METHOD OF TESTING FOR STRENGTH OF A DISC OF A TURBOMACHINE, HAVING CONCENTRATORS OF STRESSES IN THE FORM OF HOLES, AND A DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2020 - IPC G01M13/00 G01N3/32 

FIELD: turbomachine building.

SUBSTANCE: invention relates to turbomachine building, particularly, to testing of turbomachines discs having strength concentrators in form of holes, as well as to devices for its implementation. Essence: in a turbomachine disk imitation model having a through hole, imitating through hole for a coupling bolt in a full-size turbo machine disc, performing initial radial incision from contour of through hole of imitation model of turbo-machine disc towards its center, with diametrically opposite cut of the through hole side, a radial cut of the imitation model of the turbomachine disk is made to its edge and loaded along the normal to the notch plane. Initial cut from contour of through hole of imitation model of turbo-machine disc towards its center is blind and has a semi-elliptical shape, and loading is applied in the form of repeating cyclic stretching stepwise increasing loads, numerical values of which and moments of transition to the next load stage are determined in advance using calculation method. Simulation model comprises through hole, imitating through hole for coupling bolt in full-size disc of turbomachine, with made from contour of through hole of imitation model of turbo-machine disc towards its center initial radial notch simulating initial surface crack, and with diametrically opposite notch of through hole – radial cut simulation model turbo machine wheel to edge. Initial notch from the outline of the through hole of the imitation model of the disk of the turbomachine in the direction to its center is made with a blind half-elliptical shape.

EFFECT: possibility of more accurately simulating operating conditions of turbomachine disk with allowance for elastoplastic deformation condition occurring in stress concentration zone.

6 cl, 4 dwg