Creep damage calculation along a semi-elliptical crack in a power plant component

Issue title: Special Issue: Proceedings of a Special Symposium in the Honor of David M.R. Taplin

Guest editors: Ashok Saxena and Toshimitsu Yokobori Jr.

Article type: Research Article

Authors: Lo Conte, Antonietta^a | Bassi, Federico^a; | Sant’Angelo, Giovanni Ignazio^a | Eliza Cristea, Mihaela^b

Affiliations: [a] Department of Mechanical Engineering, Politecnico di Milano, Italy | [b] Rede, Tenaris Dalmine, Italy

Correspondence: [*] Corresponding author. E-mail: federico.bassi@polimi.it

Abstract: A 3D finite element model, based on the combination of a creep model and a ductility exhaustion approach, is presented and validated on the basis of creep crack growth tests. The proposed model is used to characterize creep crack growth in a pressurized cylinder with an axial crack on the inside surface. A canoe shaped distribution of stress triaxiality, that directly affects the creep damage, is found and investigated. The damage evolution is observed at different crack tip locations, showing a dependence on the crack geometry and loading conditions.

Keywords: P91 steel, creep crack growth, creep damage, finite element

DOI: 10.3233/SFC-180225

Journal: Strength, Fracture and Complexity, vol. 11, no. 2-3, pp. 227-251, 2018