Abstract
In this work a computational study of creep crack growth in a carbon manganese steel is presented. The constitutive behaviour of the steel is described by a power law creep model and the accumulation of creep damage is accounted for through the use of a well-established model for void growth in creeping materials. Two dimensional finite element analyses have been performed for a compact tension specimen and it has been found that the predicted crack growth rate under plane strain conditions approaches that under plane stress conditions at high C* levels. Furthermore it has been shown, both experimentally and numerically, that an increase in test temperature causes the convergence of the cracking rate to occur at higher values of C*. This trend may be explained by the influence of crack-tip plasticity, which reduces the relative difference in constraint between plane stress and plane strain conditions. The constraint effect has been quantified through the use of a two-parameter characterisation of the crack tip fields under creep conditions.
Original language | English |
---|---|
Pages (from-to) | 5-12 |
Number of pages | 8 |
Journal | American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP |
Volume | 462 |
DOIs | |
Publication status | Published - 2003 |
Externally published | Yes |
Event | 2003 ASME Pressure Vessels and Piping Conference - Cleveland, OH, United States Duration: 20 Jul 2003 → 24 Jul 2003 |