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.
crack driving force, JR curve, numerical
solution, limit pressure values