TWO-CRITERION FRACTURE DIAGRAM FOR A PENNY-SHAPED RING-LOADED CRACK.

A critical load (force) is estimated for a space with a penny-shaped crack in a case where a concentrated force acts on its faces along the circumference. It is shown that it is impossible to determine the ultimate force with the help of classical fracture criteria, so a structural strength criterion formulated for axisymmetric problems is used. A relationship between fracture toughness and crack size is investigated and a two-criteria fracture diagram is constructed. [ABSTRACT FROM AUTHOR]