Vol.3, No1, 2003, pp. 3-10
UDC 669.14-434.1:539.42

LIMIT PRESSURE VALUES FOR INTERNALLY PRESSURIZED

CRACKED CYLINDERS

Miodrag Kirić 1

Aleksandar Sedmak 2

1 HIP Azotara Pančevo, KKOM, Pančevo, Serbia and Montenegro

2 Faculty of Mechanical Engineering, University of Belgrade, Serbia and Montenegro

Abstract

By applying EPRI engineering approach, limit pressure values for internally pressurized long cylinder with an axial crack are estimated. The JR curve and crack driving force are approximated by polynomials in terms of crack growth a – ao and crack length a. It is shown the effect of cylinder geometry on internal pressure pi corresponding to the onset of crack growth as well on internal pressure pf for system instability. The apparent material toughness and the relative change of pressure pi for different wall thicknesses increase with the stable crack growth. It is shown that the relative stable crack growth is greater than the value allowed by the ASTM E-399.

Keywords: crack driving force, JR curve, numerical solution, limit pressure values

full article (423 kB)