ASTM e837

ASTM E837 (“Standard Test Method for Determining Residual Stresses by the Hole-Drilling Strain-Gage Method”) is the only complete standard on residual stresses available in the world. The last version was published at the end of 2013, with several changes and improvements.

ASTM E837-13 standard specifies a complete hole-drilling procedure for determining residual stress profiles near the surface of an isotropic linearly elastic material; the stresses may remain approximately constant with depth (case of “uniform” stress distribution) or they may vary significantly with depth (case of “non-uniform” stress distribution).

With the strength of many years of experience in the fields of strain gauge measurements and in programming and mechanical design engineering, SINT Technology has developed and patented a system for measuring residual stress (RESTAN – MTS3000), that is unique in his kind because of its fully automated process. It’s also fully compliant to the ASTM E837-13 standard.
The RESTAN (REsidual STress ANalyzer) system is able to perform residual stress tests using hole drilling method, and to process the acquired data by the new calculation software EVAL 7 with four stress calculation systems as listed below:

• Standard ASTM E837-13, uniform stress distribution
• Standard ASTM E837-13, non-uniform stress distribution
• Kockelmann method
• Integral method, in accordance with G.S. Schajer.

As written above, the ASTM E837 standard is the only standard concerning residual stress measurement. The other calculation methods cover all possible test conditions and, together with the ASTM E837 standard, perform an excellent data calculation support.

Moreover, the new calculation software EVAL 7 provides additional features, improved calculation algorithms and a new theoretical model (HDM) with correction of eccentricity andlocal plasticity errors.