Fracture mechanics characterisation of crack growth under creep conditions

Creep crack growth rates in the 32%-Ni-20%-Cr alloy Incoloy 800 H at 800 degrees C are correlated with the fracture mechanic parameter C integral. This was done by experimental and numerical investigations of different specimen sizes and geometries under constant load, constant rate of crack opening displacement or crosshead displacement, or slow cyclic loading. In the numerical simulations plane and three-dimensional finite element calculations have been performed without consideration of creep crack growth. (IWM)