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.
- Pressure Vessels and Piping Division
Computational Modelling of High Temperature Steady State Crack Growth Using a Damage-Based Approach
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Yatomi, M, O’Dowd, NP, & Nikbin, KM. "Computational Modelling of High Temperature Steady State Crack Growth Using a Damage-Based Approach." Proceedings of the ASME 2003 Pressure Vessels and Piping Conference. Application of Fracture Mechanics in Failure Assessment. Cleveland, Ohio, USA. July 20–24, 2003. pp. 5-12. ASME. https://doi.org/10.1115/PVP2003-2002
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