Using combined experiments and analysis to generate dynamic critical stress intensity data

In this paper, we give a short description of a finite element model of mixed-mode dynamic crack propagation. We then discuss the use of combined experiment/analysis procedures to generate critical stress intensity data as a function of crack velocity. Because of the sensitivity of the analysis to boundary conditions and specified crack velocity, it is difficult to generate reliable K/sub ID/(v) data using this approach. This is due to uncertainties in both the analysis and measured crack position. Suggestions are made for alternate test methods to reduce some of these uncertainties.