This paper presents a comparison between the life predictions from a physically-based damage mechanics formulation, which captures the fracture mechanism of intergranular cavitation, via three state variables, describing intergranular creep cavitation, coarsening of carbide precipitates and primary creep softening, and a corresponding single-damage mechanics formulation, of the Kachanov-type. The comparison is made for a 0.5Cr0.5Mo0.25V ferritic steel at a temperature of 635°C across a range of stress levels on the basis of a notched bar stress-state. Simplified predictions based on the R5 reference stress method are also given for comparative purposes.
- Pressure Vessels and Piping
A Comparative Study of a Single Damage-Parameter Life Prediction Method and a Physically-Based Damage Mechanics Method
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Leen, SB, Hyde, TH, Peravali, S, & Sun, W. "A Comparative Study of a Single Damage-Parameter Life Prediction Method and a Physically-Based Damage Mechanics Method." Proceedings of the ASME 2008 Pressure Vessels and Piping Conference. Volume 6: Materials and Fabrication, Parts A and B. Chicago, Illinois, USA. July 27–31, 2008. pp. 1195-1200. ASME. https://doi.org/10.1115/PVP2008-61386
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