NUMERICALLY MODELING TENSILE TESTS OF PLATES WITH A LATTERAL NOTCH
The applicability of the modified Gurson - Tvergaard - Niedelman (GTNm) model to computations is considered; in the frame of numerical modeling, the model makes it possible to obtain failure surfaces, realized in experiments with samples, which include scroll-type surfaces. Tests on static tension of plates (prismatic samples) with a herringbone lateral notch, which initiates the nucleation of a crack, have been modeled using the computer. This type of tests is included into the normative documents of the “Gazprom” JSC with the view of preventing propagation of extended viscous failure in gas mains. Specimens are made of a K65 strength class 1420 mm-diameter tube with a 27.7 mm-thick wall.