to the calculation of the residual stress using the hole drilling method.

 

Some limitations connected with the type of strain gauge used, are still present, as well as the maximum allowable eccentricity error (0.02 mm) and the maximum stress level that can be measured (80% of the yield strength).

 

To calculate residual stress in compliant to the ASTM E837-13, SINT Technology has recently developed a new version of the EVAL software. It is also able to minimize the aforementioned limitations, thanks to the introduction of new coefficients and correction algorithms. 

  

The residual stress measurement by the hole drilling strain gauge method (HD - semi-destructive method) works by drilling a small hole in the centre of a 3 grid strain gauge rosette.

 

For each drilling step, the strains relaxed by the tested material, are acquired and used for calculating the residual stresses.

 

The HD method is standardized by ASTM E837, the last release of which is dated 2013.

The HD method defines:

  1. the distribution and number of the drilling steps,
  2. the sizes (diameter, grid length and width) of the strain gauge rosette
  3. the coefficients used for calculating residual stresses starting from the acquired strains.

 

see full Publications