METHOD OF PART STATE ESTIMATION Russian patent published in 2014 - IPC G01N23/00 

FIELD: instrumentation.

SUBSTANCE: proposed method comprises obtaining X-ray picture of the part to reveal residual compression strain therefrom and determining the control criterion to be compared with limiting value. Note here that for estimation of multi-cycle fatigue as a control criterion, parameter of strained state for strain concentrator is used. The latter is defined as relationship between residual compression strain at maximum intensity point and residual compression strain at lower intensity point of stain concentrator. Then, strained state parameter is compared with maximum magnitude for this type of strain concentrator obtained experimentally. Note here that the part is returned to operation in case strained state parameter exceeds maximum magnitude in strain concentrator. Or said part is subjected to further analysis in case said parameter equals or is lower that maximum magnitude and part in strain concentrator exists at limit state at the stage of flaw formation. Nearby strain concentrator, said parameter is defined as relation between residual compression strain at higher intensity point and residual compression strain at lower intensity point on the surface nearby said concentrator. Obtained value is compared with limiting magnitude obtained experimentally. Note here that the part is returned to operation in case strained state parameter is smaller than maximum magnitude nearby strain concentrator or said part is subjected to further analysis in case said parameter exceeds or equals maximum magnitude, that is the part exists at limit state nearby strain concentrator.

EFFECT: possibility to estimate part state in strain concentrators or at surfaces nearby them.

5 dwg