Comparative study of differentmethods to estimate crack resistance curves from fracture tests using numerical crack growth simulation techniques
Faculty of Applied Engineering Sciences
Engineering sciences. Technology
Proceedings of the 15th European Conference of Fracture (ECF15) : Advanced Fracture Mechanics for Life and Safety Assessments, Stockholm, August 11-13, 2004
Different methods to estimate the instantaneous crack length and the crack resistance curve, respectively, from a single specimen fracture test are discussed. The Node-Release-Technique and a ductile damage model were used to simulate ductile crack growth in C(T) specimens under plane strain conditions. Three hypothetical materials have been considered, where the parameters related to material model and crack growth simulation technique were chosen in order to obtain three similar load versus displacement responses. It is shown that similar load displacement results may correspond to different crack growth behaviour and the capa- bility of different methods to estimate the instantaneous crack length to distinguish between these different cases is discussed. The resistance curves predicted by the different estimation schemes are compared with the corresponding results of the numerical simulations.