METHOD DETERMINING PARAMETERS OF GROWTH OF FATIGUE CRACK IN MEMBER OF STRUCTURE Russian patent published in 1997 - IPC

FIELD: nondestructive test of loading of members of structures. SUBSTANCE: parameters of growth of fatigue crack are determined by one dependence between equivalent coefficient of tension intensity and height of skewing cause by plastic deformation and length of crack. This dependence is found under cyclic loading of model of tested member under various asymmetries of cycle. When determining parameters of growth of fatigue crack in surface of undestructed member of structure where crack is detected distances between trace of crack and boundary of zone of plastic deformation distant from it and length of crack are measured simultaneously. Measured distance corresponds to height of skewing caused by plastic deformation with same length of crack. EFFECT: exclusion of necessity of destruction of member of structure after detection of crack in it. 4 dwg