Main strain gage methods used for measuring residual stresses include the Ring Core Method.
Ring Core method consists in drilling a core (approx. D = 18mm, d = 14 mm, h = 4-5 mm) around a special 3-element strain rosette. The core changes the initial strain allowing redistribution of the residual stresses originally existing in the material. The alternative best method is the Hole drilling strain gage method, that consists in drilling a small hole (approx. 1.8 mm x 2.0 mm) into the centre of a special 3-element strain rosette.
The test procedure used for measurement of residual stresses by the ring-core method with the MTS3000 – RingCore system follows these steps:
To get the perfect measurement, the previous step is repeated to reach a minimum depth of 4 mm. To analyze the test results, the Eval –RC post-processing software is used. It allows to read correctly all the test data and to choose among different calculation options.
Access to all our download resources