A novel crack propagation rate model based on a two-parameter approach for electron beam welded joint of nickel-based superalloys

Fatigue crack propagation tests were carried out on Nimonic 80A electron beam welded joints with different stress ratio using standard CT specimens. The crack propagation rate was characterised using the ‘[Formula: see text]’ method, the ‘[Formula: see text]’ method and the ‘[Formula: see text]’ two-parameter method. Subsequently, a new crack propagation rate model is proposed, and its accuracy is verified by co-simulation using Abaqus and Franc 3D. The new model can better describe the crack propagation rate under different stress ratio.